Loop Programs

Print 1 to 10

/* Print 1 to 10 using while loop */
#include<stdio.h>
int main()
{
    int i=1;
    while(i <= 10)
    {
        printf("%d\n",i);
        i++;
    }

    return 0;
}

Factorial

/* Calculate factorial using while loop */
#include<stdio.h>
int main()
{
    int a,f,i;
    printf("Enter a number: ");
    scanf("%d",&a);
    f=1;
    i=1;
    while(i<=a)
    {
        f = f * i;
        i++;
    }
    printf("Factorial: %d",f);
 return 0;
}

Power

/* calculate power using while loop */
#include<stdio.h>
int main()
{
    int a, b, i, p;
    printf("Enter value of a: ");
    scanf("%d",&a);
    printf("Enter value of b: ");
    scanf("%d",&b);   
    p=1;
    i=1;
    while(i<=b)
    {
        p = p * a;
        i++;
    }
    printf("Power : %d",p);
 return 0;
}

Sum of digits

/* Sum of digits using while loop */
#include <stdio.h>

int main()
{
 int n, s = 0;
 
 printf("Please enter a number: ");
 scanf("%d",&n);
 
 while (n > 0)
 {
  s = s + n%10;
  n = n/10;
 }
 
 printf("Sum of digits is: %d", s);
 return 0;
}

Reverse Number

/* Reverse a Number using while loop */
#include <stdio.h>
int main()
{
 int n, r = 0;
 
 printf("Please enter a number: ");
 scanf("%d",&n);
 
 while (n > 0)
 {
  r = r * 10;
  r = r + n%10;
  n = n/10;
 }
 
 printf("Reversed number is = %d: ", r);
 return 0;
}

Palindrome Number

/* Palindrome number using while loop */
#include <stdio.h>
int main()
{
 int n, r = 0,t;
 
 printf("Please enter a number: ");
 scanf("%d",&n);

 t=n;
 while (n > 0)
 {
  r = r * 10;
  r = r + n%10;
  n = n/10;
 }
 
 if(t==r)
  printf("Number is Palindrome");
 else
  printf("Number is not Palindrome");
  
 return 0;
}

------------------------------------------------------------------

/* Palindrome number using for loop */
#include <stdio.h>
int main()
{
 int n, r, t;
 
 printf("Please enter a number: ");
 scanf("%d",&n);
 
 t=n;
 for(r=0;n>0;n=n/10)
 {
  r = r * 10;
  r = r + n%10;
 }
 
 if(t==r)
  printf("Number is Palindrome");
 else
  printf("Number is not Palindrome");
  
 return 0;
}

Fibonacci Series

/* Fibonacci Series using while loop */
// 0 1 1 2 3 5 8 13...
#include<stdio.h>
int main()
{
    int n,i,a,b,c;
    printf("Enter a number: ");
    scanf("%d",&n);
    i=1;
    a=0;
    b=1;
    while(i<=n)
    {
        printf("%d ",a);
        c = a + b;
        a = b;
        b = c;
        i++;
    }
 return 0;
}

Prime Number

/* Prime Number using while loop */

#include<stdio.h>
int main()
{
    int a,i,f;
    printf("Enter a number: ");
    scanf("%d",&a);
    f=0;
    i=2;
    while(i <= a/2)
    {
        if(a%i == 0)
        {
            f=1;
            break;
        }
        i++;
    }
    if(f==0)
        printf("Prime Number")
    else
        printf("Not Prime Number");
 return 0;
}

-------------------------------------------------------

/* Prime number using for loop */

#include<stdio.h>
int main()
{
    int a,i,f;
    printf("Enter a number: ");
    scanf("%d",&a);
    f=0;
    for(i=2;i <= a/2;i++)
    {
        if(a%i == 0)
        {
            f=1;
            break;
         }
    }
    if(f==0)
        printf("Prime Number")
    else
        printf("Not Prime Number");
 return 0;
}

Armstrong Number

/* Check Armstrong Number */

#include<stdio.h>
int main()
{
    int n, sum = 0, t, r;

    printf("Please enter a number: ");      
    scanf("%d",&n);

    for(t=n;t>0;t=t/10)
    {
        r = t%10;
        sum = sum + r*r*r;
    }
     if ( n == sum )
        printf("%d is an armstrong number.",n);
    else
        printf("%d is not an armstrong number.",n);

    return 0;
}

Armstrong Numbers upto N

/* Print Armstrong Numbers upto N */

#include<stdio.h>

int main()
{
    int i,j,sum,n;

    printf("Please enter the value of N: ");
    scanf("%d",&n);
  
    for(i=2;i<=500;i++)
    {
        for(j=i,sum=n;j>=1;j=j/10)
            sum=sum+(j%10)*(j%10)*(j%10);
        if(sum==i)
            printf("%d is Armstrong.\n",i);
    }
    return 0;
}

Compound Interest

/*    Compund Interest    */
#include<stdio.h>
#include<math.h>
int main()
{
     float p,r,i,t,ci,a;

  
     printf("Type the amount : ");
     scanf("%f",&p);
     printf("Type the interest rate : ");
     scanf("%f",&r);
     printf("Type the period in years: ");
     scanf("%f",&t);
  
     i=1+(r/100);
  
     // ci=pow(i,t);
     ci=1;
     for(a=1;a<=t;a++)
        ci=ci*i;
     
     ci=p*ci-p;
  
     printf("Your compound interest is : %.2f",ci);

     return 0;
}

Pascal Triangle

1

1 1

1 2 1

1 3 3 1 

1 4 6 4 1

long fact(int);

int main()

{

 int i, j;

   for (i=0;i<5;i++)

   {

      for(j=0;j<=i;j++)

      {

         printf("%ld ",fact(i)/(fact(j)*fact(i-j)));

      }

      printf("\n");

   }

   return 0;

}

long fact(int n)

{

  int i;

    long f = 1;

    for(i=1;i<=n;i++)

      f = f*i;

    return f;

}