Introduction
Write a C program to check whether a number is Prime number or not using while & for loop
Check whether a number is Prime number or not using while loop
Write a C program to check whether a number is Prime number or not using while & for loop
#include<stdio.h>
int main()
{
int num, i, f;
//Readind a number from user
printf("Enter any number: ");
scanf("%d", &num);
f = 0;
i = 2;
while(i <= num/2)
{
if(num%i == 0)
{
f=1;
break;
}
i++;
}
if(f == 0)
printf("%d is a Prime Number", num);
else
printf("%d is Not a Prime Number", num);
return 0;
}Check whether a number is Prime number or not using for loop
#include<stdio.h>
int main()
{
int num, i, f;
//Reading a number from user
printf("Enter a number: ");
scanf("%d",&num);
f=0;
for(i=2; i <= num/2; i++)
{
if(num%i == 0)
{
f=1;
break;
}
}
if(f==0)
printf("%d is a Prime Number", num);
else
printf("%d is a Not Prime Number", num);
return 0;
}Result
