nr3.cpp: In function 'int main()': nr3.cpp:15: warning: comparison between signed and unsigned integer expressions nr3.cpp:17: warning: comparison between signed and unsigned integer expressions nr3.cpp:21: warning: comparison between signed and unsigned integer expressions nr3.cpp:23: warning: suggest parentheses around '&&' within '||' nr3.cpp:27: warning: comparison between signed and unsigned integer expressions nr3.cpp:31: warning: comparison between signed and unsigned integer expressions nr3.cpp:35: warning: comparison between signed and unsigned integer expressions nr3.cpp:39: warning: comparison between signed and unsigned integer expressions nr3.cpp:10: warning: unused variable 'c'