I am new to programming world, I made a program to check if the given number is prime or not, but it is showing unusual behaviour.
My code:
#include <stdio.h>
void main()
{
int n;
printf("Enter n:");
scanf("%d", &n);
for (int i = 0; i <= n - 1; i )
{
if (n % i == 0)
{
printf("n is not a prime number!");
break;
}
if (i == n - 1)
{
printf("n is prime!");
}
}
}
Expected Output:
Enter n:5
n is prime!
Actual Output:
Enter n:5
Reference Screenshot
Using VS Code and MinGW.
Thanks in Advance
CodePudding user response:
For starters according to the C Standard the function main without parameters shall be declared like
int main( void )
In this for loop
for (int i = 0; i <= n - 1; i )
{
if (n % i == 0)
//..
there is division by zero when i
is equal to 0.
Apart from this any number prime or not prime is divisible by 1. So in any case the approach with this for loop is incorrect.