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Roman numerals/Encode: Difference between revisions
→{{header|C}}
Line 1,579:
CCXV
</pre>
===Not thread-safe===
<lang C>#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
int RomanNumerals_parseInt(const char* string)
{
int value;
return scanf("%u", &value) == 1 && value > 0 ? value : 0;
}
const char* RomanNumerals_toString(int value)
{
#define ROMAN_NUMERALS_MAX_OUTPUT_STRING_SIZE 64
static buffer[ROMAN_NUMERALS_MAX_OUTPUT_STRING_SIZE];
const static int maxValue = 5000;
const static int minValue = 1;
const static struct Digit {
char string[4]; // It's better to use 4 than 3 (aligment).
int value;
} digits[] = {
{"M", 1000}, {"CM", 900}, {"D", 500 }, {"CD", 400 },
{"C", 100 }, {"XC", 90 }, {"L", 50 }, {"XL", 40}, {"X", 10},
{"IX", 9}, {"V", 5}, {"IV", 4}, {"I", 1 }, {"?", 0}
};
*buffer = '\0'; // faster than memset(buffer, 0, sizeof(buffer));
if (minValue <= value && value <= maxValue)
{
struct Digit* digit = &digits[0];
do
{
while (value >= digit->value)
{
value -= digit->value;
// It is not necessary - total length would not be exceeded...
// if (strlen(buffer) + strlen(digit->string) < sizeof(buffer))
strcat(buffer, digit->string);
}
digit++;
} while (digit->value);
}
return buffer;
}
int main(int argc, char* argv[])
{
if (argc < 2)
{
// Blanks are needed for a consistient blackground on some systems.
// BTW, puts append an extra newline at the end.
//
puts("Write given numbers as Roman numerals.\n"
" \n"
"Usage: \n"
" roman n1 n2 n3 ... \n"
" \n"
"where n1 n2 n3 etc. are Arabic numerals\n");
int numbers[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1498, 2022 };
for (int i = 0; i < sizeof(numbers) / sizeof(int); i++)
{
printf("%4d = %s\n",
numbers[i], RomanNumerals_toString(numbers[i]));
}
}
else
{
for (int i = 1; i < argc; i++)
{
int number = RomanNumerals_parseInt(argv[i]);
if (number)
{
puts(RomanNumerals_toString(number));
}
else
{
puts("???");
}
}
}
return 0;
}</lang>
{{Output}}
<pre>Write given numbers as Roman numerals.
Usage:
roman n1 n2 n3 ...
where n1 n2 n3 etc. are Arabic numerals
1 = I
2 = II
3 = III
4 = IV
5 = V
6 = VI
7 = VII
8 = VIII
9 = IX
10 = X
1498 = MCDXCVIII
2022 = MMXXII</pre>
=={{header|C sharp|C#}}==
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