C++作业5

#include <iostream>
using namespace std;
int main()
{
const int N=5;
int a
={1,2,3,4,5};
int i,sum1=0,sum2=0;
for(i=0;i<N;i++)
{

cin>>a[i];
if(a[i]>0)
{
sum1+=a[i];
}
else
{
sum2+=a[i];
}
}
cout<<"正数的和为"<<sum1<<endl;
cout<<"负数的和为"<<sum2<<endl;
return 0;
}

#include <iostream>
using namespace std;
int main()
{
int a[10],i=0,max=0,min=0,sum=0,j=0,k=1,m=0,n=0;
double average=0;
cout<<"请输入10个学生的成绩(0到100之间)"<<endl;
for (i=0;i<10;i++)
{
cin>>a[i];
}
max=a[0];
min=a[0];
for(i=1;i<10;i++)
{
if (a[i]>max)
max=a[i];
if (a[i]<min)
min=a[i];
}
cout<<"分数最高的为"<<max<<endl;
cout<<"分数最低的为"<<min<<endl;
for (i=1;i<10;i++)
{
if (max==a[i])
{
j=j+1;m=i;
}
}
cout<<"分数最高的同学的号数为"<<m+1<<endl;
for (i=1;i<10;i++)
{
if (min==a[i])
{
k++;n=i;
}
}
cout<<"分数最低的同学的号数为"<<n+1<<endl;
cout<<"分数最高的同学有"<<j<<"个"<<endl;
cout<<"分数最低的同学有"<<k<<"个"<<endl;
for (i=0;i<10;i++)
{
sum=sum+a[i];
}
average=sum/10.0;
cout<<"均值为"<<average<<endl;
return 0;
}

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