Question

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

Answer 1

#include <iostream>
 
using namespace std;
 
string char_to_uppercase(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] >= 'a' && s[i] <= 'z')) {
             s[i] -= 32;
         }
    }
    return s;
}
 
int main() {
    string s = "cpp programming"; 
     
    s = char_to_uppercase(s, 4);
    cout << s << endl;
     
    s = char_to_uppercase(s, 0);
    cout << s << endl;
      
    s = char_to_uppercase(s, s.length() - 1);
    cout << s << endl;
     
    return 0;
}
 
 
 
/*
run:
 
cpp Programming
Cpp Programming
Cpp ProgramminG
 
*/

 

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Answer 2

#include <iostream>

using namespace std;

string char_to_uppercase(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] = toupper(s[i]);
         }
    }
    return s;
}

int main() {
    string s = "cpp programming"; 
    
    s = char_to_uppercase(s, 4);
    cout << s << endl;
    
    s = char_to_uppercase(s, 0);
    cout << s << endl;
     
    s = char_to_uppercase(s, s.length() - 1);
    cout << s << endl;
    
    return 0;
}



/*
run:

cpp Programming
Cpp Programming
Cpp ProgramminG

*/

 

70+ SQL courses for beginners and professionals