Use string.length() to check the string's size : string size « string « C++ Tutorial

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C++ Tutorial » string » string size 
15.21.1.Use string.length() to check the string's size
#include <iostream>
#include <string>      // include for C++ standard string class
using namespace std;
int main()
{
  string stringA = "C++";
  string stringB = "Is Cool";

  cout << "Length of stringA = " << stringA.length() << endl;
  cout << "Length of stringB = " << stringB.length() << endl;

  return 0;
}
Length of stringA = 3
Length of stringB = 7
15.21.string size
15.21.1.Use string.length() to check the string's size
15.21.2.Display the size of a string
15.21.3.string.size()
15.21.4.string size grows
15.21.5.Display the maximum string length
15.21.6.Display the capacity of a string
15.21.7.Set the capacity of a string to 128.
15.21.8.string.size(), string.length, string.capacity(), string.max_size()
15.21.9.functions related to size and capacity
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