Question

How to convert a character inside string to lowercase in C++

Answer 1

#include <iostream>
  
using namespace std;
  
string char_to_lowercase(string s, int idx) { 
    if (idx < 0 || idx > s.length()) return s;
             
    for (int i = 0; i < s.length(); i++) {
         if (i == idx && (s[i] >= 65 && s[i] <= 90)) {
             s[i] = tolower(s[i]);
         }
    }
    return s;
}
  
int main() {
    string s = "CPP PROGRAMMING"; 
      
    s = char_to_lowercase(s, 4);
    cout << s << endl;
      
    s = char_to_lowercase(s, 0);
    cout << s << endl;
       
    s = char_to_lowercase(s, s.length() - 1);
    cout << s << endl;
      
    return 0;
}
  
  
  
/*
run:
  
CPP pROGRAMMING
cPP pROGRAMMING
cPP pROGRAMMINg
  
*/

 

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