/in/foo.cc: In function 'void myPrint(int, int)':
/in/foo.cc:36:4: error: 'num' was not declared in this scope
    num++;
    ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:46:12: warning: unused variable 's' [-Wunused-variable]
    int A,B,s=0,i;
            ^
/in/foo.cc:46:16: warning: unused variable 'i' [-Wunused-variable]
    int A,B,s=0,i;
                ^