【本文链接】
http://www.cnblogs.com/hellogiser/p/16-to-3-or-k.html
【题目】
写代码把16进制表示的串转换为3进制表示的串。例如x=”5”，则返回：”12”；又例如：x=”F”，则返回”120”
【代码】
C++ Code
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/*
version: 1.0 author: hellogiser blog: http://www.cnblogs.com/hellogiser date: 2014/9/22 */ #include "stdafx.h" #include <iostream> #include <stack> using namespace std; int getvalue(char c) { if (c >= '0' && c <= '9') return c - '0'; else if (c >= 'a' && c <= 'f') return c - 'a' + 10; else if (c >= 'A' && c <= 'F') return c - 'A' + 10; return 0; } // "f" ===>15 int GetString16Value(char *str) { if(str == NULL || *str == ' ') return -1; int result = 0; while(*str != ' ') { result = result * 16 + getvalue(*str); str ++; } return result; } void output(stack<int> &s) { while (!s.empty()) { cout << s.top(); s.pop(); } cout << endl; } // f --->15 --->120 /* 15 n%3 n/3 0 5 2 1 1 0 */ void String16to3(char *str) { if(str == NULL || *str == ' ') return; int value16 = GetString16Value(str); stack<int> result; int t; // do while(value16) // if value16=0,then result push 0 do { t = value16 % 3; result.push(t); // save t value16 /= 3; } while(value16); // reverse output, so here we use stack to implement this function // 021 ===>120 output(result); } // 16 to K void String16toK(char *str, unsigned int K) { if(str == NULL || *str == ' ') return; if (K == 0 || K > 10) return; int value16 = GetString16Value(str); stack<int> result; int t; do { t = value16 % K; result.push(t); // save t value16 /= K; } while(value16); // reverse output, so here we use stack to implement this function output(result); } void test_base(char *str) { String16to3(str); String16toK(str, 3); } void test_case0() { char *str = NULL; test_base(str); } void test_case1() { char str[] = ""; test_base(str); } void test_case2() { char str[] = "0"; test_base(str); } void test_case3() { char str[] = "5"; test_base(str); } void test_case4() { char str[] = "F"; test_base(str); } void test_main() { test_case0(); // test_case1(); // test_case2(); // 0 test_case3(); // 12 test_case4(); // 120 } int main() { test_main(); return 0; } |
【参考】