Eroare de compilare: user.c: In function ‘main’: user.c:30: warning: implicit declaration of function ‘strlen’ user.c:30: warning: incompatible implicit declaration of built-in function ‘strlen’ user.c:41: error: ‘m’ undeclared (first use in this function) user.c:41: error: (Each undeclared identifier is reported only once user.c:41: error: for each function it appears in.) user.c:46: error: ‘n’ undeclared (first use in this function) user.c:25: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:26: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:28: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result user.c:29: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result