String length

A C-string is a row of characters that ends with a hidden null terminator. Return how many characters come before it — basically writing strlen yourself. Walk an index forward until you reach the terminator, counting as you go.

Complete int str_len(const char *s) to return the length of the C-string s, without using strlen. Count characters until the null terminator.

/* Count the characters in s without strlen. Do not write main(). */
int str_len(const char *s) {
    return 0;   /* change this */
}

Click Run to see the output here.

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String length

String length

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