I have just started to learn C after a long time (briefly learnt it during school but mostly forgot everything since then). Anyways I just wrote a simple program to calculate simple interest.

#include <stdio.h>

int main( ) {
    int p,n;
    float r,si;

    printf("Enter the value");
    scanf("%d,%d,%f",&p,&n,&r);

    si = p*r*n/100;
    printf("%fn",si);

    return 0;
}

But one thing I noticed was that not including the printf statement at the end causes the C compiler to give the following error.

The system cannot execute the specified program.

It also causes my antivirus (McAffe) to treat the .exe file as a threat.

Does anyone know why this happens. I’m just curious.