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Program to input 20 numbers and pick the greatest one using pointer.

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

//Program to input 20 numbers and pick the greatest one using pointer.
#include <stdio.h>            //header file
int main()
{
    int a[100];                 //array declaration
    int i,max;
    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=*(a+0);                          //It stores value stored in location 0
    for(i=0;i<total;i++)
    {
       if(max<*(a+i))                   //comparison takes place
       {
         max=*(a+i);                    //assigning value
       }
    }
    printf("max value=%d",max);       //display of maximum value
    return 0;
}
-------------------------------------------------------------------------------------------------------------
using turbo c++
----------------------------------------------------------------------------------------------------------
//program to pick the greatest number using pointer
#include <stdio.h>            //header file
#include<conio.h>
int main()
{
    int a[100];                 //array declaration
    int i,max;
    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=*(a+0);                          //It stores value stored in location 0
    for(i=0;i<total;i++)
    {
       if(max<*(a+i))                   //comparison takes place
       {
         max=*(a+i);                    //assigning value
       }
    }
    printf("max value=%d",max);       //display of maximum value
getch();   
 return 0;
}


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program to input elements of array and display them using pointer.

using codeblocks
-------------------------------------------------------------------------------------------
//program to input elements for an array and display using pointer //comment of program
#include <stdio.h>            //header file

int main()                   //main function
{
    int *p;                   //pointer declaration
    int a[20],i;
    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
    }
    printf("values are\n");
    for(i=0;i<total;i++)
    {
        printf("%d\n",*(p+i));//displays its value with the help of address
    }
    return 0;
}

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or
-------------------------------------------------------------------------------------------------------------------
//program to input elements for an array and display using pointer //comment of program
#include <stdio.h>            //header file

int main()                   //main function
{
 
    int a[20],i;
    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",a+i);   //gets value for given address. This input goes upto last value of address
                                     //array itself is a pointer. It accepts value for first location and so on.
    }
    printf("values are\n");
    for(i=0;i<total;i++)
    {
        printf("%d\n",*(a+i));//displays its value with the help of address
    }
    return 0;
}



------------------------------------------------------------------------------------------------------------------
using turboc++
------------------------------------------------------------------------------------------------------
//program to input elements for an array and display 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;
    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
    }
    printf("values are\n");
    for(i=0;i<total;i++)
    {
        printf("%d\n",*(p+i));//displays its value with the help of address
    }
getch();
    return 0;
}

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program to understand call by value and call by reference

using codeblocks
--------------------------------------------------------------------------------
// call by value reference
#include <stdio.h>
void callbyref(int*, int*);             /* function Prototype with two pointer as parameter*/

int main()                            /* Main function */
{
  int x = 10, y = 20;                 //variable declaration

    printf("before calling\n");                         /* actual arguments will be altered */
  printf("x=%d,y=%d\n",x,y);        //value display before call
  callbyref(&x, &y);              // passing address
  printf("after calling\n");
  printf("x= %d, y= %d\n", x, y);   //displaying value after calling
  return 0;
}

void callbyref(int *m, int *n)
{
  int t;
  t = *m;
  *m = *n;
  *n = t;                       //swapping being done
}


----------------------------------------------------------------------------------------------
using turbo c++
-----------------------------------------------------------------------------------------
// call by value reference
#include <stdio.h>
#include<conio.h>
void callbyref(int*, int*);             /* function Prototype with two pointer as parameter*/

int main()                            /* Main function */
{
  int x = 10, y = 20;                 //variable declaration

    printf("before calling\n");                         /* actual arguments will be altered */
  printf("x=%d,y=%d\n",x,y);        //value display before call
  callbyref(&x, &y);              // passing address
  printf("after calling\n");
  printf("x= %d, y= %d\n", x, y);   //displaying value after calling
 getch();
  return 0;
}

void callbyref(int *m, int *n)
{
  int t;
  t = *m;
  *m = *n;
  *n = t;                       //swapping being done
}

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program to understand array of pointer

using codeblocks
---------------------------------------------------------------------------------------------------------
//understanding array of pointers  for numbers     //title of program
#include <stdio.h>                    //header file

int main()
{
    int a[4],i;
    int *p[4];                        //pointer to store 4 addresses
    printf("enter array elements\n");
    for(i=0;i<=3;i++)
    {
        printf("enter element for location %d\n",i);
        scanf("%d",&a[i]);           // gets array elements
    }
    printf("the addresses are\n");
    for(i=0;i<=3;i++)
    {
        p[i]=&a[i];                 // stores address of element of array
        printf(" location =%d and address=%d\n",i,p[i]);//prints the address
    }
    printf("the values are\n");
    for(i=0;i<=3;i++)
    {
        p[i]=&a[i];                 // stores address of element of array
        printf(" location =%d and address=%d\n",i,*p[i]);//prints the value
    }
    return 0;
}

