a248: 新手訓練 ~ 陣列應用 FYI: https://yunlinsong.blogspot.com/2015/11/blog-post_7.html

a248.cpp

#include <cstdio>

int main() {
	int a, b, n;
	
    while(scanf("%d%d%d", &a, &b, &n) != EOF)
	{
		printf("%d.", a / b), a = a % b;
		for(int i = 0; i < n; i++)
		{
			a = a * 10,
			printf("%d", a / b),
			a = a % b;
		}
		
		printf("\n");
	}
    return 0;
}