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  1. #include <stdio.h>
  2.  
  3. unsigned reverse(
  4.     unsigned input,
  5.     unsigned const base,
  6.     unsigned * const zeros) {
  7.   unsigned output = 0;
  8.   unsigned still_zero = 0;
  9.   for (; input != 0; input/=base) {
  10.     output *= base;
  11.     output += input % base;
  12.     if (output == 0) {
  13.       ++still_zero;
  14.     }
  15.   }
  16.   if (zeros != NULL) {
  17.     *zeros = still_zero;
  18.   }
  19.   return output;
  20. }
  21.  
  22. void print_zeros(unsigned zeros) {
  23.   for (; zeros != 0; --zeros) {
  24.     printf("0");
  25.   }
  26. }
  27.  
  28. int main(void) {
  29.   unsigned value = 320;
  30.   unsigned zeros;
  31.   unsigned reversed;
  32.  
  33.   reversed = reverse (value, 10, & zeros);
  34.   printf("%u  -  ", value); print_zeros(zeros); printf("%u\n", reversed);
  35.  
  36.   reversed = reverse (value, 8, & zeros);
  37.   printf("%o  -  ", value); print_zeros(zeros); printf("%o\n", reversed);
  38.  
  39.   reversed = reverse (value, 16, & zeros);
  40.   printf("%x  -  ", value); print_zeros(zeros); printf("%x\n", reversed);
  41.  
  42.   return 0;
  43. }
Success #stdin #stdout 0s 2156KB
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stdin
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Standard input is empty
stdout
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320  -  023
500  -  005
140  -  041
https://ideone.com/eu8rme
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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