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program to copy a string to another using pointer passed to function

using codeblocks
--------------------------------------------------------------------------------------------------------------
//program to copy a string to another using pointer passed to function// program title
#include <stdio.h>                   //header file
#include <string.h>                   // header file to handle string
void string_length(char [],char[]);    // function prototype with character array
int main()
{
    char string[50],string1[50];            // character string
    puts("enter string1 and string2\n");
    gets(string);              //gets string
    gets(string1);
    string_length(string,string1);     //calling of function with string as parameter
                               // here, string is passed  as reference to formal parameter
    return 0;
}
void string_length(char *strings,char *strings1)// this accepts string with address from main function
{
     puts(strings);
     puts(strings1);
     printf("after copying\n");
     strcpy(strings,strings1);        // copies string
     puts(strings);          //displays string
}
//note: we can also use char string[] with void string_length in body line. It works.
//once you try.It runs.
//but we can not pass string as pointer in prototype.
// i.e. void string_length(char *[]);
--------------------------------------------------------------------------------------------
using turboc++
------------------------------------------------------------------------------------------
//program to copy a string to another using pointer passed to function// program title
#include <stdio.h>                   //header file
#include <string.h>                   // header file to handle string
#include<conio.h>
void string_length(char [],char[]);    // function prototype with character array
int main()
{
    char string[50],string1[50];            // character string
    puts("enter string1 and string2\n");
    gets(string);              //gets string
    gets(string1);
    string_length(string,string1);     //calling of function with string as parameter
                               // here, string is passed  as reference to formal parameter
getch();    
return 0;
}
void string_length(char *strings,char *strings1)// this accepts string with address from main function
{
     puts(strings);
     puts(strings1);
     printf("after copying\n");
     strcpy(strings,strings1);        // copies string
     puts(strings);          //displays string
}
//note: we can also use char string[] with void string_length in body line. It works.
//once you try.It runs.
//but we can not pass string as pointer in prototype.
// i.e. void string_length(char *[]);

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program to reverse a string using pointer. Pass pointer to function.

using codeblocks
-----------------------------------------------------------------------------------------------------
//program to find reverse of string using pointer passed to function// program title
#include <stdio.h>                   //header file
#include <string.h>                   // header file to handle string
void string_length(char []);    // function prototype with character array
int main()
{
    char string[50];            // character string
    puts("enter string\n");
    gets(string);              //gets string
    string_length(string);     //calling of function with string as parameter
                               // here, string is passed  as reference to formal parameter
    return 0;
}
void string_length(char *strings)// this accepts string with address
{
     strrev(strings);        // supplies length
     puts(strings);          //displays string
}
//note: we can also use char string[] with void string_length in body line. It works.
//once you try.It runs.
//but we can not pass string as pointer in prototype.
// i.e. void string_length(char *[]);
---------------------------------------------------------------------------------------

using turboC++
------------------------------------------------------------------------------------------------
//program to find reverse of string using pointer passed to function// program title
#include <stdio.h>                   //header file
#include <string.h>                   // header file to handle string
#include<conio.h>
void string_length(char []);    // function prototype with character array
int main()
{
    char string[50];            // character string
    puts("enter string\n");
    gets(string);              //gets string
    string_length(string);     //calling of function with string as parameter
                               // here, string is passed  as reference to formal parameter
   getch();
    return 0;
}
void string_length(char *strings)// this accepts string with address
{
     strrev(strings);        // supplies length
     puts(strings);          //displays string
}
//note: we can also use char string[] with void string_length in body line. It works.
//once you try.It runs.
//but we can not pass string as pointer in prototype.
// i.e. void string_length(char *[]);

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program to get length of a string using pointer

using codeblocks
----------------------------------------------------------------------------------------------------------
//program to find length of string using pointer passed to function// program title
#include <stdio.h>                   //header file
#include <string.h>                   // header file to handle string
void string_length(char []);    // function prototype with character array.compiler supports this. You                                                      //can also write char string[50].
int main()
{
    char string[50];            // character string
    puts("enter string\n");
    gets(string);              //gets string
    string_length(string);     //calling of function with string as parameter
                               // here, string is passed  as reference to formal parameter
    return 0;
}
void string_length(char *strings)// this accepts string with address
{
   int length;
   length=strlen(strings);        // supplies length
   printf("total length=%d\n",length);//displays length
}

//note: we can also use char string[] with void string_length in body line. It works.
//once you try.It runs.
//but we can not pass string as pointer in prototype.
// i.e. void string_length(char *[]);

