prime numbers in c
#include<stdio.h>
main() {
int n, i, count=0;
printf("Enter Number");
scanf("%d",&n);
for ( i = 1; i<= n; i++) {
if (n % i == 1) {
count++;
}
}
if( count == 2) {
printf("Prime Number");
}
else {
printf("Not A Prime Number");
}
}program to know if a number is prime
#include<bits/stdc++.h>
using namespace std;
bool Is_Prime(long long x){
if(x%2==0)return false;
for(int i=3;i*i<=x;i+=2)
if(x%i==0)return false;
return true;
}
int main(){
long long x;
cin>>x;
if(Is_Prime(x))cout<<"Is Prime";
else cout<<"Is not Prime";
}Copyright © 2021 Codeinu
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