Compilare: main.cpp: In function 'int main()': main.cpp:66:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for(i=0; i<c.size(); i++) | ~^~~~~~~~~ main.cpp:68:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | if(i>=a.size()) | ~^~~~~~~~~~ main.cpp:72:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 72 | if(i>=b.size()) | ~^~~~~~~~~~ main.cpp:82:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 82 | for(i=0; i<c.size(); i++) | ~^~~~~~~~~ main.cpp:146:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 146 | if(i==c.size()-1) | ~^~~~~~~~~~~~ main.cpp:231:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 231 | if(i==c.size()-1) | ~^~~~~~~~~~~~ main.cpp:51:9: warning: unused variable 'n' [-Wunused-variable] 51 | int n,i,j,val1,val2,val3,minim,maxim,t,op; | ^ main.cpp:51:13: warning: unused variable 'j' [-Wunused-variable] 51 | int n,i,j,val1,val2,val3,minim,maxim,t,op; | ^ main.cpp: In function 'int eval(int, int, int)': main.cpp:47:1: warning: control reaches end of non-void function [-Wreturn-type] 47 | } | ^