sircifre.cpp: In function 'int main()': sircifre.cpp:28: warning: suggest parentheses around assignment used as truth value sircifre.cpp:38: warning: array subscript has type 'char' sircifre.cpp:22: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sircifre.cpp:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sircifre.cpp:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result sircifre.cpp:26: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccOv1gih.o: In function `main': sircifre.cpp:(.text+0xba): warning: the `gets' function is dangerous and should not be used.