do while in C

The loop that always runs once, which suits menus and retry loops.

int digits_in(int n) {
    int digits = 0;
    do {
        digits++;
        n /= 10;
    } while (n != 0);
    return digits;
}

int sum_until_zero(const int *values, int max) {
    int total = 0;
    int i = 0;
    do {
        total += values[i];
    } while (++i < max && values[i] != 0);
    return total;
}

How it works

1. The condition is tested after the body, not before.
2. It needs a trailing semicolon after the while.
3. Even for zero the digit count comes out as one.

Keywords and builtins used here

• const
• digits_in
• do
• int
• return
• sum_until_zero
• while

The run, in numbers

Lines

17

Characters to type

253

Tokens

91

Three-star pace

85 tpm

At the three-star pace of 85 tokens a minute, this run takes about 64 seconds.

Type this snippet

Step 4 of 7 in Operators & flow, step 11 of 35 in Language basics.

← Previous Next →