Compilare: user.cpp: In function ‘void compA(int)’: user.cpp:21:13: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok = 1, nrOp = 0; ^~ user.cpp: In function ‘int main()’: user.cpp:64:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &t); ^ user.cpp:68:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s + 1); ^