c++作业5

#include <iostream>
using namespace std;
int main()
{
const int n=4;
int a
={0},max=0,min=0,i,sum=0,j=0,k=0;
double ave;
cout<<"请输入十个同学的成绩（成绩在0到100之间）"<<endl;
for(i=0;i<n;i++)
{
cin>>a[i];
}
for(i=0;i<n;i++)
{
if(a[i]>100||a[i]<0)
{
cout<<"输入错误"<<endl;
return 0;
}
}
max=a[0];min=a[0];
for(i=0;i<n;i++)
{
if(a[i]>max)
max=a[i];
if(a[i]<min)
min=a[i];
sum=sum+a[i];
}
ave=sum/n;
cout<<"最高分为"<<max<<" "<<"最低分为"<<min<<"平均分为"<<ave<<endl;
cout<<"分数最高的同学学号为"<<endl;
for(i=0;i<n;i++)
{
if(a[i]==max)
{
j++;
cout<<i<<" ";
}
}
cout<<"\n最高分的人数"<<j<<endl;
cout<<"分数最低的同学学号为"<<endl;
for(i=0;i<n;i++)
{
if(a[i]==min)
{
k++;
cout<<i<<" ";
}
}
cout<<"\n最低分的人数"<<k<<endl;
return 0;
}

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

#include <iostream>
using namespace std;
int main()
{
const int n=10;
int a
={0};
int i,sumz=0,sumf=0;
cout<<"请输入十个整数：";
for(i=0;i<n;i++)
{
cin>>a[i];
if(a[i]>0)
sumz+=a[i];
else
sumf+=a[i];
}
cout<<"正数的和为"<<sumz<<"\n负数的和为"<<sumf<<endl;
return 0;
}