分数变小数

#include <cstdio>
#include <cstring>
using namespace std;
int div[105], remain[105], idx[1005];
bool cir;
void fracToDecimal(int a, int b) {
    printf("%d", a / b);
    if(a % b == 0) return;
    putchar('.');
    memset(idx, -1, sizeof idx);
    cir = false;
    a %= b;
    int cnt = 0;
    while(a) {
        a *= 10;
        div[cnt] = a / b;
        remain[cnt] = a % b;
        if(idx[remain[cnt]] != -1) {
            cir = true;
            int pos = idx[remain[cnt]];
            for(int i = 0; i < cnt; i++) {
                if(i == pos) putchar('(');
                putchar(div[i] + '0');
            }
            putchar(')');
            putchar('\n');
            break;
        }
        idx[remain[cnt]] = cnt;
        a = remain[cnt];
        cnt++;
    }
    if(!cir) {
        for(int i = 0; i < cnt; i++) putchar(div[i] + '0');
        putchar('\n');
    }
}
int main() {
    int a, b;
    while(scanf("%d%d", &a, &b), b) {
        fracToDecimal(a, b);
    }
    return 0;
}