C Program to Encode a String and Display Encoded String

Problem Statement :

Read a five-letter word into the computer, then encode the word on a letter-by-letter basis by subtracting 30 from the numerical value that is used to represent each letter. Thus if the ASCII character set is being used, the letter a (which is represented by the value 97) would become a C (represented by the value 67), etc. Write out the encoded version of the word. Test the program with the following words: white, roses, Japan, zebra.

Program : To Encode Entered String and Display Encoded String

#include<stdio.h>
#include<conio.h>

char* encode(char* str) {
   int i = 0;

   while (str[i] != '\0') {
      str[i] = str[i] - 30;  // Subtract 30 From Charcter
      i++;
   }
   return (str);
}

void main() {

   char *str;

   printf("\nEnter the String to be Encode : ");
   gets(str);

   str = encode(str);
   printf("\nEncoded String : %s", str);

   getch();
}

#include<stdio.h>

#include<conio.h>

char* encode(char* str) {

int i = 0;

while (str[i] != '\0') {

str[i] = str[i] - 30; // Subtract 30 From Charcter

i++;

}

return (str);

}

void main() {

char *str;

printf("\nEnter the String to be Encode : ");

gets(str);

str = encode(str);

printf("\nEncoded String : %s", str);

getch();

}

Output :

Enter the String to be Encode : white
Encoded String : YJKVG
Enter the String to be Encode : roses
Encoded String : TQUGU
Enter the String to be Encode : Japan
Encoded String : ,CRCP
Enter the String to be Encode : zebra
Encoded String : GDTC

Enter the String to be Encode : white

Encoded String : YJKVG

Enter the String to be Encode : roses

Encoded String : TQUGU

Enter the String to be Encode : Japan

Encoded String : ,CRCP

Enter the String to be Encode : zebra

Encoded String : GDTC

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