To find the size of variable, sizeof operator is used.
sizeof(dataType);
Example: Find Size of a Variable
#include <iostream>
using namespace std;
int main()
{
cout << "Size of char: " << sizeof(char) << " byte" << endl;
cout << "Size of int: " << sizeof(int) << " bytes" << endl;
cout << "Size of float: " << sizeof(float) << " bytes" << endl;
cout << "Size of double: " << sizeof(double) << " bytes" << endl;
return 0;
}
Output
Size of char: 1 byte Size of int: 4 bytes Size of float: 4 bytes Size of double: 8 bytes
Note: You may get different result if you are using a old computer.