How to find the Index of Substring in C++ - Step by Step Examples

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How to find the Index of Substring in C++ ?

Answer

To find the index of a substring in C++, you can use the find method of the std::string class.

✐ Examples

1 Find Index of Substring in String

In this example,

We include the header.
We create a string variable named str with a string value.
We use the find method of str to find the index of a specific substring within str.
The find method returns the starting index of the substring in the string.
Finally, we print the index.

C++ Program

#include <iostream>
#include <string>

int main() {
    std::string str = "Hello World";
    size_t index = str.find("World");
    std::cout << "Index of substring is: " << index << std::endl;
    return 0;
}

Output

Index of substring is: 6

2 Find Index of Substring in Another String

In this example,

We include the header.
We create two string variables named str1 and str2 with different values.
We use the find method of str1 to find the index of str2 within str1.
The find method returns the starting index of str2 in str1.
Finally, we print the index.

C++ Program

#include <iostream>
#include <string>

int main() {
    std::string str1 = "apple banana cherry banana";
    std::string str2 = "cherry";
    size_t index = str1.find(str2);
    std::cout << "Index of substring is: " << index << std::endl;
    return 0;
}

Output

Index of substring is: 13

Summary

In this tutorial, we learned How to find the Index of Substring in C++ language with well detailed examples.

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How to find the Index of Substring in C++ - Step by Step Examples

How to find the Index of Substring in C++ ?

Answer

✐ Examples

1 Find Index of Substring in String

C++ Program

Output

2 Find Index of Substring in Another String

C++ Program

Output

Summary

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