c++_1

3.ratio類

 

#include <stdio.h> class Ratio { private: int num,den; public: Ratio(){num=1;den=1;}; Ratio(int a){num = a; den = a;}; Ratio(int a,int b){if(b==0)printf("are you fool!/n");num = a; den = b;}; void setnum(int a){num = a;} int setden(int b){if(b==0){printf("are you fool!/n");return 0;}den = b;return 1;} void print(){printf("the Ratio is:%d/%d/n",num,den);}; }; int main() { Ratio lratio(1,2); lratio.print(); int num,den; while(scanf("%d %d",&num,&den)!=EOF) { lratio.setnum(num); if(lratio.setden(den)) lratio.print(); else printf("woowowoow/n"); } return 0; }

Circle 類

#include <stdio.h> #include <math.h> #define PI 3.14159 #define PI2 PI*PI class CircleCal { private: double x,y; double radium,area,perimeter; double Dis(double,double); public: CircleCal(double a,double b,double c){x=a;y=b;radium = c;} void setr(double a){radium = a;} double Area(); double Perimeter(); void WheresthePoint(double,double); }; double CircleCal::Area() { return radium*PI2; } double CircleCal::Perimeter() { return 2*radium*PI; } double CircleCal::Dis(double xx,double yy) { return sqrt((x-xx)*(x-xx)+(y-yy)*(y-yy)); } void CircleCal::WheresthePoint(double xx,double yy) { double dis = Dis(xx,yy); if(dis<radium) { printf("in the circle!/n"); } else if(dis == radium) printf("on the circle!/n"); else printf("out!/n"); } int main() { double r; double x,y; scanf("%lf %lf %lf",&x,&y,&r); CircleCal circle(x,y,r); printf("%lf/n",circle.Area()); printf("%lf/n",circle.Perimeter()); while(scanf("%lf %lf",&x,&y)!=EOF) { circle.WheresthePoint(x,y); } return 0; }

 

 

 

1、編寫程序，求100以內的所有素數，並打印。

2、編寫函數，完成2個參數數值交換功能，並打印結果。要求程序可執行。

3、設計一個類，用於計算圓的面積、周長以及判定一個點與這個圓的位置關係。要求程序可執行。  設計一個類Ratio（分數類），類中存在兩個成員數據分子和分母（num，den）。設計其構造函數帶有初始化列表的，對於成員數據進行初始化（考慮成員函數重載問題），可以將分數類對象打印。