Compilare: user.cpp: In function ‘int main()’: user.cpp:123:23: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[10]’ [-Wformat=] scanf("%s",&op); ^ user.cpp:137:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(op[0]=='M'&&op[2]=='N') ^ user.cpp:142:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(op[0]=='M'&&op[2]=='X') ^ user.cpp:116:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zeap.in","r",stdin); ^ user.cpp:117:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zeap.out","w",stdout); ^ user.cpp:123:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&op); ^ user.cpp:125:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^ user.cpp:147:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n"); ^