Question

编写程序，输入一个字符，输出这个字符及其ASCII值并输出前一个字符和后一个字符

Answer 1

char input;//声明字符变量用于接收输入input = getchar();//输入字符值putchar(input);//输出字符值printf("%d\n", input);//输出字符的ASCII编码putchar(input - 1);//输出前一个字符putchar(input + 1);//输出后一个字符

Answer 2

#include<iostream>
using
namespace
std;
void
main()
{
char
a;
cout<<"输入字符："<<endl;
cin>>a;
cout<<"当前字符的ASCII："<<(int)a<<endl;
cout<<"前字符："<<endl;
cout<<(char)((int)a-1)<<endl;
cout<<"后字符："<<endl;
cout<<(char)((int)a+1)<<endl;
}这个是C++写的，输入2个字符的话会出错的。

Answer 3

#include<iostream>
using namespace std;
void main()
{
char a;
cout<<"输入字符："<<endl;
cin>>a;
cout<<"当前字符的ASCII："<<(int)a<<endl;
cout<<"前字符："<<endl;
cout<<(char)((int)a-1)<<endl;
cout<<"后字符："<<endl;
cout<<(char)((int)a+1)<<endl;
}这个是C++写的，输入2个字符的话会出错的。

Answer 4

char ch;cin>>ch;
for(int i=0;;i++)
{
switch((int)ch){case 0: cout<<ch<<" "<<(int)ch<<" "<<(char)ch+1;break;
case 254:cout<<ch<<" "<<(int)ch<<" "<<(char)ch-1;break;
default:cout<<ch<<" "<<(int)ch<<" "<<(char)(ch-1)<<" "<<(char)(ch+1);break;}
cout<<endl;
cin>>ch;
}