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  1. #include <stdio.h>
  2.  
  3. #define MAX_SIZE 20
  4.  
  5. void encode(char* number)
  6. {
  7. 	char letters [] = "XCOMPUTERS"; 
  8. 	char numbers [] = "0123456789";
  9. 	int index;
  10.  
  11. 	while (*number)
  12. 	{
  13. 		index = 0;
  14.  
  15. 		while (numbers[index] && *number != numbers[index])
  16. 			++index;
  17.  
  18. 		if (index == 10)
  19. 			putchar(*number);
  20. 		else 
  21. 			putchar(letters[index]);
  22.  
  23. 		++number;
  24. 	}	
  25. }
  26.  
  27. int main(void)
  28. {
  29. 	char in_string [MAX_SIZE];
  30.  
  31. 	puts("Enter a number: ");
  32.  
  33. 	if (fgets (in_string, MAX_SIZE, stdin) != NULL)
  34. 		encode(in_string);
  35.  
  36.  
  37. 	return 0;
  38. }
  39.  
Success #stdin #stdout 0s 2252KB
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Enter a number: 
OEU.EU
https://ideone.com/eCETiq
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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