Question

我的代码用于学校，旨在存储用户输入的汽车的速度，然后查找非超速驾驶者和超速驾驶者的平均速度（超过65的任何人都在超速驾驶）。我的问题是，每次运行此命令时，它只允许我输入一个速度，然后显示平均值，即速度本身。我正在寻找它来重复和存储值，直到输入“ -1”，这应该结束循环。谁能签出我的代码，请帮忙。

#include <stdlib.h>
#include <stdio.h>
void main(void)
{
int count1 = 0;
int count2 = 0;
double speed;
double speeders = 0;
double legals = 0;
double average1;
double average2;
int finished = 0;

while (finished != 1)
{
  printf("Enter a speed (or -1 to quit):\n");
  scanf("%lf", &speed);

  if (speed > 65)
 {
  printf("SPEEDING\n");
  speeders = speeders + speed;
  count1++;
  }
  else if (speed >= 0 && speed <= 65)
  {
  printf("OK\n");
  legals = legals + speed;
  count2++;
  }
  else (speed == -1)
 ;{
  finished = 1;
  }

}
  average1 = speeders / (double)count1;
  average2 = legals / (double)count2;
  printf("The average speed of the speeders is: %lf, and the average     speed of the non-speeders is: %lf\n", average1, average2);
}

Answer 1

此处的代码块：

else (speed == -1)
;{
finished = 1;
}

始终将finished设置为1。您需要：

else if(speed == -1)
{
    finished = 1;
}

或简单地：

else
{
    finished = 1;
}

Answer 2

您写道：

 else (speed == -1)
;{
 finished = 1;
 }

请注意错误的分号，并尝试在else上加条件！

就是这个：

else (speed == -1);
{
finished = 1;
}

…或者这个：

else
{
   (speed == -1);
}
{
   finished = 1;
}

…或者这个：

else
{
   speed == -1;
}
{
   finished = 1;
}

…或者这个：

else
{
   speed == -1;
}
finished = 1;

…或者这个：

else
{}
finished = 1;

…或者这个：

finished = 1;

换句话说，finished总是设置为1，并且您的else条件不起作用。

仔细检查语法并仔细阅读代码！

我的while循环不会在C程序中重复

2 个答案: