Check whether a given number is prime or not (using for loop)

C Programming Language / Loop control in C Language

959

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Program:

#include<stdio.h>
void main()
{

int number, i;
int indicator =  0;
printf("Enter a number to check prime or Not: ");
scanf("%d",&number);

for(i = 2; i < number/2; i++)
{
	if(number%i == 0)
	{
	 indicator = 1;
	 break;
	}
}

if(indicator == 1){
	printf(" \n Number %d is not prime. \n", number);
}
else{
	printf(" \n Number %d is prime. \n", number);
}


}

Output:

Enter a number to check prime or Not: 13

 Number 13 is prime.

Enter a number to check prime or Not: 15

 Number 15 is not prime. 

Explanation:

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