#include <stdio.h>
#define ROWS 4
#define COLS 4
int nums[ROWS][COLS]={{1000,1000,1000,1000},
{900,500,400,100},
{90,50,40,10},
{9,5,4,1}};
char *roms[ROWS][COLS]={{"m","m","m","m"},
{"cm","d","cd","c"},
{"xc","l","xl","x"},
{"ix","v","iv","i"}};
main(int argc,char *argv[ ])
{
int low,high;
char roman[25];
if(argc<2)
{ printf("Usage:roman decimal_number\n");/*运行程序需带整数参数*/
exit(0);
}
high=low=atoi(argv[1]);/*将第一个参数转换成整数*/
checknum(low);
if(argc>2)
{/*带两个参数*/
high=atoi(argv[2]);
checknum(high);
if(low>high)
{
low=high;
high=atoi(argv[1]);
}
}
else
low=1;
for(;low<=high;low++)
{
to_roman(low,roman);
printf("%d\t%s\n",low,roman);
}
}
checknum(int val)/*检查参数合理性*/
{
if(val<1||val>9999)
{
printf("The number must be in range 1..9999.\n");
exit(0);
}
}
to_roman(int decimal,char roman[ ])/*将整数转换成罗马数字表示*/
{
int power,index;
roman[0]='\0';
for(power=0;power<ROWS;power++)
for(index=0;index<COLS;index++)
while(decimal>=nums[power][index])
{
strcat(roman,roms[power][index]);
decimal-=nums[power][index];
}
}
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