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.
int num; std::cout << "请输入一个整数: "; std::cin >> num; if(std::cin.fail()) { std::cout << "输入错误!请输入一个整数。" << std::endl; std::cin.clear(); std::cin.ignore(std::numeric_limits<std::streamsize>::max(), ' '); // 清除输入缓冲区,避免死循环 } else { // 继续处理输入数据 }
int age; std::cout << "请输入您的年龄: "; std::cin >> age; if(age < 0 || age > 150) { std::cout << "年龄不合法!请重新输入。" << std::endl; } else { // 继续处理输入数据 }
#include <regex> std::string date; std::cout << "请输入日期(格式: yyyy-mm-dd): "; std::cin >> date; std::regex datePattern("^\d{4}-\d{2}-\d{2}$"); // 定义日期格式的正则表达式 if(!std::regex_match(date, datePattern)) { std::cout << "日期格式错误!请按照指定格式输入。" << std::endl; } else { // 继续处理输入数据 }
std::string name, email, password; std::cout << "请输入用户名: "; std::cin >> name; std::cout << "请输入邮箱: "; std::cin >> email; std::cout << "请输入密码: "; std::cin >> password; if(name.empty() || email.empty() || password.empty()) { std::cout << "信息不完整!请填写完整的信息。" << std::endl; } else { // 继续处理输入数据 }
try { // 可能会抛出异常的代码 } catch (const std::exception& e) { std::cout << "发生异常: " << 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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