003--sizeof的使用

sizeof用于获取类型或变量的内存大小。可对类型名或变量使用sizeof。对类型（如int）使用sizeof运算符时，应该将名称放在括号中；但对变量名（n_short）使用该运算符，括号是可选的：

#include <iostream>
#include <climits>

int main(){
    using namespace std;
    int n_int=INT_MAX;
    short n_short=SHRT_MAX;
    long n_long=LONG_MAX;
    long long n_llong=LLONG_MAX;

    cout<<"int is "<<sizeof(int)<<" bytes."<<endl;
    cout<<"short is "<<sizeof n_short<<" bytes."<<endl;
    cout<<"long is "<<sizeof n_long<<" bytes."<<endl;
    cout<<"long long is "<<sizeof n_llong<<" bytes."<<endl;
    cout<<endl;

    cout<<"Maximum values:"<<endl;
    cout<<"int: "<<n_int<<endl;
    cout<<"short: "<<n_short<<endl;
    cout<<"long: "<<n_long<<endl;
    cout<<"long long: "<<n_llong<<endl;

    cout<<"Minimum int value:"<<INT_MIN<<endl;
    cout<<"Bits per byte: "<<CHAR_BIT<<endl;

    return 0;
}