Question

In my simple program, when it executes the getchar method execute before printf method.
Why this happen and how to solve this??

#include <stdio.h>
#include <stdlib.h>

#define SUCCESS 0

void exit_Pro()
{
    printf("Press any Key to exit: ");
    fflush(stdin);
    getchar();
}
int main(int argc, char **argv) {
    atexit(exit_Pro);

    return SUCCESS;
}

Platform: Window 7
Compiler(IDE): Eclipse CDT

Answer 1

First of all, I agree with nonsensical: fflush(stdin) is a bad thing to do. Here’s further explanation. (And if 9 experienced programmers all told me that I was doing something wrong, I’d believe them.)

Now, to try and help you debug your code, can you tell us whether this simplified code exhibits the same problem on your system?

#include <stdio.h>

int main(int argc, char *argv[]) {
    printf("Press any Key to exit: ");
    fflush(stdout);
    getchar();
}