How to find the lenght of the word in C++?

Question

We have some word, that we should identify the length of. How can I do that? Example INPUT: "hello" - without quotes; Example OUTPUT: 5

The answer in this case is simply to search, which doesn't make for a good question on SO. — underscore_d, Jan 05 '21 at 12:20
Things like this should be covered in any [decent C++ book](https://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list). Or you could do a quick search on the internet "C++ get length of string". — Lukas-T, Jan 05 '21 at 12:21
Does this answer your question? [How to get the number of characters in a std::string?](https://stackoverflow.com/questions/905355/how-to-get-the-number-of-characters-in-a-stdstring) — NotAProgrammer, Jan 05 '21 at 12:32

score 2 · Accepted Answer · answered Jan 05 '21 at 12:24

If input is contained in a std::string you can find the length as stated by Ravi. If it's a C string you find the length with

int len = strlen(INPUT);

In C/C++ upper case is normally used for constants so it's better to name the string input, not INPUT.

score 1 · Answer 2 · answered Jan 05 '21 at 12:30

1

string str;
cin>>str;
//use this
cout<<str.length();
//or use this
cout<<str.size();

both of them will work fine.

answered Jan 05 '21 at 12:30

Azahar Alam

score 0 · Answer 3 · answered Jan 05 '21 at 12:18

0

There is one function to find length in C++. You can try by using:

input.length()

Also remember, you need to include:

#include <iostream>
using namespace std;

answered Jan 05 '21 at 12:18

Ravi Khunt

1

You don't need to inlcude iostream to use `std::string`. And you shouldn't use `using namespace std;`, it's [bad practice](https://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice). – Lukas-T Jan 05 '21 at 12:25

score 0 · Answer 4 · answered Jan 05 '21 at 12:23

0

You can use input.length() or input.size().

Or you can use this simple loop.

 for (i = 0; str[i]; i++) 
        ; 
    cout << i << endl;

answered Jan 05 '21 at 12:23

ColonelBobby

2

Don't recommend newbies to roll their own version of standard functions. It it totally unnecessary. – underscore_d Jan 05 '21 at 12:32
2

That loop does what `std::strlen` does, but `std::string` is allowed to contain additional null-characters, so it's different from `std::string::length`. – Lukas-T Jan 05 '21 at 12:40

4 Answers4