Programs: for, while, do-while.

Program with for loop

#include<stdio.h>
#include<conio.h>
void main()
{
  int i=0;
  for(i=0;i<10;i++)
  {
    printf("%d\n",i );
  }
}

Output:

 Program with while (pre increment)

#include<stdio.h>
#include<conio.h>
void main()
{
  int i=0;
  while (i<10)
  {
    i++;
    printf("%d\n",i );
  }
}

Output:

   Program with while (pre increment)

#include<stdio.h>
#include<conio.h>
void main()
{
  int i=0;
  while (i<10)
  {
    printf("%d\n",i );
    i++;
  }
}

Output:

Program with do-while loop ( post increment)

#include<stdio.h>
#include<conio.h>
void main()
{
  int i=0;
  do
  {
    printf("%d\n",i );
    i++;
  }
  while(i<10);
}

Output:

Program with do-while loop ( pre increment)

#include<stdio.h>
#include<conio.h>
void main()
{
  int i=0;
  do
  {
    i++;
    printf("%d\n",i );
  }
  while(i<10);
}

Output:

Program with nested  for( printing rectangle triangle with *)

#include<stdio.h>
#include<conio.h>
void main()
{
  int i,j;
  for(i=0;i<=5;++i)
  {
    for(j=0;j<=i;++j)
    {
    printf("*");
    }
  printf("\n");
  }
}

Output:

Program with nested for:

11

222

3333

44444

555555

#include<stdio.h>
#include<conio.h>
void main()
{
  int i,j,c=1;
  for(i=1;i<=5;++i)
  {
    for(j=0;j<=i;++j)
    {
    printf("%d",c);
    }
    c=c+1;
  printf("\n");
  }
}

Output:

Program to Print n prime numbers.

#include<stdio.h>
#include<conio.h>
void main()
{
    int c,i,j;
    for (i=1;i<70;i++)
    {
     for(j=1;j<=i;j++)
     {
         if(i%j==0)
         {
           c=c+1;
         }
     }
        if(c==2)
         {
             printf("\n %d",i);
         }
         c=0;
    }
}

Output:

Program with nested for:

        *

      ***

    *****

  *******

#include<stdio.h>

#include<conio.h>

void main()

{

    int i,j,k,c;

    for ( j = 0; j <=5; j++)

    {

        c=2*j+1;

        for ( i = 5; i >=j; i--)

        {

        printf("  ");

        }

        for(k=1;k<=c;k++)

        {

            printf("*");

        }

        printf("\n");

    }

   

}

Output:

Program to print structure.

#include<stdio.h>

#include<conio.h>

void main()

{

    int i,j,k,c;

    for ( j = 0; j <=5; j++)

    {

        c=2*j+1;

        for ( i = 5; i >=j; i--)

        {

        printf("  ");

        }

        for(k=1;k<=c;k++)

        {

            printf("*");

        }

        printf("\n");

    }

   

}

Output: