secvsir.cpp: In function `void sir(int)': secvsir.cpp:14: warning: assignment to non-pointer type `char' from NULL secvsir.cpp:14: warning: argument to non-pointer type `char' from NULL secvsir.cpp: In function `int main()': secvsir.cpp:24: warning: assignment to non-pointer type `char' from NULL secvsir.cpp:24: warning: argument to non-pointer type `char' from NULL secvsir.cpp:21: warning: unused variable `int num' secvsir.cpp:21: warning: unused variable `int j' secvsir.cpp:34:2: warning: no newline at end of file