Struct pointers in C

Mutating a struct through a pointer with ->.

struct Counter {
    int count;
    int step;
};

void advance(struct Counter *c) {
    c->count += c->step;
}

int current(const struct Counter *c) {
    return c->count;
}

How it works

1. A struct Counter * refers to a caller's struct.
2. c->count dereferences and selects a field.
3. A const pointer promises not to modify it.

Keywords and builtins used here

• Counter
• advance
• const
• current
• int
• return
• struct
• void

The run, in numbers

Lines

12

Characters to type

157

Tokens

49

Three-star pace

95 tpm

At the three-star pace of 95 tokens a minute, this run takes about 31 seconds.

Type this snippet

Step 2 of 3 in Structs, step 20 of 25 in Pointers & memory.

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