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  1. #include <stdio.h>
  2.  
  3. void print(unsigned x)
  4. {
  5. 	int i;
  6. 	for(i = 1; i <= 32; i++, x <<= 1)
  7. 	{
  8. 		putchar(x & 0x80000000 ? '1' : '0');
  9. 		if ((i & 3) == 0) putchar(' ');
  10. 	}
  11. }
  12.  
  13. int main(void) {
  14. 	const char* string = "ABcd1234";
  15.     unsigned out=0;
  16.     char x;
  17.     while((x = *string++))
  18.     {
  19.     	unsigned value;
  20.         if (x < '0') goto invalid;
  21.         if (x < '9' + 1) { value = x - '0'; goto valid; }
  22.         if (x < 'A') goto invalid;
  23.         if (x < 'F' + 1) { value = x - 'A' + 10; goto valid; }
  24.         if (x < 'a') goto invalid;
  25.         if (x < 'f' + 1) { value = x - 'a' + 10; goto valid; }
  26.         goto invalid;
  27.     valid:
  28.         out = (out << 4) | value;
  29.     }
  30.     print(out);
  31.     return 0;
  32.     invalid: return 1;
  33. }
  34.  
Success #stdin #stdout 0s 2160KB
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stdin
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Standard input is empty
stdout
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1010 1011 1100 1101 0001 0010 0011 0100
https://ideone.com/qAUuZv
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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