Compilare: user.c: In function ‘ultim_cifr’: user.c:15: warning: unused variable ‘j’ user.c: At top level: user.c:23: warning: return type of ‘main’ is not ‘int’ user.c: In function ‘main’: user.c:41: warning: ‘return’ with a value, in function returning void user.c:27: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:28: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:29: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:32: warning: ignoring return value of ‘gets’, declared with attribute warn_unused_result /tmp/cc8LKJsY.o: In function `main': user.c:(.text+0x179): warning: the `gets' function is dangerous and should not be used.