第七周作业

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例5.1

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

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;}

#include "stdafx.h"#include<iostream>using namespace std;double circleArea(double);int main(){double r;cout<<"请输入圆的半径r=\n";cin>>r;double area=circleArea(r);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5.5

#include "stdafx.h"#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<<endl;return 0;}

习题2

#include "stdafx.h"#include<iostream>  using namespace std;    long int power(int base,int exponent);    int main()  {         int base,exponent;      cout<<"请输入基数和其幂(用空格键隔开):"<<endl;      cin>>base>>exponent;      power(base,exponent);      cout<<base<<"的"<<exponent<<"次方为"<<power(base,exponent)<<endl;      return 0;  }    long int power(int base,int exponent)  {        for(int i=1,int s=1;i<=exponent;i++)          s=s*base;      return s;    }

习题3

#include "stdafx.h"#include<iostream>  using namespace std;    char *fac(int);    int main()  {         int a;      cout<<"请输入一个大于1正整数:"<<endl;      cin>>a;  if(a<=1){cout<<"输入有误，请重新输入！！"<<endl;cin>>a;cout<<fac(a)<<endl;}else    cout<<fac(a)<<endl;  }    char *fac(int x)  {       if(x==2)          return "这个数是素数";      for(int i=2;i<x;i++)          if(x%i==0)              return "这个数是合数";          else return "这个数是素数";      }

习题4

#include "stdafx.h"#include<iostream>  #include<math.h>  using namespace std;    int func(int);    int main()  {         int a;      cout<<"请输入一个正整数:"<<endl;      cin>>a;      cout<<a<<"的逆序数为:"<<func(a)<<endl;  return 0;}    int func(int x)    {      int a[50];      int i,n=0,s,sum,m;      while (x!=0)      {          i=x%10,          x=x/10,          a[n]=i,          n++;      }      m=n-1;      for(i=0,sum=0;i<n;i++)          sum+=a[i]*pow(10,m),m--;      return sum;    }

习题5

#include "stdafx.h"#include<iostream>  using namespace std;    char grade(int);int main(){int score;cout<<"请输入百分制的成绩分数:";cin>>score;char ch=grade(score);cout<<score<<"对应的等级为:"<<ch<<endl;return 0;}char grade(int n){char ch;if(n>=90&&n<100) ch='A';else if(n>=80) ch='B';    else if(n>=70) ch='C';else if(n>=60) ch='D';else ch='E';return ch;}

习题6

#include "stdafx.h"#include<iostream>  using namespace std;    float average();int main(){float aver=average();cout<<"平均成绩为:"<<aver<<endl;return 0;}float average(){float a[10],sum=0,average;cout<<"请输入10个学生的成绩:"<<endl;for(int i=0;i<10;i++){cin>>a[i];sum+=a[i];}average=sum/10;return average;}

习题8

#include "stdafx.h"#include<iostream>  using namespace std;  void mt1();void mt2();void mt3();int main(){ mt1();mt2();mt3();return 0;}void mt1(){cout<<"*******************"<<endl;for(int i=1;i<10;i++){for(int j=1;j<10;j++)cout<<j<<"*"<<i<<"="<<j*i<<'\t';cout<<endl;}}void mt2(){cout<<"*******************"<<endl;for(int i=1;i<10;i++){for(int j=1;j<i;j++)cout<<j<<"*"<<i<<"="<<j*i<<'\t';cout<<endl;}}void mt3(){cout<<"*******************"<<endl;for(int i=1;i<10;i++){for(int j=1;j<10;j++)if(j<i)cout<<'\t';elsecout<<j<<"*"<<i<<"="<<j*i<<'\t';cout<<endl;}}

作业三

#include "stdafx.h"#include<iostream>  #include<iomanip>  using namespace std;  void Matrix(int A[4][5],int B[5][3])  {      int i,j,k;      int c[4][3]={0},t=0;      for(i=0;i<4;i++)      for(j=0;j<3;j++)           for(k=0;k<5;k++)                  {  t=A[i][k]*B[k][j];                      c[i][j]+=t;                  }                 cout<<"这两个矩阵的乘积为："<<endl;  for(i=0;i<4;i++)        {            for(j=0;j<3;j++)                cout<<setw(8)<<c[i][j];            cout<<endl;        }    }    int main()  {      int A[4][5],B[5][3];      int i,k;      cout<<"请输入第一个A[4][5]矩阵的元素"<<endl;      for(i=0;i<4;i++)          for(k=0;k<5;k++)              cin>>A[i][k];      cout<<"请输入第二个矩阵B[5][3]的元素"<<endl;      for(i=0;i<5;i++)          for(k=0;k<3;k++)              cin>>B[i][k];      Matrix(A,B);      return 0;  }

作业四

#include "stdafx.h"#include<iostream>  #include<iomanip>  using namespace std; int N(int n){int a=1;for(n;n>1;n--) a*=n;return a;}int S(int n){int a,sum=0;for(a=1;a<=n;a++)sum+=N(n);return sum;}int main()  {      int n,Sn;  cout<<"若S[n]=1!+2!+3!+...n!"<<endl;    cout<<"则n=";      cin>>n;      Sn=S(n);      cout<<"时，S[n]="<<Sn<<endl;      return 0;  }

作业5

带小数的十六进不会弄。

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