During a class we started learning C, all of the tasks that I was given I managed to do expect when the scanf tasks came, after I couldn't make it work, I copied the code from the professor and I still couldn't make it work. I am using vs code, code runner extension and gcc on ubuntu linux.

Here is the code:

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

int main()
 {
    int a, b;
    scanf("%d", &a);
    scanf("%d", &b);
    printf("Zbir je %d\n", a b);
    return 0;
}

Here is the output, it does not stop untill I press the stop button: