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#include <stdio.h> | |
#define BYTE_TO_BINARY_PATTERN "%c%c%c%c%c%c%c%c" | |
#define BYTE_TO_BINARY(byte) \ | |
(byte & 0x80 ? '1' : '0'), \ | |
(byte & 0x40 ? '1' : '0'), \ | |
(byte & 0x20 ? '1' : '0'), \ | |
(byte & 0x10 ? '1' : '0'), \ | |
(byte & 0x08 ? '1' : '0'), \ | |
(byte & 0x04 ? '1' : '0'), \ | |
(byte & 0x02 ? '1' : '0'), \ | |
(byte & 0x01 ? '1' : '0') | |
int main() | |
{ | |
printf("Hello World\n"); | |
int dividend = 63; // N | |
int divisor = 4; // D | |
int n = 6; // number of bits in dividend | |
int N = 63; | |
int D = 4; | |
int Q = N; | |
int P = N; | |
printf(" i\t| D\t| Q\t | P\n"); | |
D = D << n; | |
//printf(" x\t| %d\t| %d\t| %d\n", D, Q, P); | |
printf(" x"); | |
printf("\t| %d ", D); printf(BYTE_TO_BINARY_PATTERN, BYTE_TO_BINARY(D&0xff)); | |
printf("\t| %d ", Q); printf(BYTE_TO_BINARY_PATTERN, BYTE_TO_BINARY(Q&0xff)); | |
printf("\t| %d\t ", P); printf(BYTE_TO_BINARY_PATTERN, BYTE_TO_BINARY(P&0xff)); | |
printf("\n"); | |
for(int i=(n-1); i >= 0; i--){ | |
P = 2*P - D; | |
//printf(" %d\t| %d\t| %d\t| %d\n", i, D, Q, P); | |
printf(" %d", i); | |
printf("\t| %d ", D); printf(BYTE_TO_BINARY_PATTERN, BYTE_TO_BINARY(D&0xff)); | |
printf("\t| %d ", Q); printf(BYTE_TO_BINARY_PATTERN, BYTE_TO_BINARY(Q&0xff)); | |
printf("\t| %d\t ", P); printf(BYTE_TO_BINARY_PATTERN, BYTE_TO_BINARY(P&0xff)); | |
printf("\n"); | |
if(P>=0){ | |
Q |= (1 << i); | |
} else { | |
Q &= ~(1 << i); | |
P = P + D; | |
} | |
//printf(" %d\t| %d\t| %d\t| %d\n", i, D, Q, P); | |
printf(" %d", i); | |
printf("\t| %d ", D); printf(BYTE_TO_BINARY_PATTERN, BYTE_TO_BINARY(D&0xff)); | |
printf("\t| %d ", Q); printf(BYTE_TO_BINARY_PATTERN, BYTE_TO_BINARY(Q&0xff)); | |
printf("\t| %d\t ", P); printf(BYTE_TO_BINARY_PATTERN, BYTE_TO_BINARY(P&0xff)); | |
printf("\n"); | |
} | |
D = D >> n; | |
int R = N - Q*D; | |
printf("%d / %d = %d, R:%d\n", N, D, Q, R); | |
return 0; | |
} |
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