200. 구조체 포인터로 복리 잔액 계산

1#include <stdio.h>
2 
3struct Acct {
4    int year;
5    double bal;
6};
7 
8void grow(struct Acct *a, double rate) {
9    a->bal = a->bal * (1 + rate);
10    a->year++;
11}
12 
13int main() {
14    struct Acct ac = {0, 800.0};
15    for (int i = 0; i < 3; i++) {
16        grow(&ac, 0.25);
17    }
18    printf("%d %.2f\n", ac.year, ac.bal);
19    return 0;
20}