C/C++输入带空格的字符串方法

1. scanf("%[^\n]",str)

char str[100];
scanf("%[^\n]",str);  //\n作为字符串输入的结束符
len = strlen(str);    //获取str长度, 该方法在<cstring>头文件中

2. getline()

a. cin.getline(接收字符串: str, 最大接收字符个数: count - 1('\0'), 结束字符: 默认为‘\0’);

#include <iostream>
#include <cstring>
using namespace std;
int main()
{
    char str[10];
    cout << "Input: ";
//    cin.getline(接收字符串: str, 最大接收字符个数: count, 结束字符: 默认为‘\0’);
    cin.getline(str, 10);
    cout << "Output: " << str << endl;
    cout << "Length: " << strlen(str) << endl;
}

b. getline(cin, str)

#include <iostream>
#include <string>
using namespace std;

int main()
{
    string str;
    cout << "Input: ";
    getline(cin, str);
    cout << "Output: " << str << endl;
    cout << "Length:" << str.size() << endl;
}

3. cin.get(str, max_size - 1('\0'))

#include <iostream>
#include <cstring>
using namespace std;

int main()
{
    char str[100];
    cout << "Input: ";
    cin.get(str, 10);
    cout << "Output: " << str << endl;
    cout << "Length:" << strlen(str) << endl;
}

4. gets_s(str)

该方法已不被PAT编译器支持

a.cpp: In function ‘int main()’:
a.cpp:10:17: error: ‘gets_s’ was not declared in this scope
     gets_s(input);

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;

int main()
{
    char str[100];
    cout << "Input: ";
    gets_s(str);
    cout << "Output: " << str << endl;
    cout << "Length:" << strlen(str) << endl;
}