记得最开始 using System.Text.RegularExpressions; Regex m_regex = new System.Text.RegularExpressions.Regex("^(-?[0-9]*[.]*[0-9]{0,3})$"); bool b = m_regex.IsMatch("111"); if (b == false) { Co
文章转载自https://blog.csdn.net/Richard__Ting/article/details/80772174 判断是否为数字 #include <iostream> #include <iomanip> #include <string> #include <cctype> //判断字符类型需要的头文件 using namespace std; int main() { string str; int len; int n; int c
转载:https://blog.csdn.net/u013066244/article/details/53197756 用JAVA自带的函数 public static boolean isNumericZidai(String str) { for (int i = 0; i < str.length(); i++) { System.out.println(str.charAt(i)); if (!Character.isDigit(str.charAt(i))) { return fal