#include <stdio.h>#include <string.h>unsigned char Dec[48];unsigned char A[48][56]; void Init(){ int i, j, carry = 0; A[0][0] = 5; for(i = 1; i < 48; i++) { for(j = 0; j < (i+1); j++) { A[i][j] = (A[i-1][j] + carry) / 2; carry = (A[i-1][j] & 1) * 10; } }}int Convert(char* pOctNum){ int testNum[] = { 4, 2, 1 }; int index = 0, length = 0; int i, j, carry, digit; char* p = pOctNum + 2; memset(Dec, 0, sizeof(Dec)); while(*p) { digit = *p - '0'; for(j = 0; j < 3; j++) { if(digit & testNum[j]) { length = index*3 + j + 1; for(i = 0; i < length; i++) Dec[i] += A[index*3 + j][i]; } } ++p; ++index; } for(i = length; i > 0; --i) { if(Dec[i] > 9) { carry = Dec[i]/10; Dec[i-1] += carry; Dec[i] = Dec[i] - carry * 10; } } return length;}int main(int argc, char* argv[]){ int length, i; char line[256]; Init(); while(gets(line) != NULL && line[0] != 0) { length = Convert(line); printf("%s [8] = 0.", line); for(i = 0; i < length; i++) { printf("%d", Dec[i]); } printf(" [10]n"); } return 0;}
