基于Visual C++2013拆解世界五百强面试题--题6-double类型逆序
请设计一个函数,不许用到字符串函数,用数学运算,将double类型数据转换,例如123.456转换成654.321
首先想到依次提取他的每一个位数,然后进行运算,移动每一位数到相应位置,结果相加就能逆序double数
下面上程序:
#include <stdio.h>
#include <stdlib.h>
#include <string.h> double ConvertDouble(double Val)
{
int leftLen=0, rightLen=0;
double leftVal, rightVal;
double convertVal = 0.0; //取左边整数和右边小数部分的值
leftVal = (double)(int)(Val);
rightVal = Val - leftVal; //获取整数部分长度,按题意等于小数部分长度
while (leftVal > 0.99)
{
leftVal /= 10;
leftLen++;
} for (int i = 1; i <= leftLen; i++)
{
leftVal = (int)Val;
int nTen = 1;
for (int j = 0; j < i; j++)
{
nTen *= 10;
} leftVal = (int)((leftVal / nTen) * 10)%10; //分别提取整数部分的每一位
convertVal += leftVal / nTen; //把整数部分倒到小数部分 rightVal = Val - (int)Val; //去掉整数部分
rightVal = (int)(rightVal*nTen) % 10; //分别提取每一位小数
convertVal += rightVal*nTen / 10; //把小数部分倒到整数部分
}
return convertVal;
} int main()
{
printf("%lf \n", ConvertDouble(1234.5678));
return 0;
}
运行结果如下图:
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" alt="" />
如果有什么问题和疑问可以在下面留言互相探讨。
原题我已经上传到这里了http://download.csdn.net/detail/yincheng01/6461073 ,
解压密码为 c.itcast.cn
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