视频02，识别数字并计算总和
void main()
{
cout<<"请输入任意长度的整数和空格数：";
int sum,c;
sum=0;
while(1)
{
cin>>c;
sum=sum+c;
if(getchar()=='\n')
{
break;
}
}
cout<<"输入所有数据之和sum="<<sum<<endl;
system("pause");
}
视频04 复制文件
void main()
{
ifstream in;
ofstream out;
string a;
char s;
in.open("D:\text1.txt");
out.open("D:\text2.txt");
while(!in)
{
cout<<"源文件打开失败，请重新输入路径：";
while(1)
{
cin>>a;
if(cin.peek()=='\n')
{
break;
}
}
in.open(a);
}
while(!out)
{
cout<<"目标文件失败，请重新输入路径：";
while(1)
{
cin>>a;
if(cin.peek()=='\n')
{
break;
}
}
out.open(a);
}
while(in>>s)
{
out<<s;
}
out<<endl;
in.close();
out.close();
system("pause");
}
视频06 函数重载，写了两种，1.是自己输入参数个数；2是程序计算输入参数个数，大于3个重新输入
1.
void main()
{
void calc(int a);
void calc(int a,int b);
void calc(int a,int b,int c);
int a,b,c,number;
cout<<"请输入参数个数number=";
cin>>number;
switch(number)
{
case 1:
cout<<"请输入a的值：";
cin>>a;
calc(a);
break;
case 2:
cout<<"请输入a和b的值：";
cin>>a>>b;
calc(a,b);
break;
case 3:
cout<<"请输入a、b和c的值：";
cin>>a>>b>>c;
calc(a,b,c);
break;
default:
cout<<"您的输入有错误!!!!!";
}
system("pause");
}
void calc(int a)
{
cout<<a<<"的平方是"<<a*a<<endl;
}
void calc(int a,int b)
{
cout<<a<<"*"<<b<<"="<<a*b<<endl;
}
void calc(int a,int b,int c)
{
cout<<a<<"+"<<b<<"+"<<c<<"="<<a+b+c<<endl;
}
2
void main()
{
void calc(int a);
void calc(int a,int b);
void calc(int a,int b,int c);
int a[100]={0},number,i;
cout<<"请输入需要计算的参数：";
for(i=0;i<100;i++)
{
cin>>a[i];
if(cin.peek()=='\n')
break;
}
number=i+1;
cout<<"number="<<number<<endl;
while(1)
{
if(number==1)
{
calc(a[0]);
break;
}
if(number==2)
{
calc(a[0],a[1]);
break;
}
if(number==3)
{
calc(a[0],a[1],a[2]);
break;
}
if((number<1)||(number>3))
{
cout<<"输入参数有误，请重新输入参数元素:";
for(i=0;i<100;i++)
{
cin>>a[i];
if(cin.peek()=='\n')
break;
}
number=i+1;
cout<<"number="<<number<<endl;
}
}
system("pause");
}