## Friday, December 11, 2015

### C Programs on flow control statements (if, switch, loop, break and continue)-8

c program to find out prime factors of given number

Algorithm
1. Find factor of a given number
2. Apply prime number program to check whether factor is prime or not

main()
{
int num,i=1,j,k;
printf("\nEnter a number:");
scanf("%d",&num);
while(i<=num)
{
k=0;
if(num%i==0)   /* Finding factor */
{
j=1;
while(j<=i)  /* Check prime or not */
{
if(i%j==0)
k++;
j++;
}
if(k==2)
printf("\n%d is a prime factor",i);
}
i++;
}
}

C Program to Display Prime Numbers between Two Intervals

#include <stdio.h>
int main()
{
int n1, n2, i, j, flag;
printf("Enter two numbers(intevals): ");
scanf("%d %d", &n1, &n2);
printf("Prime numbers between %d and %d are: ", n1, n2);
for(i=n1+1; i<n2; ++i)
{
flag=0;
for(j=2; j<=i/2; ++j)
{
if(i%j==0)
{
flag=1;
break;
}
}
if(flag==0)
printf("%d ",i);
}
return 0;
}

C Program to Display Armstrong Number Between Two Intervals

#include <stdio.h>
int main()
{
int n1, n2, i, temp, num, rem;
printf("Enter two numbers(intervals): ");
scanf("%d %d", &n1, &n2);
printf("Armstrong numbers between %d an %d are: ", n1, n2);
for(i=n1+1; i<n2; ++i)
{
temp=i;
num=0;
while(temp!=0)
{
rem=(temp%10);
num+=rem*rem*rem;
temp/=10;
}
if(i==num)
{
printf("%d ",i);
}
}
return 0;
}

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