Compilare: user.cpp: In function 'void calc(int, int)': user.cpp:84: warning: comparison between signed and unsigned integer expressions user.cpp:84: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:130: warning: format '%s' expects type 'char*', but argument 3 has type 'char (*)[172]' user.cpp:135: warning: format '%s' expects type 'char*', but argument 3 has type 'char (*)[30]' user.cpp:141: warning: comparison between signed and unsigned integer expressions