Program 222 : Decryption Of Caesar Code using C

Program 222:
 

#include<stdio.h>
#include<string.h>
main()
{
 //Decryption
//X-A,Y-B,Z-C,A-D,B-E,C-F... if number=1
//W-A,X-B,Y-C,Z-D,A-E,B-F... if number=2 and so on
 
 int i,number;
 char str[1000],str1[1000];
 printf("Enter a sentence\n");
 gets(str); 
 printf("Enter the number to change alphabetical order\n");
 scanf("%d",&number);
 i=0;
 printf("Decrypted Caesar code\n\n");
  while(str[i]!='\0')
  {
 if(!((str[i]>=0&&str[i]<65)||(str[i]>90&&str[i]<97)||(str[i]>122&&str[i]<=127)))
 {
  if((str[i]>='a')&&(str[i]<'z'-number-1))
  {
       printf("%c",str[i]+number+2); 
  }
  else if(str[i]>='A'&&str[i]<'Z'-number-1)
  {
       printf("%c",str[i]+number+2); 
  }
  else
  {
   printf("%c",str[i]-24+number);
  }

 } 
    
    if(((str[i]>=0&&str[i]<65)||(str[i]>90&&str[i]<97)||(str[i]>122&&str[i]<=127)))
    {
      printf("%c",str[i]);    
    }
    
   i++;
  }
  printf("\n");
 
}

Explanation:

//Coming Soon...

 Output: