c++作业5

项目3 成绩

#include<iostream>
using namespace std;
int main()
{
	const int n=10;
	int score[n],a[n],b[n],max,min,j=0,k=0;
	double aver=0;
	cout<<"请输入十名学生的成绩：";
	for(int i=0;i<n;i++)
	{
		cin>>score[i];
		if(score[i]<0||score[i]>100)
		{
			cout<<"成绩输入错误，请重新输入"<<endl;
			cin>>score[i];
		}
	}
	max=score[0];
	min=score[0];
	{
		for( i=0;i<n;i++)
		{
			if(score[i]>max)
				max=score[i];
			if(score[i]<min)
				min=score[i];
			aver+=score[i];
		}
		for( i=0;i<n;i++)
		{
			if(score[i]==max)
			{
				a[j++]=i;
				
			}
			if(score[i]==min)
			{
				b[k++]=i;
			}
		}
		
		aver=aver/n;
		
		cout<<"该小组最高分为："<<max<<endl;
		cout<<"该小组最低分为："<<min<<endl;
		cout<<"该小组平均分为："<<aver<<endl; 
		cout<<"最高分的人数为："<<j<<endl;
		cout<<"最低分的人数为："<<k<<endl;
		cout<<"最高分的学号为：";
		for(i=0;i<j;i++)
			cout<<a[i]<<"  ";
		cout<<endl;
		cout<<"最低分的学号为：";
		for(i=0;i<k;i++)
			cout<<b[i]<<"  ";
		cout<<endl;
	}
	return 0;
}

项目四 字串符

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
	char str[50];
	int i=0,n=0,j=0,k=0,x=0;
	cout<<"输入字符串:";
	gets(str);
	while(str[i]!='\0')
	{
		if(str[i]>='0'&&str[i]<='9')
		{ n++;
		i++;}
		else if (str[i]>='A'&&str[i]<='Z')
        {j++;
		i++;}
		else if (str[i]>='a'&&str[i]<='z')
		{k++;
		i++;} 
		else {x++;
        i++;}
	}
	cout<<"数字个数: "<<n<<endl;
	
	cout<<"大写字母个数: "<<j<<endl;
	cout<<"小写字母个数: "<<k<<endl;
	cout<<"其它字符个数: "<<x<<endl;
	return 0;
}

 项目五 求和

#include<iostream>
using namespace std;
int main()
{
	int a[10],i,sum1=0,sum2=0;
	cout<<"请输入十个数：";
	for(i=0;i<10;i++)
	{
		cin>>a[i];
		if(a[i]>0)	
			sum1+=a[i];
		if(a[i]<0)	
			sum2+=a[i];	
	}
	
	cout<<"正数的和为："<<sum1<<endl;
	cout<<"负数的和为："<<sum2<<endl;
	return 0;
}