Question

How to implement the strrstr function in C

Answer 1

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

char* strrstr(const char* haystack, const char* needle) {
    char* result = NULL;
    char* current = strstr(haystack, needle);
    
    while (current) {
        result = current;
        current = strstr(current + 1, needle);
    }
    
    return result;
}

int main() {
    const char* str = "C#:C C++:Java:C: Python";
    
    char* p = strrstr(str, "C");
    
    printf("%s\n", p);

    return 0;
}



/*
run:

C: Python

*/

 

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