1137: encrypted medical record

Method 1 ：

#include<string.h>
#include<iostream>
using namespace std;
int main()
{
	char a[500];
	char b[500];
	char c[500];
	cin.getline(a,500);
    for(int i=0;i<strlen(a);i++)
    {
    	if(a[i]=='x')
    	{
    		b[i]='a';
		}
		else if(a[i]=='y')
		{
			b[i]='b';
		}
		else if(a[i]=='z')
		{
			b[i]='c';
		}
		else if(a[i]=='X')
		{
			b[i]='A';
		}
		else if(a[i]=='Y')
		{
			b[i]='B';
		}
		else if(a[i]=='Z')
		{
			b[i]='C';
		}
		else
		{
			b[i]=a[i]+3;
		}
		
    }
    for(int i=0;i<strlen(a);i++)
    {
    	c[i]=b[strlen(a)-1-i];
	}
	for(int i=0;i<strlen(a);i++)
	{
		if(c[i]>=65&&c[i]<=90)
		{
			c[i]=c[i]+32;
		}
		else
		{
			c[i]=c[i]-32;
		}
	}
	for(int i=0;i<strlen(a);i++)
	{
		cout<<c[i];
	}
	return 0;
 }

Method 2 ： use switch...case

#include<string.h>
#include<iostream>
using namespace std;
int main()
{
	char a[500];
	char b[500];
	char c[500];
	cin.getline(a,500);
    for(int i=0;i<strlen(a);i++)
    {
    	switch(a[i])
 	{
 		case 'x':
    	    b[i]='a';
    	    break;
	    case 'y':
	    	b[i]='b';
	    	break;
	    case 'z':
	    	b[i]='c';
	    	break;
	    case 'X':
	    	b[i]='A';
	    	break;
	    case 'Y':
	    	b[i]='B';
	    	break;
	    case 'Z':
	    	b[i]='C';
	    	break;
	    default:
	        b[i]=a[i]+3;
	 }
		
    }
    for(int i=0;i<strlen(a);i++)
    {
    	c[i]=b[strlen(a)-1-i];
	}
	for(int i=0;i<strlen(a);i++)
	{
		if(c[i]>=65&&c[i]<=90)
		{
			c[i]=c[i]+32;
		}
		else
		{
			c[i]=c[i]-32;
		}
	}
	for(int i=0;i<strlen(a);i++)
	{
		cout<<c[i];
	}
	return 0;
 }

Method 3 ： Minimalist

#include<string.h>
#include<iostream>
using namespace std;
int main()
{
	char a[500];
	char b[500];
	char c[500];
	cin.getline(a,500);
    for(int i=0;i<strlen(a);i++)
    {
    	if((a[i]>='x'&&a[i]<='z')||(a[i]>='X')&&a[i]<='Z')
    	{
    		b[i]=a[i]-23;//x,y,z Three elements move right 3 The situation of the first position  
		}
		else
	        b[i]=a[i]+3;
	 	
    }
    for(int i=0;i<strlen(a);i++)
    {
    	c[i]=b[strlen(a)-1-i];// The reverse ： The first and the last are interchangeable ; The second and penultimate are interchanged  
	}
	for(int i=0;i<strlen(a);i++)
	{
		if(c[i]>=65&&c[i]<=90)// Capital   Add 32 Change to lowercase  
		{
			c[i]=c[i]+32;
		}
		else// Lowercase letters  
		{
			c[i]=c[i]-32;
		}
	}
	for(int i=0;i<strlen(a);i++)
	{
		cout<<c[i];
	}
	return 0;
 }