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  1. #include <stdio.h>
  2.  
  3. int main(int argc, char * argv[]) {
  4. 	int input = atoi("31344842");
  5. 	int n = input;
  6. 	int digit_count = 0;
  7. 	while(n!=0)                     //count amount of digits in input
  8. 	{
  9. 	    digit_count++;
  10. 	    n /= 10;
  11. 	}
  12. 	int digit_array[digit_count];   //create array for digits
  13.  
  14. 	int i = digit_count;
  15. 	while(i!=0)                     //assign digits to array elements
  16. 	{
  17. 	    digit_array[i-1] = input % 10;
  18. 	    input /= 10;
  19. 	    i--;
  20. 	}
  21.  
  22. 	//count number of times a digit has appeared
  23. 	int digit_amount[10] = {0,0,0,0,0,0,0,0,0,0};
  24. 	int digit = 0;
  25. 	while(digit<10)
  26. 	{
  27. 	    int j = 0;
  28. 	    while(j <= digit_count)
  29. 	    {
  30. 	        if(digit_array[j] == digit)
  31. 	        {
  32. 	            digit_amount[digit]++;
  33. 	        }
  34. 	        j++;
  35. 	    }
  36. 	    digit++;
  37. 	}
  38. 	//final output
  39. 	printf("Repeated digits:\n");
  40. 	int k = 0;
  41. 	while(k<10)
  42. 	{
  43. 	    if(digit_amount[k] >= 2)
  44. 	    {
  45. 	        printf("\"%i\" occurs %i times.\n",k,digit_amount[k]);
  46. 	    }
  47. 	    k++;
  48. 	}
  49. 	return 0;
  50. }
  51.  
Success #stdin #stdout 0s 2156KB
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stdin
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Standard input is empty
stdout
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Repeated digits:
"3" occurs 2 times.
"4" occurs 3 times.
https://ideone.com/ajbJnd
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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