Problem 3: String encoder (40 Points) Write a C program to input a string from t

Question

Problem 3: String encoder (40 Points) Write a C program to input a string from the user and encodes it into a different string of same length according to the following rules. 1. Convert all the lower-case letter in it to the corresponding upper-case letter. 2. Convert all the upper-case letter in it to the corresponding lower-case letter 3. Convert each even digit in it to O' and each odd digit in it to 1 4. Keep any other character unchanged Your program must print the encoded string. You are not allowed to use any string library functions. Name your program file pa3_q3.c HINT: Read about ascii characters and its representations. Read about character arrays. Use scanf) to input the string using a character array of size 30. Example1: Enter the string Ab@#9 8760ZgYRInNc-14Sz Encoded string aB@# 10 1002GyrMn?FF4109 Encoded string h0wDY1 101 @#*IZ>Mf01 01

Explanation / Answer

#include <stdio.h>

int main() {
   char ch, str[30];
   int i = 0;
   printf("Enter the string ");
   scanf("%s", str);
   printf("Encoded string ");
   while((ch = str[i++])) {
       if(ch >= 'a' && ch <= 'z') {
           ch -= 32;
       } else if(ch >= 'A' && ch <= 'Z') {
           ch += 32;
       } else if(ch >= '0' && ch <= '9') {
           if((ch - '0') % 2 == 0) {
               ch = '0';
           } else if((ch - '0') % 2 == 1) {
               ch = '1';
           }
       }
       printf("%c", ch);
   }
   printf(" ");
   return 0;
}

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