C++ Exercises: Replace all the lower-case letters of a given string with the corresponding capital letters

Last update on April 05 2025 13:31:07 (UTC/GMT +8 hours)

Replace Lowercase with Uppercase

Write a C++ program to replace all the lower-case letters in a given string with the corresponding capital letters.

Visual Presentation:

Sample Solution:

C++ Code :

#include <iostream> // Including input-output stream header file
#include <algorithm> // Including algorithm header for transform function
using namespace std; // Using the standard namespace

int main() {
    string text; // Declaring a string variable named 'text' to store user input

    getline(cin, text); // Getting a line of text input from the user

    // Using transform function to convert each character of the string to uppercase
    transform(text.begin(), text.end(), text.begin(), ::toupper);

    // Displaying the converted string in uppercase
    cout << text << endl;

    return 0; // Indicating successful completion of the program
}

Sample Output:

Sample Input 
the quick brown fox jumps over the lazy dog. 
sample Output
THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to convert all lowercase letters in a string to uppercase without using built-in string functions.
• Write a C++ program that reads a sentence and replaces lowercase letters with uppercase using pointer manipulation.
• Write a C++ program to convert a string from lowercase to uppercase and then count the number of changes made.
• Write a C++ program that converts lowercase letters to uppercase by iterating through the ASCII values and using conditional checks.

C++ Code Editor:

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