补回第五章的例题部分

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例题3

01.#include<iostream>     02.using namespace std;    03.double p(double);    04.  int main()    05.{    06.    double s = p(5.0);    07.    cout<<"面积为"<<s<<endl;    08.    return 0;    09.}    10.  double p(double r)    11.{    12.    double pi =3.14;    13.    double s =pi *r*r;    14.    return s;  }  15.4  16.#include<iostream>     17.using namespace std;    18.  int sum(int x,int y)    19.{    20.      int t;t=x+y;  21.      return t;}  22.  int main()  23.  {  24.      int a,b,c;  25.      a=15,b=20;  26.      c=sum(a,b);  27.      cout<<a<<"+"<<b<<"="<<c<<endl;  28.      return 0;  29.  }

例题4

01.#include<iostream>     02.using namespace std;    03.  int sum(int x,int y)    04.{    05.      int t;t=x+y;  06.      return t;}  07.  int main()  08.  {  09.      int a,b,c;  10.      a=15,b=20;  11.      c=sum(a,b);  12.      cout<<a<<"+"<<b<<"="<<c<<endl;  13.      return 0;  14.  }

例题7

01.#include<iostream>     02.using namespace std;    03.    04.int p(int x)    05.{  x=x*x;  06.return x;}  07.int main()  08.{int t=10;int s=p(t);  09.cout<<"t="<<t<<'\t'<<"p("<<t<<")="<<s<<endl;  10.      11.    return 0;    12.}

例题13

01.#include<iostream>     02.using namespace std;    03.    04.long f2(int);    05.long f1(int p)    06.{    07.    int k;    08.    long r;    09.    k=p*p;    10.    r= f2(k);    11.    return r;    12.}    13.  long f2(int q)    14.{    15.    long fact = 1;    16.    for(int i =1;i<=q;i++)    17.        fact *= i;    18.    return fact;    19.}    20.  int main()    21.{    22.    int i;    23.    long sum =0;    24.    for(i =2; i<=3;i++)    25.        sum += f1(i);    26.    cout<<"sum = "<<sum<<endl;    27.    return 0;    28.}

例题15

01.#include<iostream>     02.using namespace std;    03.    04.float F(int n);    05.  int main()    06.{    07.    int a;    08.    float p;    09.    cout<<"input an integer number:";    10.    cin>>a;    11.    p =F(a);    12.    cout<<a<<"! ="<<p<<endl;    13.   return 0;    14.}    15.  float F(int n)    16.{    17.    float fact;    18.    if(n == 0)    19.        fact = 1;    20.    else    21.      fact = n * F(n-1);    22.      return fact;    23.  }

例题20

01.#include<iostream>     02.using namespace std;    03.    04.    05.void sort(int);    06.void echoa();    07.  08.  09.nt a[5] ={6,3,9,8,2};    10.  int main()    11.{    12.    echoa();    13.    sort(5);    14.    echoa();    15.    return 0;    16.}    17.    18.void echoa()    19.{    20.    for(int i =0;i<5;i++)    21.    cout<<a[i]<<'\t';    22.    cout<<endl;    23.}    24.  void sort(int n)    25.{    26.    int i,j,min,temp;    27.    for(i =0;i<n-1;i++)    28.    {    29.        min =i;    30.        for(j=i+1;j<n;j++)    31.        if(a[j]<a[min])    32.         min = j;    33.        temp = a[i];a[i]=a[min];a[min]=temp;    34.    }  }

例题23

01.#include<iostream>     02.using namespace std;    03.    04. int f(int);  05. int main()  06. {  07.     int i,k;  08.     cout<<"输入一个非负整数：";  09.         cin>>k;  10.     for(i=1;i<=k;i++)  11.         cout<<i<<"!="<<f(i)<<endl;  12.     return 0;}  13. int f(int n)  14. {  15.     static int f=1;f=f*n;  16.     return f;  17. }

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