Program to check that entered no is divisible by 5 or not.

//program to check that entered no is divisible by 5 or not.
#include<stdio.h>
#include<conio.h>
main()
{ int n,r,s,i;
 printf("Enter the no ");
 scanf("%d",&n);
 s=0;
for(i=0;i<1;i++)
 { r=n%10;
  n=n/10;
 }
 if(r==0||r==5)
 printf("Entered no is divisible by 5");
 else
 printf("Entered no is Not divisible by 5");
getch();
}

Program to count number of digits in a number.

// program to count number of digits in a number.
#include<stdio.h>
#include<conio.h>
main()
{
     int  num,count=0;
  printf("Enter a number: ");
  scanf("%d",&num);
   while(num)
  {
      num=num/10;
      count++;
  }
  printf("Total digits is:  %d",count);
getch();
}

Program to check that entered no is divisible by 9 or not.

//program to check that entered no is divisible by 9 or not.
#include<stdio.h>
#include<conio.h>
main()
{ int n,r,s;
 printf("Enter the no ");
 scanf("%d",&n);
 s=0;
 while(r!=0)
 { r=n%10;
  n=n/10;
  s=s+r;
 }
 if(s%9==0)
 printf("Entered no is divisible by 9");
 else
 printf("Entered no is Not divisible by 9");
getch();
}

Program to check that entered no is divisible by 10 or not.

//program to check that entered no is divisible by 10 or not.
#include<stdio.h>
#include<conio.h>
main()
{ int n,r,s,i;
 printf("Enter the no ");
 scanf("%d",&n);
 s=0;
for(i=0;i<1;i++)
 { r=n%10;
  n=n/10;
 }
 if(r==0)
 printf("Entered no is divisible by 10");
 else
 printf("Entered no is Not divisible by 10");
getch();
}

Program to check that entered no is divisible by 3 or not.

//program to check that entered no is divisible by 3 or not.
#include<stdio.h>
#include<conio.h>
main()
{ int n,r,s;
 printf("Enter the no ");
 scanf("%d",&n);
 s=0;
 while(r!=0)
 { r=n%10;
  n=n/10;
  s=s+r;
 }
 if(s%3==0)
 printf("Entered no is divisible by 3");
 else
 printf("Not divisible by 3");
getch();
}

Program to Print fibonacci series.

// The fibonacci series.
#include<stdio.h>
#include<conio.h>
main()
{
      int i,n,f,s,t;
      printf("How many element you want to print:");
      scanf("%d",&n);
      f=0;
      s=1;
      printf("The  fibonacci series up to %d is : %d,%d",n,f,s);
      for(i=0;i<n-2;i++)
      {                
       t=f+s;
       f=s;
       s=t;
       printf(",%d",t);
       }
       getch();
       }
      
     

Program to print the pyramid of no.

//Program to print the  pyramid of no.
              1
          1  2  3 
       1 2  3  4  5
    1 2 3  4  5  6  7
#include<stdio.h>
#include<conio.h>
main()
{
      int x,y,i,g;
      y=1;
      for(x=3;x>=0;x--)
      {
      for(i=1;i<=x;i++)
       {printf("   ");
       }g=1;
       for(i=0;i<y;i++)
       {printf(" %d",g);g++;
       }
      
       y=y+2;
       printf("\n\n");
       }
       getch();
       }

Program to Print the pyramid.

//Program to Print the pyramid.
       *
     ***
   *****
 *******
#include<stdio.h>
#include<conio.h>
main()
{
      int x,y,i;
      y=1;
      for(x=3;x>=0;x--)
      {
      for(i=1;i<=x;i++)
       {printf(" ");
       }
       for(i=0;i<y;i++)
       {printf("*");
       }
      
       y=y+2;
       printf("\n\n");
       }
       getch();
       }

Program to Print the pyramid.

//Program to Print the pyramid.
             *
         ***
     *****
 *******

#include<stdio.h>
#include<conio.h>
main()
{
      int x,y,i;
      y=1;
      for(x=3;x>=0;x--)
      {
       for(i=1;i<=x;i++)
       {printf("  ");
       }
       for(i=1;i<=y;i++)
       {printf("*");
       }
       y=y+2;
       printf("\n");
       }
       getch();
       }

Program to print the reverse pyramid of no.

