How to get number of characters in a string in c++

Question

What is the syntax for getting the value of the number of characters in a string.

Answer 1

C++ string class has a length function which returns number of characters in a string.

For example
int main() {
string a = "Hello world";
int b = a.length();
cout << b;
return 0;
}
output : 11

Answer 2

string a = "Hello world";
int b = a.length();
b = 11

Answer 3

#include <string>

string s = "Hello";
cout << s.size();

5

Answer 4

#include <iostream>
using namespace std;

int main() {
char s[] = "Hello World";
cout <<sizeof(s);
return 0;
}
// out put : 12

Answer 5

It depends whether you are using STL or not. If you are using String STL,i.e., #include <string>, the way to go would be :

string str = "sentence";
length = str.length();
cout<<length;
// Output - 8

But, if you are not using STL, and declaring string the traditional way, then the method would be :

char str[ ] = "sentence";
length = sizeof(str) - 1;
cout<<length;
// Output - 8

We subtract 1 from sizeof(string) because every string is terminated by a Null character, hence, it uses an extra byte.

Answer 6

There are many ways

Answer 7

you can use length() function for your string

Answer 8

Loop through the string one chat at a time and increment counter. Do NOT trim spaces. 🤔

Answer 9

// The simplest way (no methods/functions used)!

#include <iostream>
using namespace std;

int main() {
std::string str = "Hello!";
int i;
for(i = 0; str[i] != '\0'; i++); // notice this semicolon and '\0' is null char which terminates any C++ string!
std::cout << "Length=" << i;

return 0;
}

// Works for char str[] = "Hello!" too!