Check for buffer overflow

overflow.c

#include <stdio.h>

int main() {
    struct {
        char buffer[sizeof(int)]; //must be word aligned or will be forced by the compiler
        volatile int modified;
    } container;

    container.modified = 0;
    
    printf("System word size is: %lu\nEnter Text: ", sizeof(int));
    gets(container.buffer);

    if(container.modified) {
        printf("Buffer overflow detected\n");
    } else {
        printf("You didn't overflow\n");
    }
}