//Program to print the reverse pyramid of no.
1 2 3 4 5 6 7 8 9

  1 2 3 4 5 6 7

    1 2 3 4 5

       1 2 3

          1
#include<stdio.h>
#include<conio.h>
main()
{
      int x,y,i,g;
      y=9;
      for(x=4;x>=0;x--)
      {
      for(i=4;i>x;i--)
       {printf(" ");
       }g=1;
       for(i=0;i<y;i++)
       {printf("%d",g);g++;
       }
      
       y=y-2;
       printf("\n");
       }
       getch();
       }

Program to Print the pyramid.

//Print the pyramid like..
*********
  *******
   *****
     ***
       *
#include<stdio.h>
#include<conio.h>
main()
{
      int x,y,i;
      y=9;
      for(x=4;x>=0;x--)
      {
      for(i=4;i>x;i--)
       {printf(" ");
       }
       for(i=0;i<y;i++)
       {printf("*");
       }
      
       y=y-2;
       printf("\n");
       }
       getch();
       }

Program to check entered character is special symbol or not.

//Program to check entered character is special symbol or not.
#include<stdio.h>
#include<conio.h>
main()
{ int i;
char c;
printf("Enter character");
scanf("%c",&c);
i=c;
if((c>=0&&c<=47)||(c>=58&&c<=64))
printf("You entered a special character ");
else
printf("Not special character");
getch();
}

Program to print the triangle of no.

// Program to calculate the triangle of no.
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
#include<stdio.h>
#include<conio.h>
main()
{
       int x,i;
       for(x=1;x<=5;x++)
       {
          for(i=1;i<=x;i++)
         {
                          printf("  %d",i);
          }
                          printf("\n\n");
       }
 getch();
   }

Program to Print the triangle of star.

// Program to calculate the triangle of star.





*
* *
* * *
* * * *
* * * * *
#include<stdio.h>
#include<conio.h>
main()
{
       int x,i;
       for(x=1;x<=5;x++)
       {
        for(i=1;i<=x;i++)
        {
                          printf("  *");
                          }
                          printf("\n\n");
                          }
                          getch();
                          }

Entered no is Armstrong no or not.

//Entered no is Armstrong no or not.
#include<stdio.h>
#include<conio.h>
main()
{ int d,r,n,s;
 printf("Enter no:");
 scanf("%d",&n);
 d=n;
 s=0;
do
 {
  r=d%10;
  d=d/10;
  s=s+(r*r*r);
 }while(d!=0);
 if(s==n)
 printf("Armstrong no");
 else
 printf("Not Armstrong no");
getch();
}

Program to reverse the entered no .

//Program to reverse the entered no .
#include<stdio.h>
#include<conio.h>
main()
{ int d,r,n;
 printf("Enter no:");
 scanf("%d",&n);
 d=n;
do
 {
  r=d%10;
  printf("%d",r);
  d=d/10;

}while(d!=0);
getch();
}

Program to find factorial of any no.

//Program to find factorial of any no.
#include<stdio.h>
#include<conio.h>
main()
{
      int i,fact,n;
      printf("Enter the no:");
      scanf("%d",&n);
      fact=1;
      for(i=1;i<=n;i++)
      { 
        fact=fact*i;
        }
        printf("The factorial of %d no is :- %d",n,fact);
        getch();
 }

Program to print first n natural no and their sum

//Program to print first n natural no and their sum.
#include<stdio.h>
#include<conio.h>
main()
{
      int i,sum,n;
      printf("How many natural no?");
      scanf("%d",&n);
      sum=0;
      for(i=1;i<=n;i++)
      {  printf("%d\n",i);
         sum=sum+i;
      }
      printf("The sum of first %d natural no is :-%d",i,sum);
      getch();
      }

Show all odd numbers from 0 to your entered no.

//Show all odd numbers from o to your entered no.
#include<stdio.h>
#include<conio.h>
main()
{ int i,n;
  printf("Enter any no-");
  scanf("%d",&n);
  printf("Odd no is-");
  for(i=1;i<=n;i=i+2)
  {
     printf("%d\n",i);
 
     }
     getch();
     }
    

Count backwards of any no.

//Count backwards of any no using a for loop.
#include<stdio.h>
#include<conio.h>
main()
{ int i,n;
 printf("Enter any no-");
 scanf("%d",&n);
 printf("backwards of no--");
 for(i=n;i>=0;i--)
 { printf("%d\n",i);
}
getch();
}