Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:16: warning: comparison between signed and unsigned integer expressions user.cpp:20: warning: comparison between signed and unsigned integer expressions user.cpp:27: warning: comparison between signed and unsigned integer expressions user.cpp:30: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:51: error: ‘strrev’ was not declared in this scope user.cpp:58: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:66: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:74: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:15: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result