How to Replace All Occurrences of a Substring in a String in C++ - Step by Step Examples

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How to Replace All Occurrences of a Substring in a String in C++ ?

Answer

To replace all occurrences of a substring in a string in C++, you can use the std::string::replace method.

✐ Examples

1 Replacing Substring "Hello" with "Hi"

In this example,

We create a string named str.
We call the replace method on str with the substring to be replaced, the replacement string, and the starting position as arguments.
The replace method returns a new string with all occurrences of the substring replaced.
Finally, we print the modified string.

C++ Program

#include <iostream>
#include <string>

int main() {
    std::string str = "Hello World Hello";
    size_t pos = 0;
    while ((pos = str.find("Hello", pos)) != std::string::npos) {
        str.replace(pos, 5, "Hi");
        pos += 2; // Move past the replaced substring
    }
    std::cout << str << std::endl;
    return 0;
}

Output

Hi World Hi

2 Replacing Character 'o' with 'X'

In this example,

We create a string named str.
We iterate over each character in the string and replace 'o' with 'X'.
Finally, we print the modified string.

C++ Program

#include <iostream>
#include <string>

int main() {
    std::string str = "Hello World Hello";
    for (size_t i = 0; i < str.length(); ++i) {
        if (str[i] == 'o') {
            str[i] = 'X';
        }
    }
    std::cout << str << std::endl;
    return 0;
}

Output

HellX WXrld HellX

Summary

In this tutorial, we learned How to Replace All Occurrences of a Substring in a String in C++ language with well detailed examples.

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How to Replace All Occurrences of a Substring in a String in C++ - Step by Step Examples

How to Replace All Occurrences of a Substring in a String in C++ ?

Answer

✐ Examples

1 Replacing Substring "Hello" with "Hi"

C++ Program

Output

2 Replacing Character 'o' with 'X'

C++ Program

Output

Summary

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