北理工复试上机答案

2000年
1 #include<iostream>
#include<stdio.h>
using namespace std;
void main()
{
int r[100];
int top=-1;
char ch;
cin>>ch;
while(ch!='\n')
{
top++;
r[top]=ch;
ch=getchar();
}
while(top>=0)
{
ch=r[top];
top--;
cout<<ch;
}
cout<<endl;
}
2#include<iostream>
using namespace std;
void main()
{
int a;
int b;
int c;
for(a=1;a<=4;a++)
for(b=1;b<=4;b++)
for(c=0;c<=9;c++)
if(a*100+b*10+c+100*b+c*10+c==532)
cout<<a<<' '<<b<<' '<<c<<endl;
}
3
#include<iostream>
using namespace std;
int SumOfElement(int m)
{
int sum=0;
for(int i=1;i<m;i++)
{
if(m%i==0)
sum+=i;
}
return sum;
}
void main()
{
int m,m1=0,m2=0;
int e[60];
int g[60];
int i=1,j=1;
for (m=2;m<=60;m++)
{
int k=SumOfElement(m);
if(m==k)
{
e[i++]=m;
m1++;
}
else
{
g[j++]=m;m2++;
}
}
cout<<"E:";
for(i=1;i<=m1;i++)
cout<<e[i]<<' ';
cout<<"G:";
for(j=1;j<=m2;j++)
cout<<g[j]<<' ';
cout<<endl;
}
4#include<iostream>
#include<stdio.h>
using namespace std;
#define SIZE 4
struct student
{
char name[30];
int age;
int result;
}stu[SIZE],out,out1;
void fsave()
{
FILE *fp;
if((fp=fopen("sf1.txt","wb"))==NULL)
{
cout<<"File Open Failed"<<endl;
exit(1);
}
for(int i=0;i<=3;i++)
{
if((fwrite(&stu[i],sizeof(struct student),1,fp))!=1)
{
cout<<"save failed"<<endl;
exit(0);
}
}
fclose(fp);
}
void main()
{
FILE *fp;
cout<<"请输入四个学生的姓名，年龄，成绩：格式为(姓名，年龄，成绩)"<<endl;
for(int i=0;i<=3;i++)
{
// cin>>stu[i].name>>stu[i].age>>stu[i].result;
scanf("%s%d%d",stu[i].name,&stu[i].age,&stu[i].result);
}
fsave();
fp=fopen("sf1.txt","rb");
cout<<"(姓名，年龄，成绩)"<<endl;
while(fread(&out,sizeof(out),1,fp))
printf("%s,%d,%d\n",,out.age,out.result);
fclose(fp);
for(i=0;i<=2;i++)
if(stu[i].result<stu[i+1].result)
{
strcpy(&out1,&stu[i]);
stu[i+1]=stu[i];
stu[i]=out1;
}
cout<<stu[1].name<<','<<stu[1].age<<','<<stu[1].result<<endl; }
2001
1#include<iostream>
using namespace std;
void main()
{
float x,y;
cin>>x;
if(x>=0&&x<2)
y=-x+2.5;
else if(x>=2&&x<4)
y=2-1.5*(x-3)*(x-3);
else if(x>=4&&x<6)
y=x/2-1.5;
else
{
cout<<"无此定义域!"<<endl;
exit(0);
}
cout<<y<<endl;
}
2#include<iostream>
using namespace std;
int Sum(int N);
void main()
{
int N,sum=0;
cin>>N;
if(N>=0)
sum=Sum(N);
else
sum=-Sum(-N);
cout<<"The sum is:"<<sum<<endl;
}
int Sum(int N)
{
int sum=0;
for(int i=N;i<=2*N;i++)
sum+=i;
return sum;
}
3#include<iostream>
using namespace std;
void main()
{
int N=1000;
while(N>=1000&&9*N<=10000)
{
int a,b,c,d;
a=N/1000;
b=(N%1000)/100;
c=(N%100)/10;
d=N%10;
if(9*N==d*1000+c*100+b*10+a)
cout<<N<<" ";
N++;
}
cout<<endl;
}
结果，1089。