C++项目练习（1）

#include

#include

int main(void) {

      float r;

      float len;

      float s;

      std::cout << "请输入半径：";

      std::cin >> r;

      len = 2 * 3.14 * r;

      s = 3.14 * r * r;

      std::cout.precision(2);

      std::cout.flags(std::cout.fixed);

      std::cout << "周长是：" << len << std::endl;

      std::cout << "面积是: " << s << std::endl;

      system("pause");

      return 0;

}

#include

#include

using namespace std;

int main(void) {

      unsigned  boyAge;

      unsigned girlAge;

      unsigned diff;

      cout << "美女，多大了?" << endl;

      cin >> girlAge;  //输入25

      cout << "帅哥，多大了?" << endl;

      cin >> boyAge;  //输入22

      diff = girlAge - boyAge;

      cout << "美女比帅哥大" << diff <<"岁" << endl;

      diff = boyAge - girlAge;

      cout << "帅哥比美女大" << diff << "岁" << endl;

      system("pause");

      return 0;

}

unsigned short boyAge2 = boyAge;

      unsigned short girlAge2 = girlAge;

      unsigned short diff2 = boyAge2 - girlAge2;

      cout << "帅哥比美女大" << diff2 << "岁" << endl; //输出65533