how can i make this program to accept both upper and lower case id's. The id when read from file is of upper case.The id's present are in the form of S2345. Help please.
cout << "Enter client ID TO Change email"; cin >> ids; for(int i=0; i<rec; i++) if(client[i].ID == ids){ cout << "\nEnter New email\n"; cin >> client[i].email; } 
#include <boost/algorithm/string.hpp> #include <string> std::string str = "Hello World"; boost::to_upper(str); You can use std::transform() from #include <algorithm> library:
#include <algorithm> // for std::transform #include <functional> // for std::ptr_fun #include <cstring> // for std::toupper int main() { std::string ids; std::cout << "Enter client ID TO Change email"; std::cin >> ids; // make the entire string uppercase std::transform(ids.begin(), ids.end(), ids.begin() , std::ptr_fun<int, int>(std::toupper)); std::cout << ids << '\n'; } It may be worth making a function wrapper for it:
std::string to_uppercase(std::string s) { std::transform(s.begin(), s.end(), s.begin() , std::ptr_fun<int, int>(std::toupper)); return s; } References: std::transform, std::ptr_fun
