82. C Program to Convert an Integer into Roman Letter.
How does this program work?
- This Program is used to convert a given number into equivalent roman letter.
Here is the code
#include <stdio.h>
void predigit(char num1, char num2);
void postdigit(char c, int n);
char romanval[1000];
int i = 0;
int main(void)
{
//program to convert a number into Roman value
int j;
long number;
printf("Enter a number: \n");
scanf("%d", &number);
//check number is positive or not
if (number <= 0)
{
printf("Invalid number\n");
return 0;
}
while (number != 0)
{
if ( number >= 1000)
{
postdigit('M', number / 1000); //To represent number above 1000
number =number - (number / 1000) * 1000;
}
else if (number >= 500)
{
if (number < (500 + 4 * 100))
{
postdigit('D', number / 500); //To represent number under 500
number = number - (number / 500) * 500;
}
else
{
predigit('C','M');
number = number - (1000-100);
}
}
else if (number>=100)
{
if (number < (100 + 3 * 100))
{
postdigit('C', number / 100);
number = number - (number / 100) * 100;
}
else
{
predigit('L', 'D');
number = number - (500 - 100);
}
}
else if (number >= 50 )
{
if(number < (50 + 4 * 10))
{
postdigit('L', number / 50);
number = number - (number / 50) * 50;
}
else
{
predigit('X','C');
number = number - (100-10);
}
}
else if(number >= 10)
{
if( number < (10 + 3 * 10))
{
postdigit('X', number / 10);
number = number - (number / 10) * 10;
}
else
{
predigit('X','L');
number = number - (50 - 10);
}
}
else if(number >= 5)
{
if(number < (5 + 4 * 1))
{
postdigit('V', number / 5);
number = number - (number / 5) * 5;
}
else
{
predigit('I', 'X');
number = number - (10 - 1);
}
}
else if (number >= 1)
{
if(number < 4)
{
postdigit('I', number / 1);
number = number - (number / 1) * 1;
}
else
{
predigit('I', 'V');
number = number - (5 - 1);
}
}
}
printf("Roman number is: ");
for(j = 0; j < i; j++)
printf("%c", romanval[j]);
return 0;
}
void predigit(char num1, char num2)
{
romanval[i++] = num1;
romanval[i++] = num2;
}
void postdigit(char c, int n)
{
int j;
for (j = 0; j < n; j++)
romanval[i++] = c;
}
