C++小白学习笔记（8）

1、6人投票机制

复杂版：

#include
using namespace std;

int main(){
	int A = 0, B = 0, C = 0, D = 0, E = 0;
	int i, j;

	while(1)
	{	
		cout<<"****************"<<endl; 
		cout<<"Over the select?"<<endl;
		cout<<"Y:0          N:1"<<endl;
		cin>>j;
		if(j!=0&&j!=1){
			cout<<"WRONG"<<endl;
			break;
		}
			if(j)
			{
				cout<<"----------------"<<endl; 
				cout<<"Who?"<<endl;
				cin>>i;
				if(i>5||i<1){
				cout<<"WRONG"<<endl;
					break;
				}
				switch(i)
				{
					case 1:
						A++;
						break;
					
					case 2:
						B++;	
						break;
					
					case 3:
						C++;	
						break;
					
					case 4:
						D++;	
						break;
						
					case 5:
						E++;	
						break;
				}
			}
			else break;
	}
	cout<<"**********"<<endl; 
	cout<<"A = "<<A<<endl<<"B = "<<B<<endl<< "C = "<<C<<endl<< "D = "<<D<<endl<< "E = "<<E<<endl;
	//排序 
	return 0;
}

简易版：

#include
using namespace std;

int main(){
	int a[6] = {0};
	int vote;
	cin>>vote;
	while(vote){
		a[vote]++;
		cin>>vote;
	}
	for(int i = 0; i < 6; i++)
		cout<<a[i]<<"  ";
		
	return 0; 
}

2、身高分类问题：150以下、150~ 154、155 ~ 169、170 ~ 174、175 ~ 179、180以上

#include
using namespace std;

int mian(){
	int height, a[s] = {0};
	cin>>heigh;
	while(heigh){
		if(heigh < 150) a[0]++;
		else if(heigh > 179) a[7]++;
		else a[height/5 - 29]++;//数学问题，利用到“/”的特性“整除”
		cin>>heigh;
	}
	for(int i = 0; i <8; i++)
		cout<<a[i]<<" ";
	
	return 0;
}

3、求一本书的某一页之前页上各个数字出现的次数

#include
using namespace std;
void count(int*, int);

int main(){
	int page, a[10] = {0};
	cin>>page;
	count(a, page);
	for(int i = 0; i < 10; i++)
		cout<<i<<"的个数为: "<<a[i]<<endl;
	return 0;
} 
void count(int*a, int n){
	for(; n > 0; n--){
	int sum = n;
	int m;
	while(sum != 0){
		m = sum%10;			
		sum /= 10;
		a[m]++;
		} 	
	}
}