C++ Type Data

Type data in c++

Type Keyword
Boolean bool
Character char
Integer int
Floating point float
Double floating point double
Valueless void
Wide character wchar_t

Modifier

Modifiers Type Description
signed convert numerics data to negative
unsigned convert numerics data to positive
short convert numerics data to low memory
long convert numerics data to high memory

this table shows the memory size store the value in memory

Type Typical Bit Width Typical Range
char 1byte -128 to 127 or 0 to 255
unsigned char 1byte 0 to 255
signed char 1byte -128 to 127
int 4bytes -2147483648 to 2147483647
unsigned int 4bytes 0 to 4294967295
signed int 4bytes -2147483648 to 2147483647
short int 2bytes -32768 to 32767
unsigned short int 2bytes 0 to 65,535
signed short int 2bytes -32768 to 32767
long int 8bytes -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
signed long int 8bytes -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
unsigned long int 8bytes 0 to 18,446,744,073,709,551,615
float 4bytes +/- 3.4e +/- 38 (~7 digits)
double 8bytes +/- 1.7e +/- 308 (~15 digits)
long double 8bytes +/- 1.7e +/- 308 (~15 digits)
wchar_t 2 or 4 bytes 1 wide character

For example

#include <iostream>
using namespace std;

int main() {
   cout << "Size of char : " << sizeof(char) << endl;
   cout << "Size of int : " << sizeof(int) << endl;
   cout << "Size of short int : " << sizeof(short int) << endl;
   cout << "Size of long int : " << sizeof(long int) << endl;
   cout << "Size of float : " << sizeof(float) << endl;
   cout << "Size of double : " << sizeof(double) << endl;
   cout << "Size of wchar_t : " << sizeof(wchar_t) << endl;
   return 0;
}

result

Size of char : 1
Size of int : 4
Size of short int : 2
Size of long int : 8
Size of float : 4
Size of double : 8
Size of wchar_t : 4

 

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