Local vs global variables in C

Quickstart guide for C pointers

Pointers, double pointers, pointer arithmetics, dereferencing, everything in a short and compact guide that you can reference anytime!

main.c

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

int y = 5;
int x;
void f1() {
    if (y == 5) {
        x = 10;
    } else {
        x = 15;
    }
    printf("Value of x is %d\n", x);
}

int main(int argc, char **argv) {
    f1();
    return 0;
}