msalem@ieng9:~$ less test2.c
#include <stdio.h>

int add(int x) {
    int y = 0;
    printf("x = %d, y = %d\n", x, y);
    return x + y;
}

int main() {
    char x[] = "\0\0\0\1\0\0\0\1";
    int (*ptr)(double y) = (int(*)(double y))add;
    printf("%d\n", (*ptr)(*(double*)x));
    return 0;
}
msalem@ieng9:~$ gcc -o test2 test2.c
msalem@ieng9:~$ ./test2
x = 1, y = 0
1