新手小白求教循环判断异常处理

sundeam 发表于 2023-11-16 17:34

本帖最后由 sundeam 于 2023-11-17 09:52 编辑

各位大佬，我是c++菜鸟，今天遇到一个循环判断的问题，一直找不到原因，求指教。

#include<iostream>
#include <limits>
#include<random>
#include<ctime>
#include<cstdlib>

using namespace std;
int main()
{
intnum = 0; int a = 0; int b = 100; int c = 0; time_t t;
srand((unsigned)time(&t));
num = rand()%100;

   for (;;)
   {
         cout << "请输入" << a << "---" << b << "之间任意一个数值";
         cin >> c;
         if (num==c)
         {
            cout << "恭喜你答对了~！" << endl;
            a = 0; b = 100;
            num = rand() % 100;
         }
         if (num>c>a)
         {
            a = c;
         }
         if (b>c>num)
         {
            b = c;

         }

   }

每次循环到if (num>c>a)可以正常判断，执行完一次后，后面输入的数据就不判断了？

经过大佬的分享，完美解决判断异常问题，谢谢~！
下面附上修改后的
using namespace std;
int main()
{
intnum = 0; int a = 0; int b = 100; int c = 0; time_t t;
srand((unsigned)time(&t));
num = rand()%100;

   for (;;)
   {
         cout << "请输入" << a << "---" << b << "之间任意一个数值";
         cin >> c;
         if (num==c)
         {
            cout << "恭喜你答对了~！" << endl;
            a = 0; b = 100; c = 0;
            num = rand() % 100;
         }
         if (c < 0 && c>100)
         {
            cout << "你输入的数值超出范围，请重新输入：" << endl;
            c = 0;
         }
         if (num>c && c>a)
         {
            a = c;
         }
         if (b>c && c>num)
         {
            b = c;

         }

   }

无问且问 发表于 2023-11-16 18:14

c/c++语言没有连续大于这种写法，正确写法应该是num > c && c > a,b > c && c > num，在 c/c++ 中，符号 “>” 是一种用于比较两个值的运算符，它的含义是“大于”。该运算符用于比较两个操作数的大小关系，如果左操作数大于右操作数，则返回真（1），否则返回假（0）。

jishufanzi 发表于 2023-11-16 18:15

The given code snippet is a loop that continuously asks the user to enter a number between variables a and b. The loop will continue running until the user enters the correct number, indicated by if (num == c).

If the user guesses the correct number, a message "恭喜你答对了~！" will be displayed. Then, variables a and b are reset to 0 and 100 respectively, and a new random number is generated using num = rand() % 100.

If the user's guess is less than the correct number, the lower limit of the range, a, is updated to the guessed number using a = c.

If the user's guess is greater than the correct number, the upper limit of the range, b, is updated to the guessed number using b = c.

The loop will continue with the updated range until the correct number is guessed.

chao52 发表于 2023-11-16 18:19

楼上正解

Recalled123 发表于 2023-11-16 18:43

c/c++语言没有连续大于这种写法，，改成相应的写法即可

nyazhou 发表于 2023-11-16 18:50

无问且问发表于 2023-11-16 18:14
c/c++语言没有连续大于这种写法，正确写法应该是num > c && c > a,b > c && c > num，在 c/c++ 中，符号 “ ...

这样的写法编译之后会怎么运行啊，lz的程序过编译了

kof888 发表于 2023-11-16 19:10

判断写错了，不能这样判断

sai609 发表于 2023-11-16 19:22

不能这样判断，应该是

2783384895 发表于 2023-11-16 20:13

判断有错误得修改一下

ashortname 发表于 2023-11-16 22:47

这种连续大于或小于我只在python里写过，c/c++是没有这种写法的。这样写实际上相当于(a>b)>c，可以看看下面的输出：
std::cout << (4 > 3 > 2) << "" << (4 > 3 > -1) << std::endl;

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新手小白求教循环判断异常处理