如何输入特定长度的字符串？

Question

Let's say I were to allow the user to input n . They would then be able to input a string that must have n characters. I don't want to use a loop because the string must be on one line.

Would there be a way to do this?

This format is what I would prefer.

int n;
cin >> n;

string test;
cin >> test[n];

Any help would be greatly appreciated:)

Answer 1

You could truncate whatever they input to the first n many characters.

#include <string>
#include <iostream>

int n;
std::cin >> n;

std::string test;
std::cin >> test;
test = test.substring(0, n);

You could also test the validity of their input, and prompt them to re-enter it if they enter too many characters.

int n;
std::cin >> n;

std::string test
do
{
    std::cin >> test;
}
while(test.length() > n)