输入字符判断是字母或数字 问题.cpp

来自「我正在学习C编程」· C++ 代码 · 共 20 行

#include<stdio.h>   /**/
void main()
{
	
	printf("\n\tIutput a character输入一个字符(空格结束)做判断: \n\n");
	char c;
	printf("  输入一个字符: ");
	c=getchar();
	while(c!=' ')    //上一行和本行合成 while((c=getchar())!=' ')也行 (输入'空格'时结束)
	{if(c<32){printf("  This is a control character(控制字符)! \n");}
	else if(c>='0'&&c<='9'){printf("  This is a digit(数字字符)! \n");}
		 else if(c>='A'&&c<='Z'){printf("  This is a capital letter(大写字母)! \n");}
			  else if(c>='a'&&c<='z'){printf("  This is a small letter(小写字母)! \n");}
				   else {printf("  This is an other character(其他字符)! \n");}
	if(getchar()=='\n'){;}
	printf("\n  输入一个字符: ");    //一次只能输入一个字符,一次输入多个字符时出错?
	c=getchar();
	}
}