C++作业5—数组选择/求和/字符串

#include<iostream>    
using namespace std;    
int main()   
{
    cout<<"输入十个数字";
	int a[10],b[10],i,j,k=0,flag;
	for(i=0;i<10;i++)
		cin>>a[i];
	for(i=0;i<10;i++)
	{
		flag=1;
		for(j=0;j<10;j++)
		{
			if(i==j)continue;
			if(a[i]==a[j])
			flag=0;
		}
		if(flag!=0)
			b[k++]=a[i];
	}
	cout<<"A的数组是";
	for(i=0;i<10;i++)
		cout<<a[i]<<" ";
	cout<<endl;
	cout<<"B的数组是";
	for(i=0;i<k;i++)
		cout<<b[i]<<" ";
	return 0;
}

#include<iostream.h>    
int main()   
{
    cout<<"输入十个数字";
	int a[10],sum1=0,sum2=0,i;
	for(i=0;i<10;i++)
	{
		cin>>a[i];
		if(a[i]>0)
			sum1=sum1+a[i];
		if(a[i]<0)
			sum2=sum2+a[i];
	}
	cout<<"十个数中所有正数之和是:"<<sum1<<endl;
	cout<<"十个数中所有负数之和是:"<<sum1<<endl;
}

#include<iostream>
#include<cstdio>    
using namespace std;    
int main()   
{
	char str[100];
	int i=0,m=0,n=0;
    cout<<"输入字符串:";
	gets(str);
	while(str[i]!='\0')
	{
		if(str[i]>='A'&&str[i]<='Z'||str[i]>='a'&&str[i]<='z')m++;
		if(str[i]>='0'&&str[i]<='9')n++;
		i++;
	}
	int a[10];
	cout<<"是数字的个数为:"<<m<<endl;
	cout<<"是字母的个数为:"<<n<<endl;
	cout<<"是其他字符的个数为:"<<i-m-n<<endl;
	return 0;
}