第七周作业1

调试书中例题

#include<iostream>
using namespace std;
void display()
{
cout<<"This is an example."<<endl;
}
int main()
{
display();
return 0;
}

 

#include<iostream>
using namespace std;
double min(double x,double y)
{
return x<y?x:y;
}
int main()
{
cout<<min(6.0,5.0)<<endl;
return 0;
}

 

#include<iostream>
using namespace std;
double circleArea(double);
int main()
{double area=circleArea(5.0);
cout<<"area="<<area<<endl;
return 0;
}
double circleArea(double r)
{double pi=3.14;
double area=pi*r*r;
return area;
}

#include<iostream>
using namespace std;
int sum(int x,int y)
{
int temp;
temp=x+y;
return temp;
}
int main()
{int a,b,c;
a=10;b=5;
c=sum(a,b);
cout<<a<<"+"<<b<<"="<<c<<endl;
return 0;
}

#include<iostream>
using namespace std;
int ncomp(int i,int j)
{
if(i>j)return 1;
if(i==j)return 0;
return -1;
}
int main()
{
int k=2;
int n=ncomp(k,k++);
cout<<n;
return 0;
}

#include<iostream>
using namespace std;
int max(int u,int v)
{
int w;
w=u>v?u:v;
return w;
}
int main()
{
int a,b,c;
cout<<"please intput two numbers:";
cin>>a>>b;
c=max(a,b);
cout<<"a="<<a<<"  b="<<b<<endl;
cout<<"Max is"<<" "<<c<<endl;
return 0;
}

#include<iostream>
using namespace std;
int sqr(int x)
{x=x*x;
return x;
}
int main()
{
int t=10;
int s=sqr(t);
cout<<"t="<<t<<'\t'
<<"sqr("<<t<<")="<<s<<endl;
return 0;
}

#include<iostream>
using namespace std;
void swap(int u,int v);
int main()
{
int a=3;
int b=4;
cout<<"a="<<a<<"\tb="<<b<<endl;
swap(a,b);
cout<<"a="<<a<<"\tb="<<b<<endl;
return 0;
}
void swap(int u,int v)
{
int temp;
temp=u;
u=v;
v=temp;
}

#include<iostream>
using namespace std;
void swap(int &u,int &v);
int main()
{
int a=3;
int b=4;
cout<<"a="<<a<<"\tb="<<b<<endl;
swap(a,b);
cout<<"a="<<a<<"\tb="<<b<<endl;
return 0;
}
void swap(int &u,int &v)
{
int temp;
temp=u;
u=v;
v=temp;
}

#include<iostream>
using namespace std;
void display(int x,int y)
{
cout<<x<<" "<<y;
return;
}
int main()
{
float a;
int b;
cin>>b>>a;
display(b,a);
return 0;
}

#include<iostream>
using namespace std;
long f2(int);
long f1(int p)
{
int k;
long r;
k=p*p;
r=f2(k);
return r;
}
long f2(int q)
{
long fact=1;
for(int i=1;i<=q;i++)
fact*=i;
return fact;
}
int main()
{
int i;
long sum=0;
for(i=2;i<=3;i++)
sum+=f1(i);
cout<<"sum="<<sum<<endl;
return 0;
}

#include<iostream>
#include<cmath>
using namespace std;

float f(float x); //求函数的值
float root(float x1,float x2); //求方程的根
float point(float x1,float x2); //求与x轴的交点

int main()
{
float x1,x2,y1,y2,x;
do
{
cout<<"请输入根所在的范围:";
cin>>x1>>x2;
y1=f(x1);
y2=f(x2);
cout<<"两端点的值为["<<y1<<","<<y2<<"]"<<endl;

}while(y1*y2>=0);
x=root(x1,x2);
cout<<"在"<<x1<<"与"<<x2<<"之间,方程的解为"<<x<<endl;

return 0;

}
float f1(float x)
{
return(x*x*x-4*x*x+6*x-10);
}
float root(float x1,float x2)
{
float y1,x,y;
y1=f(x1);
do
{
x=point(x1,x2);
y=f(x);
if(y*y1>0)
{
y1=y;x1=x;
}
else x2=x;
}while(fabs(y)>=0.0001);

return x;

