prime check in c
int isPrime(long long number) {
if (number == 0 || number == 1 || (number % 2 == 0 && number > 2)) {
return 0;
}
else {
for (long long i=3; i <= (long long)sqrt(number)+1; i++) {
if (number % i == 0) {
return 0;
}
}
return 1;
}
}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";
}prime number c
#include <stdio.h>
int main()
{
int i, num, p = 0;
printf("Please enter a number: \n");
scanf("%d", &num);
for(i=1; i<=num; i++)
{
if(num%i==0)
{
p++;
}
}
if(p==2)
{
printf("Entered number is %d "\
"and it is a prime number.",num);
}
else
{
printf("Entered number is %d "\
"and it is not a prime number.",num);
}
}check if number is prime in c
#include<stdio.h>
int main()
{
int num,i,flag=0;
printf("enter the number:");
scanf("%d",&num);
for(i=2;i<=(num/2);i++)
{
if(num%i==0)
flag=1;
}
if(flag==0)
printf("%d is a prime number",num);
else
printf("%d is not a prime number",num);
return 0;
}Copyright © 2021 Codeinu
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