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

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How to find the Index of Last Occurrence of Substring in C ?

Answer

To find the index of the last occurrence of a substring in C, you can use the strrchr function.

✐ Examples

1 Find Index of Last Occurrence in String

In this example,

We include the string.h header file for string manipulation functions.
We create a character array str with a string value.
We use the strrchr function to find the last occurrence of a specific character within str.
The strrchr function returns a pointer to the last occurrence of the character in the string.
Finally, we print the index.

C Program

#include <stdio.h>
#include <string.h>

int main() {
    char str[] = "Hello World, Hello C";
    char *lastIndex = strrchr(str, 'H');
    printf("Last index of substring is: %ld", lastIndex - str);
    return 0;
}

Output

Last index of substring is: 13

2 Find Index of Last Occurrence in Another String

In this example,

We include the string.h header file for string manipulation functions.
We create two character arrays str1 and str2 with different values.
We use the strrchr function to find the last occurrence of str2 within str1.
The strrchr function returns a pointer to the last occurrence of str2 in str1.
Finally, we print the index.

C Program

#include <stdio.h>
#include <string.h>

int main() {
    char str1[] = "apple banana cherry banana";
    char str2[] = "banana";
    char *lastIndex = strrchr(str1, str2[0]);
    printf("Last index of substring is: %ld", lastIndex - str1);
    return 0;
}

Output

Last index of substring is: 20

Summary

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

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

How to find the Index of Last Occurrence of Substring in C ?

Answer

✐ Examples

1 Find Index of Last Occurrence in String

C Program

Output

2 Find Index of Last Occurrence in Another String

C Program

Output

Summary

More C Strings Tutorials