hseb sol17:program to get all even numbers lying between 1 and 100

//program  to print/display all even numbers lying between 1 and 100.
#include<stdio.h>
#include<conio.h>
void main()
{
int k,n;
printf("enter value of 'n'\n");
scanf("%d",&n);
for(k=1;k<=n;k++)
   {
     if(k%2==0)
      {      printf("%d,",k);
      }
  }
getch();
}

hseb16 sol:program to get given star pattern

/*program to get following pattern
      * * * * *
      * * * *
      * * *
      * *
      * 
*/
#include<stdio.h>
#include<conio.h>
void main()
{
int i,j;
for(i=5;i>=1;i--)
  {
     for(j=1;j<=i;j++)
          {
                printf("* ");
          }
       printf("\n");
 }
getch();
}

hseb_12_sol:Program to know a number is Armstrong or not

/*program to check a number is Armstrong or not .
we are taking number with three digits*/
#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
clrscr();
int i,k,rem,sum=0;
printf("enter a three digit number to be checked\n");
scanf("%d",&i);
k=i;
while(i!=0)
{
     rem=i%10;
    sum=sum+pow(rem,3);
    i=i/10;
  }
 if(sum==k)
 {
       printf("%d is Armstrong\n",k);

 }
else
{
printf("%d is not Armstrong\n",k);;}
getch();
}

hseb solution:Program to get series 1,3,5,7....

//program  to print/display series 1 ,3,5,7,.......nth.
#include<stdio.h>
#include<conio.h>
void main()
{
int k,n;
printf(enter value of 'n'\n");
scanf("%d",&n);
for(k=1;k<=n;k=k+2)
   {          
       printf("%d,",k);
   }
getch();
}

hseb solution:program to show type casting concept

Type casting:This is used to convert one data type to another. Particularly, the conversion is done from low level to high level. Here level means total bytes occupied in memory. So the conversion is done from int to float or float to double or int to double and not vice versa.

It's of two types.
           1)Implicit casting::- In this , computer itself converts one data type to another that is called auto conversion.    
// program to show type casting concept

#include<stdio.h>
#include<conio.h>
void main()
{
int a=3,b=2;
float c;
c=a/b;
printf("%f",c);

}
Its output is 1.00. It is incorrect.
So, it should be avoided.

2)Explicit casting:
 In this conversion, we forcefully tell computer to convert one data type to another.It gives us right answer. To use this, we put word float in front of both numbers.
Example,
// program to show type casting concept

#include<stdio.h>
#include<conio.h>
void main()
{
int a=3,b=2;
float c;
c=(float) a/b;
printf("%f",c);

}
Its output is 1.5. It is correct.
Here, the computer, first converts both values(numerator and denominator ) into float then goes for division.
So, it should be used.

hseb solution:program to know a number is even or odd

First part:
Algorithm to know a number is even or odd
step 1:read/input a number 'x'
step 2:Let y= remainder obtained after dividing x by 2
step 3:If y=0 then
          display it is an even
         else
         display it is an odd
step 4:stop

second part:-

Flowchart:-

//'C' program to know a number is even or odd
#include<stdio.h>
#include<conio.h>
void main()
{
int x;
printf("enter a number\n");
scanf("%d",&x);
if(x%2==0)
{
printf("it is an even number");
}
else
{
printf("it is an odd number\n");
}
getch();
}

program to enter some elements and display that in opposite order.

//array program to input elements and to display them in reverse order
  #include<stdio.h>
  #include<conio.h>
  void main()
  {
  clrscr();
  int arr[100];      // array declaration with maximum size 100
  int size;     // size to be used to input elements
  int i;            //variable declaration
  printf("enter size of elements \n");//displays message
  scanf("%d",&size);                  //gets input for array size
  for(i=0;i<size;i++)
   {                            //loop execution
     printf("enter elements\n");//displays message
     scanf("%d",&arr[i]);      //gets input for  array entered by user

   }
   printf("elements, in reverse order, are\n");
   for(i=size-1;i>=0;i--)
   {
   printf("%d\n",arr[i]);       // displays  elements
   }
   getch();

   }
--------------------------------------------------
logics:-

1)declare an array of  partiular size.

2)input elements for this using loop.

3)to display, use loop from given size-1 to 0 location (look above)

that's all

more, u can understand from side by description given in program

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screen shot

output: