How to input string in c++

There are two methods for string input in C: getline function, which reads the entire line of string, including spaces. cin >> operator, reads a single word or a space-delimited string.

String input in C

There are two ways to input strings through cin in C:

1. getline function

The getline function is used to read an entire line of strings from the standard input stream, including spaces. The syntax is as follows:

<code class="cpp">getline(cin, string_variable);</code>

Where:

• cin: standard input stream object
• string_variable: string variable that stores the input string

Example:

<code class="cpp">#include <iostream>
#include <string>

using namespace std;

int main() {
    string input_string;
    getline(cin, input_string);
    cout << "输入的字符串为：" << input_string << endl;
    return 0;
}</code>

Run the above code, prompt the user to enter a string, and then output the entered string.

2. cin >> operator

cin >> operator is used to read a single word or space-delimited characters from the standard input stream string. It ignores leading spaces until the first non-space character is encountered. The syntax is as follows:

<code class="cpp">cin >> string_variable;</code>

Where:

• cin: standard input stream object
• string_variable: string variable that stores the input string

Example:

<code class="cpp">#include <iostream>
#include <string>

using namespace std;

int main() {
    string input_string;
    cin >> input_string;
    cout << "输入的字符串为：" << input_string << endl;
    return 0;
}</code>

Run the above code to prompt the user to enter a word or space-delimited string, and then output the entered string.

Note:

• If the input string contains spaces, you need to use quotation marks to enclose the string when using the cin >> operator.
• If you need to read multi-line strings, you can use the getline function with a while loop.

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