5 Different Methods to Find Length of a String in C++

C++ Booleans

Last Updated : 27 Sep, 2022

The ISO/ANSI C++ Standard has added certain new data types to the original C++ specifications. They are provided to provide better control in certain situations as well as for providing conveniences to C++ programmers. A boolean data type is declared with the bool keyword and can only take the values in either true or false form. One of the new data types is bool.

Syntax:

bool b1 = true; // declaring a boolean variable with true value

In C++, as mentioned earlier the data type bool has been introduced to hold a boolean value, true or false. The values true or false have been added as keywords in the C++ language.

Important Points

1. The default numeric value of true is 1 and false is 0.

2. We can use bool-type variables or values true and false in mathematical expressions also. For instance,

int x = false + true + 6;

3. is valid and the expression on the right will evaluate to 7 as false has a value of 0 and true will have a value of 1.

4. It is also possible to convert implicitly the data type integers or floating point values to bool type.

Example:

bool x = 0; // false

bool y = 100; // true

bool z = 15.75; // true

The most common use of the bool datatype is for conditional statements. We can compare conditions with a boolean, and also return them telling if they are true or false.

Below is the C++ program to demonstrate bool data type:

C++

// C++ program to demonstrate  
// bool data type 
#include <iostream> 
using namespace std; 
  
// Driver code 
int main() 
{ 
  int x1 = 10, x2 = 20, m = 2; 
  bool b1, b2; 
    
  // false 
  b1 = x1 == x2;  
  
  // true 
  b2 = x1 < x2;  
  
  cout << "Bool1 is = " <<  
           b1 << "\n"; 
  cout << "Bool2 is = " <<  
           b2 << "\n"; 
  bool b3 = true; 
  
  if (b3) 
    cout << "Yes" << "\n"; 
  else
    cout << "No" << "\n"; 
  
  int x3 = false + 5 * m - b3; 
  cout << x3; 
  
  return 0; 
}

Output

Bool1 is = 0
Bool2 is = 1
Yes
9

5 Different Methods to Find Length of a String in C++

M

Mrigendra Singh

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