计蒜客——整数转换成罗马数字

 1 #include<stdio.h>
 2 #include<malloc.h>
 3 #define N 30
 4 int thousand,hunderd,ten,one,i = 0,j = 0;
 5 char* str;
 6 char Roma[8] = {'I','V','X','L','C','D','M'};
 7 char* calculate(int X);
 8 void SpecialCalculate(int num,int flag);
 9 int main(void)
10 {
11     int num;
12     str = (char*)malloc(sizeof(char)*N);
13     scanf("%d",&num);
14     printf("%s",calculate(num));
15     return 0;
16 }
17 char* calculate(int X)
18 {
19 
20     thousand = X/1000;
21     hunderd = X%1000/100;
22     ten = X%100/10;
23     one = X%10;
24     //处理千位数
25     if(thousand != 0)
26         for(j = 0;j < thousand;j++)
27             str[i++] = Roma[6];
28     if(hunderd != 0)
29     {
30         //3以下的直接循环输出  4则特别输出，5到8循环输出，9特殊
31         SpecialCalculate(hunderd,0);
32     }
33     if(ten != 0)
34     {
35         SpecialCalculate(ten,1);
36     }
37     if(one != 0)
38         SpecialCalculate(one,2);
39     str[i] = '';
40     return str;
41 }
42 void SpecialCalculate(int num,int flag)
43 {
44     int gap = flag*2;
45     if(num <= 3)
46             for(j = 0;j < num;j++)
47                 str[i++] = Roma[4-gap];
48         else if(4 == num)
49         {
50             str[i++] = Roma[4-gap];
51             str[i++] = Roma[5-gap];
52         }
53         else if(9 == num)
54         {         
55             str[i++] = Roma[4-gap];
56             str[i++] = Roma[6-gap];
57         }
58         else
59         {
60             str[i++] = Roma[5-gap];
61             for(j = 0;j<num - 5;j++)
62                 str[i++] = Roma[4-gap];
63         }
64 }