---------------------------------------------------------------------------------------
using turbo c++
-----------------------------------------------------------------------------------------
//understanding array of pointers  for numbers     //title of program
#include <stdio.h>                    //header file
#include<conio.h>

int main()
{
    int a[4],i;
    int *p[4];                        //pointer to store 4 addresses
    printf("enter array elements\n");
    for(i=0;i<=3;i++)
    {
        printf("enter element for location %d\n",i);
        scanf("%d",&a[i]);           // gets array elements
    }
    printf("the addresses are\n");
    for(i=0;i<=3;i++)
    {
        p[i]=&a[i];                 // stores address of element of array
        printf(" location =%d and address=%d\n",i,p[i]);//prints the address
    }
    printf("the values are\n");
    for(i=0;i<=3;i++)
    {
        p[i]=&a[i];                 // stores address of element of array
        printf(" location =%d and address=%d\n",i,*p[i]);//prints the value
    }
getch();
    return 0;
}

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program to use 2d array/string to display address and values.

using codeblocks
---------------------------------------------------------------------------------------------------
//understanding array of pointers  for strings     //title of program
#include <stdio.h>                    //header file
int main()
{
     char *a[4];                      //pointer to store 4 addresses
    int i;
    char naam[4][6];                   //2d array of string
    printf("enter array elements\n");
    for(i=0;i<=3;i++)
    {
        printf("enter name for location %d\n",i);
        scanf("%s",naam[i]);                            // gets array elements
    }

    printf("the addresses are\n");
    for(i=0;i<=3;i++)
    {
         a[i]=&naam[i];                                // stores address of element of array
        printf(" location =%d and address=%d\n",i,a+i);//prints the address
    }
    printf("the values are\n");
    for(i=0;i<=3;i++)
    {
        a[i]=&naam[i];                                 // stores address of element of array
        printf(" location =%d and name=%s\n",i,*(a+i));//prints the stored value
    }
    return 0;
}

//note:-
//1. in 2d string of array, a=naam does not work. We have to work manually by assigning address as shown above.
//we can not print values or addresses using a[i]. it does not work.
-----------------------------------------------------------------------------------------------------
using turbo c++
---------------------------------------------------------------------------------------------------
//understanding array of pointers  for strings     //title of program
#include <stdio.h>                    //header file
#include<conio.h>                  //header file
int main()
{
     char *a[4];                      //pointer to store 4 addresses
    int i;
    char naam[4][6];                   //2d array of string
    printf("enter array elements\n");
    for(i=0;i<=3;i++)
    {
        printf("enter name for location %d\n",i);
        scanf("%s",naam[i]);                            // gets array elements
    }

    printf("the addresses are\n");
    for(i=0;i<=3;i++)
    {
         a[i]=&naam[i];                                // stores address of element of array
        printf(" location =%d and address=%d\n",i,a+i);//prints the address
    }
    printf("the values are\n");
    for(i=0;i<=3;i++)
    {
        a[i]=&naam[i];                                 // stores address of element of array
        printf(" location =%d and name=%s\n",i,*(a+i));//prints the stored value
    }
   getch();
    return 0;
}

//note:-
//1. in 2d string of array, a=naam does not work. We have to work manually by assigning address as shown above.
//we can not print values or addresses using a[i]. it does not work.

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program to reverse a string using pointer

using codeblocks
--------------------------------------------------------------------------------------------
//program to reverse a string using pointer//comment of program
#include <stdio.h>                         //header file
#include<string.h>
int main()                              //main function
{
    char name[40];                     //character declaration
    char *p;                          //pointer declaration.
    int length;
    puts("enter string\n");           //display of message
    gets(name);                      // gets data/string
    length=strlen(name);             //stores length os 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 total location  until it reaches 0.
    {
        putchar(*p);                 //prints the value stored in particular location
        p--;                             //decreases the value
    }
    return 0;
}
----------------------------------------------------------------------------------------------
using turbo c++
----------------------------------------------------------------------------------------------
//program to reverse a string using pointer//comment of program
#include <stdio.h>                         //header file
#include<string.h>
#include<conio.h>
int main()                              //main function
{
    char name[40];                     //character declaration
    char *p;                          //pointer declaration.
    int length;
    puts("enter string\n");           //display of message
    gets(name);                      // gets data/string
    length=strlen(name);             //stores length os 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 total location  until it reaches 0.
    {
        putchar(*p);                 //prints the value stored in particular location
        p--;                             //decreases the value
    }
getch();
    return 0;
}
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program to reverse a string using pointer.

using codeblocks
------------------------------------------------------------------------------------------
//program to reverse a string using pointer//comment of program
#include <stdio.h>                         //header file

int main()                              //main function
{
    char name[40]="ramesh Shrestha";  //assignment of string
    char *p;                          //pointer declaration
    p=name+15;  //p=name takes address location 0 to pointer.

  // assigning total address as in given string; it becomes 15 starting from 0
    while(--p>=name)                 //the value of 'p' decreases from location 15 until it reaches 0.
    {
        putchar(*p);                 //prints the value stored in particular location
    }
    return 0;
}
 ----------------------------------------------------------------------------------------------------

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

//program to reverse a string using pointer//comment of program
#include <stdio.h>                         //header file
#include<conio.h>

int main()                              //main function
{
    char name[40]="ramesh Shrestha";  //assignment of string
    char *p;                          //pointer declaration
    p=name+15;       //p=name takes address location 0 to pointer.
                
// assigning total address as in given string; it becomes 15 starting from 0
    while(--p>=name)                 //the value of 'p' decreases from location 15 until it reaches 0.
    {
        putchar(*p);                 //prints the value stored in particular location
    }
getch();
    return 0;
}

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