How do you make a string lowercase (the easy way)? (C++) [duplicate]

Question

I am building a program that takes input, then detects to see it a specific thing was entered. After the line was entered,it should convert it to lowercase. But, I cannot figure out how. I have tried tolower(), but I cannot figure out what to put in the brackets. Here is the code:

#include <string> #include <sstream> #include <iostream> #include "stdafx.h" using namespace std; int main() { while (1) { string dir = "C:/"; string line; string afterPrint; string prompt = "| " + dir + " |> "; cout << prompt; cin >> line; stringstream ss(line); while (ss) { string command; ss >> command; command = ;// Command, but lowercase if (command == "cd") { string dir; if (ss >> dir) { cout << "changedir: " << dir << "\n"; string prompt = "| " + dir + " |> "; } } else if (command == "c:" || command == "c:\\" || command == "c:/") { cout << "Directory: " << dir << "\n"; } else { cout << "error\n"; } break; } } return 0; }

Help would be highly appreciated!

Paul Belanger · Accepted Answer · 2017-11-06 02:19:48Z

tolower works on single characters. Note that the documentation also states that non-alpha characters are passed through unmodified.

This also looks like a good location to use std::transform.

If you look in the examples for std::transform, there is an example of using std::toupper to transform a string. Try adapting that example for your needs.

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