WAP to enter marks of 30 students, save it in an array and find the average of the marks.

#include<stdio.h>
#include<conio.h>
void main()
{
 int j,a[40];
 int i,s=0;
 float d;
 clrscr();
 printf("Enter the Numbers ");
 for(i=0;i<30;i++)
 scanf("%d",&a[i]);
 for(i=0;i<30;i++)
 {
  s=s+a[i];
 }
 d=(s/30);
 printf("The average of Student is = %f",d);
 getch();
}

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WAP to take any single alphabet as input and find out if user has entered it in upper case or lower case using switch.

#include<stdio.h>
#include<conio.h>
void main()
{
 int j;
 char i;
 clrscr();
 printf("Enter the Alphabet ");
 scanf("%c",&i);
 if(i>='A' && i<='Z')
 j=1;
 else if(i<'z' && i>='a')
 j=2;
 switch(j)
   {
     case 1:printf("Upper case");
     break;
     case 2:printf("Lower Case");
     break;
     default:printf("Wrong input");
   }
 getch();
}

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WAP to take the percentage marks of a student as input and find which division the student falls into using switch statement.
#include<stdio.h>
#include<conio.h>
void main()
{
 int i,j;
 clrscr();
 printf("Enter the Percentage ");
 scanf("%d",&i);
 if(i>=90 && i<=100)
 j=1;
 else if(i<90 && i>=70)
 j=2;
 else if(i<70 && i>=60)
 j=3;
 else if(i<60 && i>=45)
 j=4;
 else if(i<45 && i>=35)
 j=5;
 else if(i<35 && i>=0)
 j=6;
 switch(j)
   {
     case 1:printf("Division A");
     break;
     case 2:printf("Division B");
     break;
     case 3:printf("Division C");
     break;
     case 4:printf("Division D");
     break;
     case 5:printf("Division E");
     break;
     case 6:printf("Division F");
     break;
     default:printf("Wrong input");
   }
 getch();
}

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WAP to print 2 columns of numbers from 1 to 100 and 100 to 1, provided that there should never be same numbers in a row… ex: 2 2 is never printed

#include<stdio.h>
#include<conio.h>
void main()
{
 int i,j;
 clrscr();
for(i=1,j=100;i<=100,j>=1;i++,j--)
{
 if(i==j)
 continue;
 else
 printf("%d,%d ,",i,j);
}
  getch();
}

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WAP to print prime numbers between 1-200 using do while loop.

#include<stdio.h>
#include<conio.h>
void main()
{
 int a[100];
 int i,k=1,j;
 int count=0;
 clrscr();
 a[k]=1;

  i=3;
 do{
 j=2;
   do{
    if(i%j==0)
      {
       count=1;
      }
      j++;
   }while(j<i);
   if(count==0)
   a[++k]=i;
   count=0;
   i++;
 }while(i<=200);
  i=1;
  do{
  printf("%d,",a[i]);
  i++;
  }while(i<=k);
  getch();
}

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WAPto print first 100 prime numbers using for loop 

#include<stdio.h>
#include<conio.h>
void main()
{
 int a[70];
 int i,k=1,j;
 int count=0;
 clrscr();
 a[k]=1;

  for(i=3;i<=100;i++)
 {
  for(j=2;j<i;j++)
   {
    if(i%j==0)
      {
       count=1;
      }
   }
   if(count==0)
   a[++k]=i;
   count=0;
 }
  for(i=1;i<=k;i++)
  {
  printf("%d,",a[i]);
  }
  getch();
}

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