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tolower() not working correctly

ctaylor4874 (36)
Could someone please fill me in to why my tolower() is not working throughout my program? 

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// Input: Gets the necessary letters from user.
// Processing: Calcultes what color the user is typing in before its completely
// typed out
// Output: Outputs the digit that the color stands for.

#include <iostream>
#include <cmath>
#include <iomanip>
#include <cctype>
using namespace std;

const int RED_DIGIT = 2;
const int ORANGE_DIGIT = 3;
const int YELLOW_DIGIT = 4;
const int VIOLET_DIGIT = 7;
const int WHITE_DIGIT = 9;
const int BROWN_DIGIT = 1;
const int BLACK_DIGIT = 0;
const int BLUE_DIGIT = 6;
const int GRAY_DIGIT = 8;
const int GREEN_DIGIT = 5;

int main()
{
    char idColor; // first character
    char idColorTwo; // second character
    char idColorThree; // third character
    
    //Gets input from user
    cout << "Enter the first letter: " ;
    cin >> idColor;
    cout << endl;
    
    tolower(idColor);
   
    
    switch (idColor) {
           case 'r':
                cout << "Red stands for digit " << RED_DIGIT << "." << endl;
                break;
           case 'o':
                cout << "Orange stands for digit " << ORANGE_DIGIT << "." << endl;
                break;
           case 'y':
                cout << "Yellow stands for digit " << YELLOW_DIGIT << "." << endl;
                break;
           case 'v':
                cout << "Violet stands for digit " << VIOLET_DIGIT << "." << endl;
                break;
           case 'w':
                cout << "White stands for digit " << WHITE_DIGIT << "." << endl;
                break;
           case 'b':
                cout << "Enter the second letter: ";
                cin >> idColorTwo;
                cout << endl;
                tolower(idColorTwo);
                
                //nested switch statement
                switch (idColorTwo) {
                       case 'r':
                            cout << "Brown stands for digit " << BROWN_DIGIT << "." << endl;
                            break;
                            
                       case 'l':
                            cout << "Enter the third letter: ";
                            cin >> idColorThree;
                            cout << endl;
                                                    
                                 tolower (idColorThree);
                                 
                                 //nested switch statement
								 switch(idColorThree){
                                       case 'u':
                                            cout << "Blue stands for digit " << BLUE_DIGIT << "." << endl;
                                            break;
                                       case 'a':
                                            cout << "Black stands for digit " << BLACK_DIGIT << "." << endl;
                                            break;
                  default:
                     cout << "Unknown Error." << endl;     
                     }
                     break;            
                                          
          }                                                      
            break;
           case 'g':
                cout << "Enter the second letter: " ;
                cin >> idColorTwo;
                cout << endl;
                cout << "Enter the third letter: " ;    
                cin >> idColorThree;
                cout << endl << endl;
                
                tolower(idColorTwo);
                tolower(idColorThree);
                
                //nested switch statement
                switch (idColorTwo){
                       case 'r':
                                 //nested switch statement
								 switch (idColorThree){
                                        case 'a':
                                             cout << "Gray stands for digit " << GRAY_DIGIT << "." << endl;
                                             break;
                                        case 'e':
                                             cout << "Green stands for digit " << GREEN_DIGIT << "." << endl;
                                             break;
              default:
                  cout << "Unknown Error." << endl;                                             
           	}
           	break;
		   }                               
           break;                                  
          default:
                  cout << "Unknown Error." << endl;                             
}         
         
	
 cout << endl << endl;
 system ("PAUSE");
 
 return 0;
}
ctaylor4874 (36)
Do I have to do it like this, does tolower() not work within a switch statement?

switch (idColor) {
case 'r':
case 'R':
cout << "Red stands for digit " << RED_DIGIT << "." << endl;
break;
mlholder (77)
When you use a predefined character function to change the case of the character itself, you should put it in an assignment statement. In your case, I would do the following.

 
 
idColor = tolower(idColor);
ctaylor4874 (36)
Awesome, thank you so much!
andywestken (4087)
Or use

switch (tolower(idColor)) {

in which case the value returned by tolower() is passed directly to the switch.

mlholder's suggestion is better if you plan to check idColor multiple times.

Andy
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