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#include <stdio.h>

#include <string.h>

//Returns the number of letters (alpha characters) in usrStr

int gNoOfChars = 0;

int getNumAlpha(const char usrStr[]) {

   /* Type your code here. */

   return strlen(usrStr);

}

//Returns character stored in replaceChar if thisChar matches thatChar,

//otherwise returns character stored in thisChar

char encodeChar(const char thisChar, const char thatChar, const char replaceChar) {

   /* Type your code here. */

   if (thatChar == thatChar)

       return replaceChar;

   else

       return thisChar;

}

//encodes usrStr following the replacement guidelines in the lab assignment description

void encodeString(char usrStr[]) {

   /* Type your code here. */

   int i = 0;

   char ch;

   int size = strlen(usrStr);

   for (i = 0; i < size; i++)

   {

       ch = usrStr[i];

       if ((ch >= 65 && ch <= 90) || ch >= 97 && ch <= 122)

           gNoOfChars++;

       switch (usrStr[i])

       {

       case '0':

       case '1':

       case '2':

       case '3':

       case '4':

       case '5':

       case '6':

       case '7':

       case '8':

       case '9':

           usrStr[i] = encodeChar(usrStr[i], usrStr[i], '#');

           break;

       case 'O':

           usrStr[i] = encodeChar(usrStr[i], usrStr[i], '0');

           break;

       case 'I':

           usrStr[i] = encodeChar(usrStr[i], usrStr[i], '1');

           break;

       case 'Z':

           usrStr[i] = encodeChar(usrStr[i], usrStr[i], '2');

           break;

       case 'E':

           usrStr[i] = encodeChar(usrStr[i], usrStr[i], '3');

           break;

       case 'H':

           usrStr[i] = encodeChar(usrStr[i], usrStr[i], '4');

           break;

       case 's':

           usrStr[i] = encodeChar(usrStr[i], usrStr[i], '5');

           break;

       case 'b':

           usrStr[i] = encodeChar(usrStr[i], usrStr[i], '6');

           break;

       case 'L':

           usrStr[i] = encodeChar(usrStr[i], usrStr[i], '7');

           break;

           break;

       case 'B':

           usrStr[i] = encodeChar(usrStr[i], usrStr[i], '8');

           break;

       case 'g':

           usrStr[i] = encodeChar(usrStr[i], usrStr[i], '9');

           break;

       default:

           break;

       }

   }

}



int main(void) {

   /* Type your code here. */

   int i = 0;

   char usrInput[100] = { '\0' };

   int flag = 0;

   int usrInputLen = 0;

   printf("Enter a Message: ");



   i = 0;

   while (i<100 - 1)//read only 100 characters

   {

       scanf("%c", &usrInput[i]);

       if (usrInput[i] == '\n')

       {

           flag = 1;

           break;

       }

       i++;

   }

   if (flag == 0)//out of the loop but new line not found.

   {

       printf("\r\nInput message should be 100 characters long only.");

       return 0;

   }

   printf("\r\nYou Entered: %s", usrInput);



   usrInputLen = getNumAlpha(usrInput);

   printf("\r\nNumber of Characters: %d", usrInputLen);

   encodeString(usrInput);

   printf("\r\n Number of Letters: %d", gNoOfChars);

   printf("\r\nEncoded Message: ");

   for (i = 0; i < usrInputLen; i++)

       printf("%c", usrInput[i]);

   return 0;

}