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;
}
}prime number in c
#include<stdio.h>
void main(){
int num, i;
int cp = 1;
printf("Enter a number = ");
scanf("%d",&num);
if(num > 0){
for(i = 2; i < num; i++){
if(num % i == 0){
cp = 0;
}
}
if(cp == 1){
printf("%d is a prime number.", num);
}
else{
printf("%d isn't a prime number.", num);
}
}
}Copyright © 2021 Codeinu
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