How do I find the index of a character within a string in C?

Question

Suppose I have a string \"qwerty\" and I wish to find the index position of the e character in it. (In this case the index would be 2)

Answer 1

This should do it:

//Returns the index of the first occurence of char c in char* string. If not found -1 is returned.
int get_index(char* string, char c) {
    char *e = strchr(string, c);
    if (e == NULL) {
        return -1;
    }
    return (int)(e - string);
}