标签：规则 ios draw 程序 com == lap nbsp play
part2 graph
void Graph::draw() { for(int i=1;i<=size;i++) { int p=size-i,m=2*i-1; while(p--) { cout<<" "; } while(m--) { cout<<symbol; } cout<<endl; } }
展示效果如下
part3 Fraction描述分数
1 #ifndef FRACTION_H 2 #define FRACTION_H 3 4 class Fraction { 5 public: 6 Fraction(int x = 0, int y = 1) : top(x), bottom(y) { if (bottom == 0) exit(0); }; 7 void show(); 8 void simplyFraction(); 9 friend Fraction addf(Fraction &a,Fraction &b); 10 friend Fraction minf(Fraction &a,Fraction &b); 11 friend Fraction mulf(Fraction &a,Fraction &b); 12 friend Fraction divf(Fraction &a,Fraction &b); 13 14 private: 15 int top; 16 int bottom; 17 }; 18 19 #endif
#include <iostream> #include "fraction.h" using namespace std; void Fraction::show() { if (bottom < 0) top = -top; if (top == 0) cout << 0 << endl; else if (bottom == 1) cout << top << endl; else cout << top << "/" << bottom << endl; } void Fraction::simplyFraction() { int m=1; for (int i = 2;i <= top&&i <= bottom;i++) { if (top%i == 0 && bottom%i == 0) m = i; } top = top / m; bottom = bottom / m; } Fraction addf(Fraction &a, Fraction &b) { Fraction aresult; aresult.top = a.top*b.bottom + b.top*a.bottom; aresult.bottom = a.bottom*b.bottom; aresult.simplyFraction(); return aresult; } Fraction minf(Fraction &a, Fraction &b) { Fraction minresult; minresult.top = a.top*b.bottom - b.top*a.bottom; minresult.bottom = a.bottom*b.bottom; minresult.simplyFraction(); return minresult; } Fraction mulf(Fraction &a, Fraction &b) { Fraction mulresult; mulresult.top = a.top*b.top; mulresult.bottom = a.bottom*b.bottom; mulresult.simplyFraction(); return mulresult; } Fraction divf(Fraction &a, Fraction &b) { Fraction dresult; dresult.top = a.top*b.bottom; dresult.bottom = a.bottom*b.top; dresult.simplyFraction(); return dresult; }
1 #include<iostream> 2 #include"fraction.h" 3 using namespace std; 4 int main() 5 { 6 Fraction a; 7 a.show(); 8 Fraction b(3, 4); 9 b.show(); 10 Fraction c(5); 11 c.show(); 12 addf(a, b).show(); 13 minf(a, c).show(); 14 mulf(b, c).show(); 15 divf(b, c).show(); 16 return 0; 17 }
总结
1在规则性显示时，要找到规律才能编写程序。
2在没有参数的赋值时，我写成了Fraction a()； 多了个小括号导致报错。
3最近看到this指针，不小心使用了this，却发现报错，类中函数this指针是自带的，似乎并不需要写。
标签：规则 ios draw 程序 com == lap nbsp play
原文地址：https://www.cnblogs.com/cwj0505/p/10742493.html
