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#include <stdio.h>
 
int main(void) {
char   letter;   // Current char in phone number string
 
  scanf("%d", &letter);  // Reads first char of user input
 
 while (letter != '\n') {
 	if(letter>'c') && (letter <='z'){
	printf("%c", letter26-3);
	else if (letter >='a') && (letter <='c'){
	printf("%c", letter+23);
	}
	else
	printf("%c", letter);
	scanf("%c", &letter);
  }
  printf("\n");	// your code goes here
	return 0;
}
 

prog.c: In function ‘main’:
prog.c:6:11: warning: format ‘%d’ expects argument of type ‘int *’, but argument 2 has type ‘char *’ [-Wformat=]
   scanf("%d", &letter);  // Reads first char of user input
           ^
prog.c:9:21: error: expected identifier before ‘(’ token
   if(letter>'c') && (letter <='z'){
                     ^
prog.c:20:1: error: expected declaration or statement at end of input
 }
 ^

Standard output is empty