------------------------------------------------------------------------------------------------------
using turbo c++
-----------------------------------------------------------------------------------------------------
//program to find length of string using pointer passed to function// program title
#include <stdio.h>                   //header file
#include <string.h>                   // header file to handle string
#include<conio.h>
void string_length(char []);     // function prototype with character array.compiler supports this. You                                                      //can also write char string[50].

int main()
{
    char string[50];            // character string
    puts("enter string\n");
    gets(string);              //gets string
    string_length(string);     //calling of function with string as parameter
                               // here, string is passed  as reference to formal parameter
   getch();
    return 0;
}
void string_length(char *strings)// this accepts string with address
{
   int length;
   length=strlen(strings);        // supplies length
   printf("total length=%d\n",length);//displays length
}

//note: we can also use char string[] with void string_length in body line. It works.
//once you try.It runs.
//but we can not pass string as pointer in prototype.
// i.e. void string_length(char *[]);


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Program to understand pointer passed to function.

using codeblocks
----------------------------------------------------------------------------------------------
//program to pick the greatest number using pointer passed to function
#include <stdio.h>            //header file
void max_number(int a[],int *);
int main()
{
    int a[100];                 //array declaration
    int i;
    int total;                   //variables declaration
    printf("enter value of total\n");
    scanf("%d",&total);              //input of total value of array
    printf("enter elements of array\n");
    for(i=0;i<total;i++)                   //execution of loop
    {
        printf("enter value for location=%d\t",i);
        scanf("%d",a+i);                  //input of element using array. here array acts as pointer.
                                          //It gets input using address starting from location 0.
    }
    max_number(a,&total);                //calling the function with passing of array and pointer
    return 0;
}
void max_number(int a[],int*p)
{
    int i,max;
    max=*(a+0);                          //It stores value stored in location 0

    for(i=0;i<*p;i++)                    //value of pointer being used
    {
       if(max<*(a+i))                   //comparison takes place
       {
         max=*(a+i);                    //assigning value
       }
    }
    printf("max value=%d",max);       //display of maximum value

}

----------------------------------------------------------------------------------------------------------
using turbo c++
------------------------------------------------------------------------------------------------------------------
//program to pick the greatest number using pointer passed to function
#include <stdio.h>            //header file
#include<conio.h>
void max_number(int a[],int *);
int main()
{
    int a[100];                 //array declaration
    int i;
    int total;                   //variables declaration
    printf("enter value of total\n");
    scanf("%d",&total);              //input of total value of array
    printf("enter elements of array\n");
    for(i=0;i<total;i++)                   //execution of loop
    {
        printf("enter value for location=%d\t",i);
        scanf("%d",a+i);                  //input of element using array. here array acts as pointer.
                                          //It gets input using address starting from location 0.
    }
    max_number(a,&total);                //calling the function with passing of array and pointer
   getch();
    return 0;
}
void max_number(int a[],int*p)
{
    int i,max;
    max=*(a+0);                          //It stores value stored in location 0

    for(i=0;i<*p;i++)                    //value of pointer being used
    {
       if(max<*(a+i))                   //comparison takes place
       {
         max=*(a+i);                    //assigning value
       }
    }
    printf("max value=%d",max);       //display of maximum value

}

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program to count total number of words,space,consonants in a string using pointer

using codeblocks
-----------------------------------------------------------------------

//program to reverse a string using pointer//comment of program
#include <stdio.h>                         //header file
#include<ctype.h>
int main()                              //main function
{
    char name[40];                     //character declaration
    char *p;                          //pointer declaration.
    int length,vowel=0,conso=0,space=0,words=1;
    puts("enter string\n");           //display of message
    gets(name);                      // gets data/string
    length=strlen(name);             //stores length of string
    p=name+length;        // assigning total address as in given string; it becomes total taken from variable length starting from 0.
                      //p=name takes address location 0 to pointer.
    while(p>=name)                 //the value of 'p' decreases from location 15 until it reaches 0.
    {
        if(*p==' ')                 //prints the value stored in particular location
        {
            space++;
        }

        else if(tolower(*p)=='a' ||tolower(*p)=='e' || tolower(*p)=='i' || tolower(*p)=='o' || tolower(*p)=='u')
        {
            vowel++;
        }
        else if(tolower(*p)!='a' ||tolower(*p)!='e' || tolower(*p)!='i' ||
                tolower(*p)!='o' || tolower(*p)!='u' ||
                *p!=' ' || *p!='.')
        {
            conso++;
        }
        p--;
    }
    printf("total vowel=%d,total consonants=%d,total spaces=%d,total words=%d",vowel,conso,space,space+1);
    return 0;
}

