标签:cout int namespace c++ else 实验 using include
- 2—28 if…else
#include <iostream> using namespace std; int main() {char n; cout<<"Menu: A(dd) D(elete) S(ort) Q(uit), Select one: "; cin>>n; while(n!='Q') {if(n=='A') cout<<"Date has been added."<<endl; else if(n=='D') cout<<"Date has been deleted."<<endl; else if(n=='S') cout<<"Date has been sorted."<<endl; else if(n=='Q') break; cout<<"Menu: A(dd) D(elete) S(ort) Q(uit), Select one: "; cin>>n; } return 0; }
- 2—28 switch
#include <iostream> using namespace std; int main() {char n; cout<<"Menu: A(dd) D(elete) S(ort) Q(uit), Select one: "; cin>>n; while(n!='Q') {switch(n) {case 'A': cout<<"Date has been added."<<endl;break; case 'D': cout<<"Date has been deleted."<<endl;break; case 'S': cout<<"Date has been sorted."<<endl;break; case 'Q': break; } cout<<"Menu: A(dd) D(elete) S(ort) Q(uit), Select one: "; cin>>n; } return 0; }
- 2—29 do…while
#include <iostream> #include <cmath> using namespace std; int main() {int i=2,j,f,t=0; do {f=1; for(j=2;j<=sqrt(i);j++) if(i%j==0) {f=0;break;} if(f==1) cout<<i<<endl; i++; }while(i<100); return 0; }
- 2—29 for
#include <iostream> #include <cmath> using namespace std; int main() {int i,j,f,t=0; for(i=2;i<=100;i++) {f=1; for(j=2;j<=sqrt(i);j++) if(i%j==0) {f=0;break;} if(f==1) cout<<i<<endl; } return 0; }
- 2—29 while
#include <iostream> #include <cmath> using namespace std; int main() {int i=2,j,f,t=0; while(i<100) {f=1; for(j=2;j<=sqrt(i);j++) if(i%j==0) {f=0;break;} if(f==1) cout<<i<<endl; i++; } return 0; }
- 2—32 do while
#include <iostream> #include <ctime> #include <cstdlib> using namespace std; int main() {int guessNumber,n; srand(time(NULL)); guessNumber=rand()%100+1; cout<<"Your guess number is(1~100): "; cin>>n; do {if(n<guessNumber) {cout<<"Bigger than this,please enter a number: ";cin>>n;} else if(n>guessNumber) {cout<<"Smaller than this,please enter a number: ";cin>>n;} else if(n==guessNumber) {cout<<"Congratulations!You gussed it~";break;} cout<<endl; }while(1); return 0; }
- 2—32 while
#include <iostream> #include <ctime> #include <cstdlib> using namespace std; int main() {int guessNumber,n; srand(time(NULL)); guessNumber=rand()%100+1; cout<<"Your guess number is(1~100): "; cin>>n; while(1) {if(n<guessNumber) {cout<<"Bigger than this,please enter a number: ";cin>>n;} else if(n>guessNumber) {cout<<"Smaller than this,please enter a number: ";cin>>n;} else if(n==guessNumber) {cout<<"Congratulations!You gussed it~";break;} cout<<endl; } return 0; }
- 2—34 第一版
#include<iostream> using namespace std; enum ChoiceResult{red,yellow,blue,white,black}; int comm(int n,int k) {if(k>n) return 0; else if(n==k||k==0) return 1; else return comm(n-1,k)+comm(n-1,k-1); } int main() {int i,j,m; for(i=red;i<=black;i++) for(j=i+1;j<=black;j++) {if(i!=j) for(m=j+1;m<=black;m++) if((i!=m)&&(j!=m)) {switch(i) {case 0:{cout<<"red ";break;} case 1:{cout<<"yellow ";break;} case 2:{cout<<"blue ";break;} case 3:{cout<<"white ";break;} case 4:{cout<<"black ";break;} } switch(j) {case 0:{cout<<"red ";break;} case 1:{cout<<"yellow ";break;} case 2:{cout<<"blue ";break;} case 3:{cout<<"white ";break;} case 4:{cout<<"black ";break;} } switch(m) {case 0:{cout<<"red ";break;} case 1:{cout<<"yellow ";break;} case 2:{cout<<"blue ";break;} case 3:{cout<<"white ";break;} case 4:{cout<<"black ";break;} } cout<<endl; } } cout<<"C(5,3)="<<comm(5,3)<<endl; return 0; }
- 2—34 第二版
(第一版switch重复,参考书籍,用子函数来完成重复的操作)
#include<iostream> using namespace std; enum ChoiceResult{red,yellow,blue,white,black}; int comm(int n,int k) {if(k>n) return 0; else if(n==k||k==0) return 1; else return comm(n-1,k)+comm(n-1,k-1); } int result(int t) {switch(t) {case 0:{cout<<"red ";break;} case 1:{cout<<"yellow ";break;} case 2:{cout<<"blue ";break;} case 3:{cout<<"white ";break;} case 4:{cout<<"black ";break;} } } int main() {int i,j,m; for(i=red;i<=black;i++) for(j=i+1;j<=black;j++) {if(i!=j) for(m=j+1;m<=black;m++) if((i!=m)&&(j!=m)) {result(i);result(j);result(m);cout<<endl;} } cout<<"C(5,3)="<<comm(5,3)<<endl; return 0; }
实验小结:
1、第2—32题,查阅了无所不知的度娘,我学会了随机数的编写。
2、学习了新知识,也不能忘记了以前学习过的小细节,比如在编写第2—28题时,我忘记了字符常量要使用单引号。
3、第2—34题,参考课本P75-76,学习了用递归法计算组合数。
3、编程是一个日积月累的过程,只有通过自己的实际操作,才能知道自己的不足和错误之处。
标签:cout,int,namespace,c++,else,实验,using,include 来源: https://www.cnblogs.com/jyf13/p/10524238.html
本站声明: 1. iCode9 技术分享网(下文简称本站)提供的所有内容,仅供技术学习、探讨和分享; 2. 关于本站的所有留言、评论、转载及引用,纯属内容发起人的个人观点,与本站观点和立场无关; 3. 关于本站的所有言论和文字,纯属内容发起人的个人观点,与本站观点和立场无关; 4. 本站文章均是网友提供,不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属;如您发现该文章侵犯了您的权益,可联系我们第一时间进行删除; 5. 本站为非盈利性的个人网站,所有内容不会用来进行牟利,也不会利用任何形式的广告来间接获益,纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。