Hello, I have a program in C that deciphers \'caeser text\' into plain english.

Question

Hello, I have a program in C that deciphers 'caeser text' into plain english. In caesar text, the letter given is shifted three letters down. IN this way A becomes D, B becomes E, C becomes F, and so on. When it reaches the end of the alphabet , it wraps back to the beggining (i.e. z becomes c).

Example: Hello = KHOOR

I have completed the code that does the job, but they asked me to use a C string function such as strlen(), strcat(), strcmp() ... Can someone help me incorporate a C function to this existing program?

Much appreciated,

Thank you!

#include
void main()
{
   int i=0;
   char str[200];
  
   printf("Enter ccaeser text: ");
   scanf("%s",str);
  
   while(str[i]!=''){
      
       if(str[i]>=97 && str[i]<=122)
       {
           str[i]= str[i]-32;
       }
       if(str[i]>=88)
           str[i]=str[i]-26;
      
       str[i]=str[i]+3;
       i++;
   }
  
   printf("Plain English String is: %s ",str);      
}

Explanation / Answer

#include <stdio.h>
#include <string.h>

void main()
{
   int i = 0;
    char str[200];
  
   printf("Enter caeser text: ");
    scanf("%s", str);
  
   int len = strlen(str);
    for(i = 0; i < len; i++)
    {
        if(str[i] >= 97 && str[i] <= 122)
        {
   str[i] = str[i] - 32;
   }
   if(str[i] >= 88)
   str[i] = str[i] - 26;
   str[i] = str[i] + 3;
    }
  
    printf("Plain English String is: %s ",str);
}

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