if-if0.cpp

在c环境下的对数据结构进行讲解,包含有例题及答案

 //if-if0.cpp
 #include <iostream.h>							//cout,cin
 #include <conio.h>							//getch()
 void main()
 { char ch;
   do
     { cout << "输入任意字符:"; cin >> ch;
       if ((ch>='0'&&ch<='9')||(ch>='A'&&ch<='Z')||(ch>='a'&&ch<='z')) 
										//真:数字及字母
       { if ((ch>='A'&&ch<='Z')||(ch>='a'&&ch<='z'))	//真:大小写
         { cout << ch << " 为字母字符\n";
           if (ch>='A'&&ch<='Z')					//判断大写
           cout << ch << " 为大写字母";				//真
           else
           cout << ch << " 为小写字母";				//假
         }
         else cout << ch << " 为数字字符";			//假:数字
         cout << " ,内码为" << int (ch) << endl; 		//将ch转换为整数
       }
       else cout << ch << " 为特殊字符\n";			//假:特殊字符
       cout << "再输入吗?(y/n)";  cin >> ch;
     }while (ch!='n');
 }