stalpi2.cpp: In function 'int main()': stalpi2.cpp:40: warning: comparison between signed and unsigned integer expressions stalpi2.cpp:41: warning: comparison between signed and unsigned integer expressions stalpi2.cpp:43: warning: comparison between signed and unsigned integer expressions stalpi2.cpp:45: warning: comparison between signed and unsigned integer expressions stalpi2.cpp:22: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result stalpi2.cpp:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result stalpi2.cpp:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result stalpi2.cpp:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result stalpi2.cpp:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result