opmult.cpp: In function 'int main()': opmult.cpp:12: warning: format '%c' expects type 'char*', but argument 2 has type 'int*' opmult.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result opmult.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result opmult.cpp:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result opmult.cpp:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result opmult.cpp:15: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccaEPCKY.o: In function `main': opmult.cpp:(.text+0xa0): warning: the `gets' function is dangerous and should not be used.