第五章作业

例5.1

#include<iostream>

using namespace std;

void display()

{
cout<<"This is an example."<<endl;

}

int main()

{

display();

return ;

}

例5.2

#include "stdafx.h"
#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;
 }

例5.3

#include "stdafx.h"
#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;

}

例5.4

#include "stdafx.h"
#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;

}

 

例题16

#include "stdafx.h"
#include<iostream>

using namespace std;
const N = 8;
long fibo(int n);

int main()
{
long f = fibo(N);
cout<<"Fibonacci数列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);

}

例25

#include"stdafx.h"
#include<iostream> 
using namespace std; 
int a; 
int power(int n); 
int 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); 
    cout<<"a="<<a<<"\tm"<<m<<"\td="<<d<<endl; 
    return 0; 
} 
extern int a; 
int power(int n) 
{ 
    int i,y=1; 
    for(i=1;i<=n;i++) 
        y*=a; 
    return y; 
}