Question

到目前为止，这是我的代码：

while(bet > remaining_money || bet < 100)
    {
        cout << "You may not bet lower than 100 or more than your current money. Characters are not accepted." << endl;
        cout << "Please bet again: ";
        cin >> bet;
    }

它工作正常，但我试图弄清楚如果用户输入任何不是数字的东西，它如何循环。

当我按下一个字母或说出符号/符号时，代码就会中断。

Answer 1

我会使用import numpy as np import re with open('pc1.txt', 'r') as myfile: data = myfile.read() processor = re.findall(r"processor time : ([\d.]+)", data, re.IGNORECASE | re.DOTALL | re.MULTILINE) processor = [float(i) for i in processor] # we convert the matching list of strings to floats if processor: print (np.median(processor)) print (np.mean(processor)) memory = re.findall(r"memory\\%.*?: ([\d.]+)", data, re.IGNORECASE | re.DOTALL | re.MULTILINE) memory = [float(i) for i in memory] # we convert the matching list of strings to floats if memory: print (np.median(memory)) print (np.mean(memory)) boot_time = re.findall(r"BootTime ([\d]+)", data, re.IGNORECASE | re.DOTALL | re.MULTILINE) boot_time = [float(i) for i in boot_time] # we convert the matching list of strings to floats if boot_time: print (np.median(boot_time)) print (np.mean(boot_time))和std::getline来读取整行，然后只有在将整行转换为double时才会跳出循环。

std::string

Answer 2

使用功能

isdigit()

如果参数是十进制数字（0-9）
，则此函数返回true

别忘了

#include <cctype>

如何仅在C ++中创建用户输入数字？

2 个答案: