c++实验报告

课程名称	C++与面向对象程序设计				实验项目名称
实验室名称及编号								实验日期
学生姓名				学号				专业班级
同组组员		无					机器编号或IP		***．***．***．***
一，实验目的和要求  1．理解和使用函数重载以及带默认参数的函数； 2．使用new和delete进行动态内存管理； 3．理解和使用引用。
二、实验环境（软、硬件及条件） 一台安装有Visual C++ 6.0的计算机
三，实验步骤 1．阅读下面的程序，写出程序的运行结果。 #include <iostream.h> int max_def(int x, int y) {       return (x>y?x:y); } int max_def(int x, int y, int z) {       int temp = 0;       return (temp=(x>y?x:y))>z?temp:z; } double max_def(double x, double y) {       return (x>y?x:y); } int main() {       int x1 = 0;       int x2 = 0;       double d1 = 0.0;       double d2 = 0.0;       x1 = max_def(5,6);       x2 = max_def(2,3,4);       d1 = max_def(2.1,5.6);       d2 = max_def(12.3,3.4,7.8);       cout<<"x1="<<x1<<endl;       cout<<"x2="<<x2<<endl;       cout<<"d1="<<d1<<endl;       cout<<"d2="<<d2<<endl;        return 0; }   该程序的运行结果是      x1=6                         x2=4                         d1=5.6                         d2=12                          2. 阅读下面的程序，写出程序的运行结果。 #include <iostream.h> void swap(int a, int b) {       int temp = a;       a = b;       b = temp; } void swap(int *a, int *b) {       int temp = *a;       *a = *b;       *b = temp; }   int main() {       int i = 5;       int j = 10;       cout<<"Before swap: i="<<i<<",j="<<j<<endl;       swap(i,j);       cout<<"After the first swap: i="<<i<<",j="<<j<<endl;       swap(&i,&j);       cout<<"After the second swap: i="<<i<<",j="<<j<<endl;       return 0; } 该程序的运行结果是   Before swap: i=5,j=10                      After the first swap: i=5,j=10                      After the second swap: i=10,j=5                             3.以下程序的功能是：      请输入9个整数:                            1 2 3 4 5 6 7 8 9                            the  product  is :362880                        # include <iostream.h> const int size=9;                                 int *init()                  //返回指针值的函数 {       return  new int[size];   //分配空间将首地址返回 } void readin(int *a)      //从a指向的存储单元开始读入数据 {       int i;       cout<<"请输入"<<size<<"个整数:"<<endl;       for (i=0;i<size;i++)         cin>>*(a+i);      //读入数据到a+i指向的存储单元 } void product(int *arr ,int  size,int *result)                       //计算从arr指向的存储单元开始的                       //连续size个存储单元的乘积 {   int m,i;       for (m=1,i=0;size>0;size--,i++)             m=m*(*(arr+i));       *result=m; //乘积的结果放入result指向的存储单元 } int main() {       int *x,res;       if ((x=init())==NULL)             return 1;       readin(x);       product(x,size,&res);       cout<<"the  product  is :"<<res<<endl;       delete[ ] x;       return 0;    } 3.设计一个函数：exchange(float x, float y, float z)，当调用exchange(a,b,c)时，将a的内容赋值给b，b的内容赋值给c，c的内容赋值给a，要求采用引用的方式来实现。 #include<iostream> using namespace std; float exchange(float &x,float &y, float &z) { float t; t=x; x=y; y=t; y=z; z=t; return x,y,z; } int main() { float a,b,c; cout<<" please inputa,b,c"<<endl; cin>>a; cin>>b; cin>>c; float &i=a; float &j=b; float &k=c; exchange(i,j,k); cout<<"交换后的值"<<a<<b<<c<<endl; return 0; } 4.编写重载函数max1可分别求取2个整数，3个整数，2个浮点数，3个浮点数的最大值。    #include<iostream> using namespace std; int max(int a,int b) {  return a>b?a:b; } int max(int a,int b,int c) {  return max(a,max(b,c)); } double max(double a,double b) {  return a>b?a:b; } double max(double a,double b,double c) {  return max(a,max(b,c)); } void main() {  int a,b,c;  double x,y,z;  cout<<"input three int:"<<endl;;  cin>>a>>b>>c;  cout<<max(a,b,c)<<endl;  cout<<max(a,b)<<endl;  cout<<"input three double:" <<endl;  cin>>x>>y>>z;  cout<<max(x,y,z)<<endl;  cout<<max(x,y)<<endl; }
四、实验中遇到的问题及解决 :\Users\周佳丽\Desktop\Microsoft Visual Studio(3)\Microsoft Visual Studio\Common\Cpp1.cpp(7) : error C2059: syntax error : ';' C:\Users\周佳丽\Desktop\Microsoft Visual Studio(3)\Microsoft Visual Studio\Common\Cpp1.cpp(13) : warning C4508: 'exchange' : function should return a value; 'void' return type assumed C:\Users\周佳丽\Desktop\Microsoft Visual Studio(3)\Microsoft Visual Studio\Common\Cpp1.cpp(19) : error C2440: 'initializing' : cannot convert from 'float *' to 'float'         There is no context in which this conversion is possible C:\Users\周佳丽\Desktop\Microsoft Visual Studio(3)\Microsoft Visual Studio\Common\Cpp1.cpp(20) : error C2440: 'initializing' : cannot convert from 'float *' to 'float'         There is no context in which this conversion is possible C:\Users\周佳丽\Desktop\Microsoft Visual Studio(3)\Microsoft Visual Studio\Common\Cpp1.cpp(21) : error C2440: 'initializing' : cannot convert from 'float *' to 'float'         There is no context in which this conversion is possible Error executing cl.exe.
实验结果及分析 <1>  x1=6 x2=4 d1=5.6 d2=12 <2> Before swap: i=5,j=10 After the first swap: i=5,j=10 After the second swap: i=10,j=5 <3> 请输入9个整数: 1 2 3 4 5 6 7 8 9 the  product  is :362880 <4> please inputa,b,c 4 7 8 交换后的值784 <5> input three int: 1 2 3 3 2 input three double: 3.2 7.2 2.1 7.2 7.2