3_4.cpp

c++书籍的源代码

#include<iostream.h>
 int main()
{
 void print(char ch);
 char ch;
 do
 {
   cout<<"请输入一个字母！"<<endl;
   cin>>ch;
 }while(!(ch>='A'&&ch<='Z'||ch>='a'&&ch<='z'));
 print(ch);
 return(0);
}
 void print(char ch)
{
 int i,j,k;
 char c,d;
 if(ch>='A'&&ch<='Z')
  c='A';
 else 
  c='a';
 k=ch-c+1;
 for(i=1;i<=k;i++)
 {
   for(j=1;j<=k-i;j++)
	cout<<" ";
   for(j=1;j<=i;j++)
   {
    d=c+j-1;
	cout<<d;
   }
   for(j=i-1;j>=1;j--)
   {
    d=c+j-1;
	cout<<d;
   } 
   cout<<endl;
 }
}