----------------------------------------------------------------------------------------------------------
using turbo c++
----------------------------------------------------------------------------------------------------
//program to reverse a string using pointer//comment of program
#include <stdio.h>                         //header file
#include<ctype.h>
#include<conio.h>
int main()                              //main function
{
    char name[40];                     //character declaration
    char *p;                          //pointer declaration.
    int length,vowel=0,conso=0,space=0,words=1;
    puts("enter string\n");           //display of message
    gets(name);                      // gets data/string
    length=strlen(name);             //stores length of string
    p=name+length;        // assigning total address as in given string; it becomes total taken from variable length starting from 0.
                      //p=name takes address location 0 to pointer.
    while(p>=name)                 //the value of 'p' decreases from location 15 until it reaches 0.
    {
        if(*p==' ')                 //prints the value stored in particular location
        {
            space++;
        }

        else if(tolower(*p)=='a' ||tolower(*p)=='e' || tolower(*p)=='i' || tolower(*p)=='o' || tolower(*p)=='u')
        {
            vowel++;
        }
        else if(tolower(*p)!='a' ||tolower(*p)!='e' || tolower(*p)!='i' ||
                tolower(*p)!='o' || tolower(*p)!='u' ||
                *p!=' ' || *p!='.')
        {
            conso++;
        }
        p--;
    }
    printf("total vowel=%d,total consonants=%d,total spaces=%d,total words=%d",vowel,conso,space,space+1);
getch();    
return 0;
}

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program to understand pointer's pointer

using codeblocks
----------------------------------------------------------------------------------
//understanding pointer's pointer
#include <stdio.h>

int main()
{
    int **p,*p1;                  //two pointer declaration
    int x=5;
    p1=&x;                        //stores address of x to pointer p1
    printf("first address p1=%d\n",p);//prints that first address
    p=&p1;                         //stores address of pointer by pointer
    printf("address p=%d\n",p);//prints that pointer's address
    return 0;
}
--------------------------------------------------------------------------------

using turboc++
----------------------------------------------------------------------------

//understanding pointer's pointer
#include <stdio.h>
#include <conio.h>

int main()
{
    int **p,*p1;                  //two pointer declaration
    int x=5;
    p1=&x;                        //stores address of x to pointer p1
    printf("first address p1=%d\n",p);//prints that first address
    p=&p1;                         //stores address of pointer by pointer
    printf("address p=%d\n",p);//prints that pointer's address
   getch();
    return 0;
}


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Program to find sum and average of 10 numbers using pointer.

using codeblocks
--------------------------------------------------------------------
//program to print sum and average of 10 numbers using pointer. //comment of program
#include <stdio.h>            //header file
int main()                   //main function
{
    int *p;                   //pointer declaration
    int a[20],i,k,sum=0;          //variable declaration
    int total;
    printf("enter total number\n");
    scanf("%d",&total);            // gets total value of array.
    p=a;                       //stores base address
    for(i=0;i<total;i++)      //runs from 0 to one less than total
    {
        scanf("%d",p+i);   //gets value for given address. This input goes upto last value of address
        sum=sum+*(p+i);   // finds sum
    }
    printf("the sum=%d\n",sum);          // prints sum
    printf("the average =%f\n",(float)sum/total);//prints average
    return 0;
}

--------------------------------------------------------------------------
using turbo c++
------------------------------------------------------------------------------------
//program to print sum and average of 10 numbers using pointer. //comment of program
#include <stdio.h>            //header file
#include<conio.h>
int main()                   //main function
{
    int *p;                   //pointer declaration
    int a[20],i,k,sum=0;          //variable declaration
    int total;
    printf("enter total number\n");
    scanf("%d",&total);            // gets total value of array.
    p=a;                       //stores base address
    for(i=0;i<total;i++)      //runs from 0 to one less than total
    {
        scanf("%d",p+i);   //gets value for given address. This input goes upto last value of address
        sum=sum+*(p+i);   // finds sum
    }
    printf("the sum=%d\n",sum);          // prints sum
    printf("the average =%f\n",(float)sum/total);//prints average
   getch();
    return 0;
}

---------------------------------------------------------------------------------------------------------
or
----------------------------------------------------
//program to print sum and average of 10 numbers using pointer. //comment of program
#include <stdio.h>            //header file
int main()                   //main function
{
    int a[20],i,sum=0;          //variable declaration
    int total;
    printf("enter total number\n");
    scanf("%d",&total);            // gets total value of array.
    for(i=0;i<total;i++)      //runs from 0 to one less than total
    {
        scanf("%d",a+i);   //gets value for given address , starting from 0. This input goes upto last value of address
        sum=sum+*(a+i);   // finds sum
    }
    printf("the sum=%d\n",sum);          // prints sum
    printf("the average =%f\n",(float)sum/total);//prints average
    return 0;
}


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