How to perform data verification in C++ code?
Nov 04, 2023 pm 01:37 PM
How to perform data verification in C code?
When writing C code, data verification is a very important part. By verifying the data entered by the user, the robustness and security of the program can be enhanced. This article will introduce some common data verification methods and techniques to help readers effectively verify data in C code.
- Input data type check
Before processing the data input by the user, first check whether the type of the input data meets the requirements. For example, if you need to receive integer input from the user, you need to ensure that the user input is a legal integer. This can be checked using C's input stream object (std::cin) and the appropriate type variable.
int num;
std::cout << "請輸入一個(gè)整數(shù): ";
std::cin >> num;
if(std::cin.fail()) {
std::cout << "輸入錯(cuò)誤！請輸入一個(gè)整數(shù)。" << std::endl;
std::cin.clear();
std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '
');
// 清除輸入緩沖區(qū)，避免死循環(huán)
} else {
// 繼續(xù)處理輸入數(shù)據(jù)
}- Input data range check
In addition to checking the type of input data, you also need to check whether the input data is within a reasonable range. For example, for a certain numeric input, you need to make sure it is within a certain range. Range checking can be done using conditional statements or loop structures.
int age;
std::cout << "請輸入您的年齡: ";
std::cin >> age;
if(age < 0 || age > 150) {
std::cout << "年齡不合法！請重新輸入。" << std::endl;
} else {
// 繼續(xù)處理輸入數(shù)據(jù)
}- Data format check
Sometimes it is necessary to check the format of the input data to ensure the correctness and consistency of the data. For example, for date input, you can use regular expressions (regex) in the C standard library for format checking.
#include <regex>
std::string date;
std::cout << "請輸入日期(格式: yyyy-mm-dd): ";
std::cin >> date;
std::regex datePattern("^\d{4}-\d{2}-\d{2}$"); // 定義日期格式的正則表達(dá)式
if(!std::regex_match(date, datePattern)) {
std::cout << "日期格式錯(cuò)誤！請按照指定格式輸入。" << std::endl;
} else {
// 繼續(xù)處理輸入數(shù)據(jù)
}- Data integrity check
Before processing the data entered by the user, the integrity of the data needs to be checked to ensure that necessary data is not missing. For example, for form input, you need to ensure that all required fields are filled in.
std::string name, email, password;
std::cout << "請輸入用戶名: ";
std::cin >> name;
std::cout << "請輸入郵箱: ";
std::cin >> email;
std::cout << "請輸入密碼: ";
std::cin >> password;
if(name.empty() || email.empty() || password.empty()) {
std::cout << "信息不完整！請?zhí)顚懲暾男畔ⅰ?quot; << std::endl;
} else {
// 繼續(xù)處理輸入數(shù)據(jù)
}- Exception handling
When processing input data, if you encounter an abnormal situation (such as file read and write errors, memory allocation failure, etc.), you need to capture and handle the exception. to ensure the normal operation of the program.
try {
// 可能會(huì)拋出異常的代碼
} catch (const std::exception& e) {
std::cout << "發(fā)生異常: " << e.what() << std::endl;
}In summary, data verification of C code is very important and can be achieved through type checking, range checking, format checking, integrity checking and exception handling. Proper use of these verification methods can effectively improve the reliability and security of the program. I hope this article can provide some help to readers in data verification of C code.
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