Compilare: user.cpp: In function 'void mut(long int)': user.cpp:15: warning: format '%d' expects type 'int', but argument 2 has type 'long int' user.cpp: In function 'int main()': user.cpp:26: warning: format '%ld' expects type 'long int*', but argument 2 has type 'int*' /tmp/ccsRVYmJ.o: In function `main': user.cpp:(.text+0x100): warning: the `gets' function is dangerous and should not be used.