Reverse in place in C

Reverses in place with two indices walking toward each other.

void reverse(char *s) {
    size_t len = strlen(s);
    for (size_t i = 0; i < len / 2; i++) {
        char tmp = s[i];
        s[i] = s[len - 1 - i];
        s[len - 1 - i] = tmp;
    }
}

Keywords and builtins used here

• char
• for
• reverse
• size_t
• void

The run, in numbers

Lines

8

Characters to type

152

Tokens

69

Three-star pace

100 tpm

At the three-star pace of 100 tokens a minute, this run takes about 41 seconds.

Type this snippet

Step 1 of 2 in Strings in memory, step 22 of 25 in Pointers & memory.

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