Proof: Call a function with missing parameters in C

//file lib.c:
#include<stdio.h>
void test(int a, int b) {
    printf("%d, %d\n", a, b);
}

//file main.c:
void test(int a); 
int main() {
    test(128);
}

//compile with `gcc -c -o lib.o lib.c; gcc lib.o main.c -o main`

//execute (each time we get a different output...):
./main 
128, -1103440664

./main 
128, 1346491064

So we are there:
https://raphlinus.github.io/assets/Anything_is_Possible_scaled.jpg