Changing a capital letter (read from cin) to lower case?

Question

i wanna change the capital cin to lower case for the input , for example if cin>> one one=R it should be r so it convert it automatically

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Answer 1

You can write your code using transform:

string one;
string two;
cout << "\nPlayer One, please enter your move: ('p'  for Paper, 'r' for Rock, '" << std::endl;
cin >> one;

std::transform(one.begin(), one.end(), one.begin(), ::tolower);
cout <<"\nPlayer Two, please enter your move: ('P' for Paper, 'R' for Rock, 'S'" << std::endl;
cin >> two;
std::transform(two.begin(), two.end(), two.begin(), ::tolower);
std::cout << "one=" << one << " ; two=" << two << std::endl;

The output may be as follows (for R, P):

Player One, please enter your move: ('p'  for Paper, 'r' for Rock, '
R

Player Two, please enter your move: ('P' for Paper, 'R' for Rock, 'S'
P
one=r ; two=p

Answer 2

the transform is the right way to do it, i think, you just need to include the algorithm library

#include <ctype>
#include <algorithm>
#include <string>

std::transform(one.begin(), one.end(), one.begin(), ::tolower); 
std::transform(two.begin(), two.end(), two.begin(), ::tolower);

Answer 3

You should store your character in variable and change the variable

#include <cctype>
#include <iostream>

using namespace std;
int main ()
{
    char one{};
    char two{};
cout << "\nPlayer One, please enter your move: ('p'  for Paper, 'r' for Rock, '$
cin >> one;
one = tolower(one);

cout <<"\nPlayer Two, please enter your move: ('P' for Paper, 'R' for Rock, 'S'$
cin >> two;
one = tolower(two);

Answer 4

In header file " ctype.h" there are functions which supports case formatting

such as : tolower(var) formats text to lower case, toupper(var) formats text to upper case

Answer 5

Try:

#include <ctype>

tolower(char)

For a string input, you'll have to convert character by character:

char str[]="ONE TWO\n";
char c;
int i=0;
while (str[i])
{
  c=str[i];
  str[i] = (char) tolower(c);  //I think it return an int, which you need to typecast to a char
  i++;
}