Compilare: user.cpp: In function 'unsigned int calculate(unsigned int, int, int)': user.cpp:21: warning: comparison between signed and unsigned integer expressions user.cpp:21: warning: comparison between signed and unsigned integer expressions user.cpp:25: warning: comparison between signed and unsigned integer expressions user.cpp:25: warning: comparison between signed and unsigned integer expressions user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:49: warning: comparison between signed and unsigned integer expressions