C++作业5

1.#include<iostream.h>
int main()
{
const int N=10;
int a
,b
,c
,i,j=0,k=0,s1=0,s2=0;
for(i=0;i<N;i++)
9c84

{
cin>>a[i];
if(a[i]>0)
{
c[j]=a[i];
j++;
}
else
{
b[k]=a[i];
k++;
}
}
cout<<"负数的和为:\n";
for(i=0;i<k;i++)
s1+=b[i] ;
cout<<s1<<endl;
cout<<"正数的和为:\n";
for(i=0;i<j;i++)
s2+=c[i];
cout<<s2<<endl;
}
2.#include<iostream.h>
#include<cstdio>
using namespace std;
int main()
{
char str[50];
int i=0,n=0,j=0,m=0;
cout<<"输入字符串:";
gets(str);
while(str[i]!='\0')
{
if (str[i]>='0'&&str[i]<='9')
n++;
else if (str[i]>='a'&&str[i]<='z'||str[i]>='A'&&str[i]<='Z')
m++;
else j++;
i++;
}
cout<<"其中的数字个数是: "<<n<<endl;
cout<<"其中的字母个数是: "<<m<<endl;
cout<<"其中的其它字符个数是: "<<j<<endl;
}
3.#include<iostream.h>
int main()
{
int a[10],sum1=0,sum2=0,i;
cout<<"请输入十个数字："<<endl;
for(i=0;i<10;i++)
{
cin>>a[i];
if(a[i]>0)
sum1=a[i]+sum1;
else
sum2=a[i]+sum2;
}
cout<<"数组中正数的和:"<<sum1<<endl;
cout<<"数组中负数的和:"<<sum2<<endl;
}