99乘法表.cpp

本程序用C++所编写.包含复数的运算.分数加减.99乘法表.矩阵转置和面积运算.

#include<iostream.h>
#include<iomanip.h>
void form1()
{ int i,j;
  cout<<"       1   2   3   4   5   6   7   8   9"<<endl;
  for (i=1;i<=9;i++) 
  { cout<<"   "<<i;
    for (j=1;j<=9;j++) 
    cout<<setw(4)<<(i*j);
	  cout<<endl;
	  
   }
}
void form2()
{ int i,j;
  cout<<"       1   2   3   4   5   6   7   8   9"<<endl;
  for (i=1;i<=9;i++)
   { cout<<"   "<<i;
     for (j=1;j<=i;j++)
	 cout<<setw(4)<<(i*j);
	   cout<<endl;
	  
	}
}
void form3()
{ int i,j;
  cout<<"       1   2   3   4   5   6   7   8   9"<<endl;
  for (i=1;i<=9;i++)
  { cout<<"   "<<i;
    for (j=1;j>=i-5&&j<=9;j++)
	cout<<setw(4)<<(i*j);
	  cout<<endl;
	  
	}
}
void main()
{ int n;
  menu:  cout<<"Please Select The Opinion:"<<endl
         <<"1: form1"<<endl<<"2: form2"<<endl<<"3: form3"<<endl<<"4:exit"
		   <<endl<<endl;
         cin>>n;
       switch(n)
	   {case 4:goto exit;break;
	    case 1:form1();break;
	    case 2:form2();break;
	    case 3:form3();break;
        default:cout<<"Select Error"<<endl;
		}
       goto menu;
exit:  n=4;
}