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  1. #include <inttypes.h>
  2. #include <stdio.h>
  3.  
  4. typedef union
  5. {
  6.   struct
  7.   {
  8.     #define BITG(n) uint8_t bit##n : 1
  9.     BITG(0);
  10.     BITG(1);
  11.     BITG(2);
  12.     BITG(3);
  13.     BITG(4);
  14.     BITG(5);
  15.     BITG(6);
  16.     BITG(7);
  17.     #undef BITG
  18.   } bits;
  19.   uint8_t value;
  20. }getbit;
  21.  
  22. uint8_t bit_sum(uint8_t, uint8_t);
  23.  
  24.  
  25. uint8_t bit_sum(uint8_t a, uint8_t b)
  26. {
  27.   getbit op1, op2, opr;
  28.   uint8_t carry;
  29.   op1.value=a; op2.value=b;
  30.   #define OP1(n) op1.bits.bit##n
  31.   #define OP2(n) op2.bits.bit##n
  32.   #define OPR(n) opr.bits.bit##n
  33.   #define XOR(a,b) ((a)^(b))
  34.   #define AND(a,b) ((a)&(b))
  35.   OPR(0) = XOR(OP1(0), OP2(0));
  36.   carry = AND(OP1(0), OP2(0));
  37.   #define SETBIT(n)                \
  38.   OPR(n) = XOR                     \
  39.            (                       \
  40.              carry,                \
  41.              XOR(OP1(n), OP2(n))   \
  42.            );
  43.  
  44.   #define CARRYBIT(n)              \
  45.   carry = XOR                      \
  46.           (                        \
  47.             AND(OP1(n), OP2(n)),   \
  48.             AND                    \
  49.             (                      \
  50.               XOR(OP1(n), OP2(n)), \
  51.               carry                \
  52.             )                      \
  53.           );
  54.   SETBIT(1);
  55.   CARRYBIT(1);
  56.   SETBIT(2);
  57.   CARRYBIT(2);
  58.   SETBIT(3);
  59.   CARRYBIT(3);
  60.   SETBIT(4);
  61.   CARRYBIT(4);
  62.   SETBIT(5);
  63.   CARRYBIT(5);
  64.   SETBIT(6);
  65.   CARRYBIT(6);
  66.   SETBIT(7);
  67.   return opr.value;
  68.   #undef SETBIT
  69.   #undef CARRYBIT
  70.   #undef OP1
  71.   #undef OP2
  72.   #undef OPR
  73.   #undef XOR
  74.   #undef AND
  75. }
  76.  
  77. int main (int argc, char *argv[], char *envp[])
  78. {
  79.   uint8_t a, b, c;
  80.   scanf ("%"SCNu8"%"SCNu8, &a, &b);
  81.   c = bit_sum(a,b);
  82.   printf("%"PRIu8"\n", c);
  83.   return 0;
  84. }
Success #stdin #stdout 0s 2056KB
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https://ideone.com/zq4Qkf
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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