78. 함수 포인터 배열로 연산 고르기

1#include <stdio.h>
2 
3int add(int a, int b) {
4    return a + b;
5}
6 
7int sub(int a, int b) {
8    return a - b;
9}
10 
11int mul(int a, int b) {
12    return a * b;
13}
14 
15int apply(int (*f)(int, int), int x, int y) {
16    return f(x, y);
17}
18 
19int main() {
20    int (*ops[3])(int, int) = {add, sub, mul};
21    int seq[5] = {2, 0, 1, 2, 0};
22    int acc = 1;
23    for (int i = 0; i < 5; i++) {
24        acc = ops[seq[i]](acc, i + 2);
25        printf("%d%c", acc, i < 4 ? ' ' : '\n');
26    }
27    printf("%d\n", apply(ops[1], 3, acc));
28    return 0;
29}