Hello sword4869/learn_cpp

# Booleans: bool

The keyword of boolean is bool, not itself.

If a Boolean value is assigned to an integer, true becomes 1 and false becomes 0.

int a = true;   // 1
int b = false;  // 0

If an integer value is assigned to a Boolean, 0 becomes false and any value that has a non-zero value becomes true.

bool c = -1;    // true
bool d = 0;     // false

# modifier

# integer

Several of the basic types, including integers, can be modified using one or more of these type modifiers:

  • signed: A signed integer can hold both negative and positive numbers.
  • unsigned: An unsigned integer can hold only positive values.
  • short: Half of the default size.
  • long: Twice the default size.
signed long int a;

// is equivalent to
long a;

# floating

Floating point data types are always signed, which means that they have the capability to hold both positive and negative values.

← pointer.md →