Question

当我遇到一些问题时，为什么time1变量为零。在计算楼层之后。

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
int main()
{
   int curfl = 0, destfl, floor;
   int time1, high, speed;
   high = 3;
   speed = 5;
   while(1)
   {
       printf("Currently the elevator is at floor number = %d\n", curfl);
       printf("Enter the floor number between 0-25 : ");
       scanf("%d", &destfl);
       if(destfl > curfl)


       {
               floor = destfl - curfl;
                /*****************************/
               time1 = (floor * (high / speed));  //variable become zero here
               /*****************************/
               printf("Elevator will take %d second to reach %d (st, nd, rd) floor \n", time1, destfl);
               while(curfl != destfl)
               {
               Sleep(1000 * 3 / 5);
               curfl++;
               printf("You are at floor number %d \n", curfl);
           }
           printf("Door opening \n");
           Sleep(10000);
           printf("Door Closed\n");
       }
       else if(destfl > curfl)
       {
           floor = curfl - destfl;
           time1 = (floor * (3 / 5));
           printf("Elevator will take %d second to reach %d (st, nd, rd) floor \n", time1, destfl);
           while(curfl != destfl)
           {
               Sleep(1000 * 3 / 5);
               curfl--;
               printf("You are at floor number %d \n", curfl);
           }
           printf("Door opening \n");
           Sleep(10000);
           printf("Door Closed\n");
       }
       else{
           printf("You are the same floor. Please getout from the elevator \n");
       }
}
   // printf("Hello world!\n");
    return 0;
}

Answer 1

您正在进行整数计算。切换到处理分数的东西。

Answer 2

您正在进行整数除法。对整数进行算术运算时，结果也是整数。所以像整数土地中的1/3 = 0。所以当你做(high / speed)时，临时结果将是一个整数，如果答案是一些小数＆lt; 1，结果将截断为0。

要解决此问题，您应该将代码更改为使用float或double代替int。

Answer 3

计算time1如下：

int curfl = 0, destfl, floor;
int high;
float speed, time1;
................................
time1 = (floor * (high / speed));

它看起来像是嵌入式设备。所以不知道它是如何支持浮点运算的。如果它不支持，则拾取除法算法，声明如下类型：

struct myfloat{
   int precision;
   int exponent;
}

然后写一个除法函数，如：

struct myfloat * divide(int a, int b) /* gives result for a/b */

为什么变量time1变为零？

3 个答案: