multiplu.cpp: In function `int main()': multiplu.cpp:30: warning: comparison between signed and unsigned integer expressions multiplu.cpp:34: warning: comparison between signed and unsigned integer expressions multiplu.cpp:42: warning: comparison between signed and unsigned integer expressions multiplu.cpp:48: warning: comparison between signed and unsigned integer expressions multiplu.cpp:55: warning: comparison between signed and unsigned integer expressions multiplu.cpp:62: warning: comparison between signed and unsigned integer expressions