c++中stringstream如何應(yīng)用

stringstream是一個用于字符串操作的類，可以將各種數(shù)據(jù)類型轉(zhuǎn)換為字符串，也可以將字符串轉(zhuǎn)換為各種數(shù)據(jù)類型。下面是一些stringstream的常見用法:

1. 將各種數(shù)據(jù)類型轉(zhuǎn)換為字符串:

#include <iostream>
#include <sstream>

int main() {
    int num = 123;
    double value = 3.14;
    
    std::stringstream ss;
    ss << "Integer: " << num << ", Double: " << value;
    
    std::string str = ss.str();
    std::cout << str << std::endl;
    
    return 0;
}

2. 將字符串轉(zhuǎn)換為各種數(shù)據(jù)類型:

#include <iostream>
#include <sstream>

int main() {
    std::string str = "123 3.14";
    int num;
    double value;
    
    std::stringstream ss(str);
    ss >> num >> value;
    
    std::cout << "Integer: " << num << ", Double: " << value << std::endl;
    
    return 0;
}

3. 清空stringstream:

#include <iostream>
#include <sstream>

int main() {
    std::stringstream ss;
    ss << "Hello, World!";
    
    std::cout << ss.str() << std::endl;
    
    ss.str("");
    std::cout << ss.str() << std::endl; // Output is empty
    
    return 0;
}

4. 通過stringstream進(jìn)行格式化輸出:

#include <iostream>
#include <sstream>
#include <iomanip>

int main() {
    double value = 3.14159;
    
    std::stringstream ss;
    ss << std::fixed << std::setprecision(2) << value;
    
    std::string str = ss.str();
    std::cout << "Formatted Value: " << str << std::endl;
    
    return 0;
}

以上是stringstream的一些常見用法，可以根據(jù)實際需求靈活運用stringstream類進(jìn)行字符串操作。