How to convert String to Uppercase in C++ - Step by Step Examples

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How to convert String to Uppercase in C++ ?

Answer

To convert a string to uppercase in C++, you can use the std::toupper() function from the cctype library.

✐ Examples

1 Uppercase of "Hello World" String

In this example,

We include the necessary header file cctype.
We declare a string named str1 with a value of "Hello World".
We then iterate over each character in str1 and convert it to uppercase using the std::toupper() function.
Finally, we print the modified str1.

C++ Program

#include <iostream>
#include <cctype>
#include <string>

int main() {
    std::string str1 = "Hello World";

    for (auto &ch : str1) {
        ch = std::toupper(ch);
    }

    std::cout << "Uppercase of given string is: " << str1 << std::endl;

    return 0;
}

Output

Uppercase of given string is: HELLO WORLD

2 Uppercase of "apple" String

In this example,

We include the necessary header file cctype.
We declare a string named str2 with a value of "apple".
We then iterate over each character in str2 and convert it to uppercase using the std::toupper() function.
Finally, we print the modified str2.

C++ Program

#include <iostream>
#include <cctype>
#include <string>

int main() {
    std::string str2 = "apple";

    for (auto &ch : str2) {
        ch = std::toupper(ch);
    }

    std::cout << "Uppercase of given string is: " << str2 << std::endl;

    return 0;
}

Output

Uppercase of given string is: APPLE

Summary

In this tutorial, we learned How to convert String to Uppercase in C++ language with well detailed examples.

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How to convert String to Uppercase in C++ - Step by Step Examples

How to convert String to Uppercase in C++ ?

Answer

✐ Examples

1 Uppercase of "Hello World" String

C++ Program

Output

2 Uppercase of "apple" String

C++ Program

Output

Summary

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