独習C++ 改訂版日記 P.52 練習問題2.2 2.〜2.(こんなコードで良いのか？)
#include
#include
using namespace std;
class t_and_d {
time_t now_time;
public:
t_and_d(time_t _now_time);
void disp();
};
t_and_d::t_and_d(time_t _now_time)
{
now_time = _now_time;
}
void t_and_d::disp()
{
struct tm *tm = localtime(&now_time);
char *time_str = asctime(tm);
printf("%s\n", time_str);
}
int main()
{
time_t n = time(NULL);
t_and_d td(n);
td.disp();
return 0;
}
3.(こんなコードで良いのか？)
#include
using namespace std;
class box {
double height;
double width;
double breadth;
public:
box(double _height,
double _width,
double _breadth);
void vol();
};
box::box(double _height, double _width, double _breadth)
{
height = _height;
width = _width;
breadth = _breadth;
}
void box::vol()
{
printf("vol:%f\n", height * width * breadth);
}
int main()
{
box b(10.0, 20.0, 30.0);
b.vol();
return 0;
}
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