Question

How to use String.indexOf function in C

Answer 1

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

// char *strstr(const char *haystack, const char *needle)

int indexOf(char* source, char* search) {
    char* found = strstr(source, search); 
    
    if (found != NULL) {
        return found - source;  
    }
    
    return -1;
}

int main() {
    char* source = "c c++ java python c#";    
    char* search = "java";
    
    printf("%d\n", indexOf(source, search));
    
    printf("%d\n", indexOf(source, "xy"));

    return 0;
}



/*
run:

6
-1

*/

 

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