}
float point(float x1,float x2)
{
float y;
y =(x1*f(x2)-x2*f(x1))/(f(x2)-f(x1));

return y;
}

#include<iostream>
using namespace std;

float Factorial(int n);
int main()
{
int a;
float f;
cout<<"input an integer number:";
cin>>a;
f=Factorial(a);
cout<<a<<"!= "<<f<<endl;

return 0;
}
float Factorial(int n)
{
float fact;
if(n==0)
fact=1;
else
fact =n*Factorial(n-1);

return fact;
}

#include<iostream>
using namespace std;

const N=8;
long fibo(int n);

int main()
{
long f=fibo(N);
cout<<"Fibonacci数列第8项的值为:"<<f<<endl;

return 0;
}
long fibo(int n)
{
if(n==1)return 1L;
else if(n==2)return 1L;
else
return fibo(n-1)+fibo(n-2);

}

#include<iostream>
using namespace std;

int i;            //文件作用域
int main()
{
i=5;           //给文件作用域的变量i赋值
{
int i;      //块作用域
i=7;
cout<<"内层i ="<<i<<endl;  //输出7
}
cout<<"外层i ="<<i<<endl;     //输出5

return 0;
}

#include<iostream>
using namespace std;

int i=1;
int main()
{
cout<<"i= "<<i<<endl;
int i=5;
cout<<"i= "<<i<<endl;
{
int i=7;
cout<<"i= "<<i<<endl;
cout<<"i= "<<::i<<endl;
}
cout<<"i= "<<i<<endl;
cout<<"i= "<<::i<<endl;

return 0;
}

#include<iostream>
using namespace std;

int max(int x,int y)
{
int z;
z=x>y?x:y;
return z;
}
int main()
{
extern int a,b;        //外部变量说明
cout<<max(a,b)<<endl;

return 0;
}
int a=13,b=-8;            //定义全局变量

#include<iostream>
using namespace std;

void sort(int);
void echoa();
int a[5] = {6,3,9,8,2};         //定义全局数组a

int main()
{
echoa();
sort(5);
echoa();

return 0;
}
void echoa()
{
for(int i=0;i<5;i++)
cout<<a[i]<<'\t';
cout<<endl;
}
void sort(int n)                //选择排序法
{
int i,j,min,temp;
for(i=0;i<n-1;i++)
{
min=1;
for(j=i+1;j<n;j++)
if(a[j]<a[min])
min=j;
temp=a[i];a[i]=a[min];a[min]=temp;
}

}

#include<iostream>
using namespace std;

int a=3,b=5;         //定义a,b全局变量

int main()
{
int a=8;          //a是局部变量
int c;
c=a>b?a:b;        //此时，a=8,b=5

cout<<c<<endl;

return 0;
}

#include<iostream>
using namespace std;

int f(int a)
{
auto int b=0;     //b为自动局部变量
static int c=3;   //c为静态局部变量
b++;
c++;
return (a+b-c);
}
int main()
{
int a=2,i;
for(i=0;i<3;i++)  //三次调用f函数
cout<<f(a)<<endl;

return 0;
}

#include<iostream>
using namespace std;

int fun(int);

int main()
{
int i,k;
cout<<"请输入一个非负整数:";
cin>>k;
for(i=1;i<=k;i++)
cout<<i<<"!="<<fun(i)<<endl;

return 0;

}
int fun(int n)
{
static int f=1;            //f为静态局部变量，每一次函数执行后i!的值都会保留
f=f*n;
return f;
}

#include<iostream>
using namespace std;

int fun(int);

int main()
{
int i,k;
cout<<"请输入一个非负整数:";
cin>>k;
for(i=1;i<=k;i++)
cout<<i<<"!= "<<fun(i)<<endl;

return 0;
}
int fun(int n)
{
register int i,f=1;
for(i=1;i<=n;i++)
f=f*i;
return f;
}

//文件file1.cpp
#include<iostream>
using namespace std;

int a;                    //全局变量
int power(int n);         //原型说明

int
9b54
main()
{
int b=3,c,d,m;
cout<<"enter a and m:"<<endl;
cin>>a>>m;
c=a*b;
cout<<"a= "<<a<<"\tb= "<<b<<"\tc= "<<c<<endl;
d=power(m);                                     //调用power函数，求a的m次方
cout<<"a= "<<a<<"\tm= "<<b<<"\td= "<<d<<endl;

return 0;

}
//文件file2,cpp
extern int a;

int power(int n)                 //该函数的功能是求a的n次方
{
int i,y=1;
for(i=1;i<=n;ti++)
y*=a;
return y;
}