C Exercises: Convert a given integer to roman number
C Programming Challenges: Exercise-6 with Solution
Write a C program to convert a given integer to a Roman number.
Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 1000
C Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void num_to_char(char **num, int bit, int n)
{
int i;
char low, mid, high;
char *p = *num;
switch (n) {
case 2:
low = 'C';
mid = 'D';
high = 'M';
break;
case 1:
low = 'X';
mid = 'L';
high = 'C';
break;
case 0:
low = 'I';
mid = 'V';
high = 'X';
break;
}
if (bit > 0) {
switch (bit) {
case 1:
case 2:
case 3:
for (i = 0; i < bit; i++) {
*p++ = low;
}
break;
case 4:
*p++ = low;
*p++ = mid;
break;
case 5:
*p++ = mid;
break;
case 6:
case 7:
case 8:
*p++ = mid;
for (i = 5; i < bit; i++) {
*p++ = low;
}
break;
case 9:
*p++ = low;
*p++ = high;
break;
}
}
*num = p;
}
static char roman_numeral[64];
static char *int_to_roman(int num)
{
char *p = &roman_numeral[0];
int thousand_bit_num = num / 1000;
int hundred_bit_num = (num % 1000) / 100;
int ten_bit_num = (num % 100) / 10;
int one_bit_num = num % 10;
int i;
memset(roman_numeral, 0, sizeof(roman_numeral));
if (thousand_bit_num > 0) {
if (thousand_bit_num < 4) {
for (i = 0; i < thousand_bit_num; i++) {
*p++ = 'M';
}
}
}
num_to_char(&p, hundred_bit_num, 2);
num_to_char(&p, ten_bit_num, 1);
num_to_char(&p, one_bit_num, 0);
return roman_numeral;
}
int main(void)
{
int n = 12;
printf("Original integer: %d", n);
printf("\nRoman number of the said integer: %s", int_to_roman(n));
return 0;
}
Sample Output:
Original integer: 12 Roman number of the said integer: XII
Pictorial Presentation:
Flowchart:
C Programming Code Editor:
Contribute your code and comments through Disqus.
Previous C Programming Exercise: Reverse digits of a given a 32-bit signed integer.
Next C Programming Exercise: Convert a given roman number to an integer.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
It will be nice if you may share this link in any developer community or anywhere else, from where other developers may find this content. Thanks.
https://w3resource.com/c-programming-exercises/practice/c-programming-practice-exercises-6.php
- Weekly Trends and Language Statistics
- Weekly Trends and Language Statistics