题解 | #人民币转换#

#include <stdio.h>
#include <stdbool.h>
#include <math.h>
#define LEN 50

void get_bits(double d_n, int * ar);
void printInfo(int n, char number[][LEN]);

int main(void)
{
	double d_n;
	static int ar[5];
	bool flag = false;
	char number[13][LEN] = { {"零"}, {"壹"}, {"贰"}, {"叁"}, {"肆"}, {"伍"}, {"陆"}, {"柒"},
							 {"捌"}, {"玖"}, {"拾"}, {"佰"}, {"仟"} };
	char unit[6][LEN] = { {"亿"}, {"万"}, {"元"}, {"角"}, {"分"}, {"整"} };
	
	while (scanf("%lf", &d_n) == 1)
	{
		get_bits(d_n, ar);
		if (ar[0] || ar[1] || ar[2] || ar[3] || ar[4])
			printf("人民币"); 
		if (ar[4])
		{
			printInfo(ar[4], number);
			printf("%s", unit[0]);
			flag = true;
		}
		if (ar[3])
		{
			if (flag && ar[4] % 10 == 0)
				printf("%s", number[0]);
			printInfo(ar[3], number);
			printf("%s", unit[1]);
			flag = true;
		}
		if (ar[2])
		{
			if (flag && ar[3] % 10 == 0)
				printf("%s", number[0]);
			printInfo(ar[2], number);
			flag = true;
		}
		if (flag)
			printf("%s", unit[2]);
		if (ar[1])
			printf("%s%s", number[ar[1]], unit[3]);
		if (ar[0])
			printf("%s%s", number[ar[0]], unit[4]);
		if (!ar[1] && !ar[0] && flag)
			printf("%s", unit[5]);
	}
	
	return 0;
}

void get_bits(double d_n, int * ar)
{
	/* 分 */
	double temp = d_n * 100;
	ar[0] = (long long) round(temp) % 10;
	/* 角 */
	ar[1] = ((long long) round(temp) / 10) % 10;
	/* 元 */
	ar[2] = (long long) d_n % 10000;
	/* 万 */
	ar[3] = ((long long) d_n / 10000) % 10000;
	/* 亿 */
	ar[4] = (long long) d_n / 100000000;
}

void printInfo(int n, char number[][LEN])
{
	bool flag = false;
	
	if (n >= 1000)
	{
		printf("%s%s", number[n / 1000], number[12]);
		n %= 1000;
		flag = true;
	}
	if (n < 100 && n >= 10 && flag)
	{
		printf("%s", number[0]);
	}
	else if (n >= 100)
	{
		printf("%s%s", number[n / 100], number[11]);
		n %= 100;
		flag = true;
	}
	if (n < 10 && n > 0 && flag)
	{
		printf("%s", number[0]);
	}
	else if (n >= 10)
	{
		if (n / 10 == 1)
			printf("%s", number[10]);
		else
			printf("%s%s", number[n / 10], number[10]);
		n %= 10;
	}
	if (n > 0)
		printf("%s", number[n]);
}