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Материал из C\C++ эксперт
Variable size: int, short, long, char, float and double
#include <iostream>
int main()
{
std::cout << "The size of an int is:\t\t";
std::cout << sizeof(int) << " bytes.\n";
std::cout << "The size of a short int is:\t";
std::cout << sizeof(short) << " bytes.\n";
std::cout << "The size of a long int is:\t";
std::cout << sizeof(long) << " bytes.\n";
std::cout << "The size of a char is:\t\t";
std::cout << sizeof(char) << " bytes.\n";
std::cout << "The size of a float is:\t\t";
std::cout << sizeof(float) << " bytes.\n";
std::cout << "The size of a double is:\t";
std::cout << sizeof(double) << " bytes.\n";
return 0;
}The size of an int is: 4 bytes.
The size of a short int is: 2 bytes.
The size of a long int is: 4 bytes.
The size of a char is: 1 bytes.
The size of a float is: 4 bytes.
The size of a double is: 8 bytes.
