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环境：Dev-C++( Version:5.6.1)
1.循环输入一个1-1000的整数，判断是否为素数(输入1时程序结束)
素数：只能被1和自身整除.
实现代码：
#include <iostream> #include <cstdlib> #include <cassert> using namespace std; /* *function name:isPrimeNumber. *precondition:parameter value is more than zero and less than or equal one thousand. *postcondition:return true when parameter value is prime number. */ bool isPrimeNumber(const int &number); int main() { while(true) { int number; cout<<"please input a integer number(0-1000):"<<endl; cin>>number; //condition assert(number>0&&number<=1000); if(number == 1) { break; } bool flag; flag = isPrimeNumber(number); if(flag) { cout<<"yes, the number is prime number."<<endl; } else { cout<<"no, the number is not prime number."<<endl; } } return EXIT_SUCCESS; } bool isPrimeNumber(const int &number) { for(int i=2;i<number/2+1;i++) { if(number%i == 0) { return false; } } return true; }
2.用类来实现输入和输出时间（时：分：秒）
要求：将数据成员改为私有；将输入和输出的功能有成员函数实现；在类体内定义成员函数
代码实现：
（对于时间输入的合理性，简单的采用断言assert函数来进行处理，不合理，程序直接结束运行）
#include <iostream> #include <cstdlib> #include <cassert> using namespace std; class Time { public: void set_time(Time &time) { cout<<"hour(0-23):"<<endl; cin>>time.hour; assert(time.hour>0&&time.hour<24); cout<<"minute(0-59):"<<endl; cin>>time.minute; assert(time.minute>0&&time.minute<60); cout<<"second(0-59):"<<endl; cin>>time.sec; assert(time.sec>0&&time.sec<60); } void show_time(const Time &time) { cout<<time.hour<<":"<<time.minute<<":"<<time.sec<<endl; } private: int hour; int minute; int sec; }; int main() { Time t; t.set_time(t); t.show_time(t); return EXIT_SUCCESS; }
3.在上题的基础上进行修改：在类体内声明成员函数，而在类外定义成员函数
代码实现：
1 #include <iostream> 2 #include <cstdlib> 3 #include <cassert> 4 using namespace std; 5 class Time 6 { 7 public: 8 void set_time(Time &time); 9 void show_time(const Time &time); 10 private: 11 int hour; 12 int minute; 13 int sec; 14 }; 15 void Time::set_time(Time &time) 16 { 17 cout<<"hour(0-23):"<<endl; 18 cin>>time.hour; 19 assert(time.hour>0&&time.hour<24); 20 21 cout<<"minute(0-59):"<<endl; 22 cin>>time.minute; 23 assert(time.minute>0&&time.minute<60); 24 25 cout<<"second(0-59):"<<endl; 26 cin>>time.sec; 27 assert(time.sec>0&&time.sec<60); 28 } 29 void Time::show_time(const Time &time) 30 { 31 cout<<time.hour<<":"<<time.minute<<":"<<time.sec<<endl; 32 } 33 int main() 34 { 35 Time t; 36 t.set_time(t); 37 t.show_time(t); 38 return EXIT_SUCCESS; 39 }
4.求三个长方柱的体积
实现代码：
1 #include <iostream> 2 #include <cstdlib> 3 #include <cassert> 4 using namespace std; 5 class Box 6 { 7 public: 8 Box(int l,int w,int h); 9 double volume() 10 { 11 return length*width*height; 12 } 13 private: 14 double length; 15 double width; 16 double height; 17 }; 18 /* 19 *precondition:parameters must be number. 20 *postcondition:null 21 */ 22 Box::Box(int l,int w,int h) 23 { 24 length = l; 25 width = w; 26 height = h; 27 } 28 int main() 29 { 30 cout<<"please enter the length, width and height of a rectangle:"<<endl; 31 int l,w,h; 32 cin>>l>>w>>h; 33 assert(l>0&&w>0&&h>0); 34 35 Box box(l,w,h); 36 cout<<"box volume:"<<box.volume()<<endl; 37 return EXIT_SUCCESS; 38 }
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原文地址：http://www.cnblogs.com/damon-sf/p/4918287.html
