This post contains a total of 10+ Hand-Picked C Decimal to Roman Converter Examples with Source Code. All the Decimal to Roman Converters are made using C Programming language.
You can use the source codes of these programs for your own personal or educational use with credits to the original owner.
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1. By แทแ.แแงแดแแ
Made by แทแ.แแงแดแแ. C Program to convert Decimal number to Roman Numeral. ( Source )
#include <stdio.h>
int roman(int,int,char);
int main(void)
{
int num;
printf("Enter a decimal no :");
scanf("%d",&num);
if(num>=1000)
num = roman(num,1000,'m');
if(num>=500)
num = roman(num,500,'d');
if(num>=100)
num = roman(num,100,'c');
if(num>=50)
num = roman(num,50,'l');
if(num>=10)
num = roman(num,10,'x');
if(num>=5)
num = roman(num,5,'v');
if(num>=1)
roman(num,1,'i');
printf("\n");
return 0;
}
int roman(int n,int k,char c)
{
if(n==9)
{
printf("ix");
return 0;
}
if(n==4)
{
printf("iv");
return 0;
}
while(n>=k)
{
printf("%c",c);
n=n-k;
}
return n;
}2. By Himanshu Pawar
Made by Himanshu Pawar. ( Source )
//
//
//To convert entered number into roman numeral...
//
//
#include <stdio.h>
main()
{
int x;
scanf("%d",&x);
while(x)
{
if(x>=900)
{
if(x<1000){printf("CM");x-=900;}
else if(x>=1000){printf("M");x-=1000;}
}
else if(x>=400)
{
if(x<500){printf("CD");x-=400;}
else if(x>=500){printf("D");x-=500;}
}
else if(x>=90)
{
if(x<100){printf("XC");x-=90;}
else if(x>=100){printf("C");x-=100;}
}
else if(x>=40)
{
if(x<50){printf("XL");x-=40;}
else if(x>=50){printf("L");x-=50;}
}
else if(x>=9)
{
if(x<10){printf("IX");x-=9;}
else if(x>=10){printf("X");x-=10;}
}
else if(x>=4)
{
if(x<5){printf("IV");x-=4;}
else if(x>=5){printf("V");x-=5;}
}
else
{
printf("I");
x--;
}
}
}3. By Md.Danial Islam
Made by Md.Danial Islam. ( Source )
#include <stdio.h>
int main() {
int a;
printf("Enter The decimal no:(1-20)\n");
scanf("%d",&a);
if(a==1){
printf ("The Roman sign of %d is I\n",a);
}
else if(a==2){
printf ("The Roman sign of %d is II\n",a);
}
else if(a==3){
printf ("The Roman sign of %d is III\n",a);
}
else if(a==4){
printf ("The Roman sign of %d is IV\n",a);
}
else if(a==5){
printf ("The Roman sign of %d is V\n",a);
}
else if(a==6){
printf ("The Roman sign of %d is VI\n",a);
}
else if(a==7){
printf ("The Roman sign of %d is VII\n",a);
}
else if(a==8){
printf ("The Roman sign of %d is VIII\n",a);
}
else if(a==9){
printf ("The Roman sign of %d is IX\n",a);
}
else if(a==10){
printf ("The Roman sign of %d is X\n",a);
}
else if(a==11){
printf ("The Roman sign of %d is XI\n",a);
}
else if(a==12){
printf ("The Roman sign of %d is XII\n",a);
}
else if(a==13){
printf ("The Roman sign of %d is XIII\n",a);
}
else if(a==14){
printf ("The Roman sign of %d is XIV\n",a);
}
else if(a==15){
printf ("The Roman sign of %d is XV\n",a);
}
else if(a==16){
printf ("The Roman sign of %d is XVI\n",a);
}
else if(a==17){
printf ("The Roman sign of %d is XVI\n",a);
}
else if(a==18){
printf ("The Roman sign of %d is XVII\n",a);
}
else if(a==19){
printf ("The Roman sign of %d is XIX\n",a);
}
else if(a==20){
printf ("The Roman sign of %d is XX\n",a);
}
else {
printf ("%d is not between 1 to 20",a);
}
return 0;
}4. By Imad Elakhal
Made by Imad Elakhal. Enter your decimal number in ‘for(i=1; i<=150; i++)’. ( Source )
#include<stdio.h>
int main(void)
{
int i, x;
printf("Decimal Roman\n");
printf("Number Numeral\n");
printf("-------------------\n");
for(i=1; i<=150; i++)
{
x=i;
printf("%d ",x);
if(x==100) {
printf("C");
x=0;
}
if(x>=50) {
printf("L");
x-=50;
}
while(x>=10) {
printf("X");
x-=10;
}
if(x>=5) {
if(x%10==9) {
printf("IX");
x-=9;
}
else {
printf("V");
x-=5;
}
}
while(x>0)
{
if(x%10==4) {
printf("IV");
x-=4;
}
else {
printf("I");
x-=1;
}
}
printf("\n");
}
return (0);
}5. By soumen mitra
Made by soumen mitra. The input should be in the range 1-1000. ( Source )
#include <stdio.h>
int main() {
int num,i,j,k=0;
//printf("Enter a number = ");
scanf("%d",&num);
printf("roman representation of the number is ");
while(num>0)
{
if(num>=1 && num<5)
{
if(num==4)
{
printf("IV");
}
else
{
for(i=num;i>0;i--)
{
printf("I");
}
}
k=num;
}
if(num>=5 && num<10)
{
if(num==9)
{
printf("IX");
}
else
{
printf("V");
for(i=num-5;i>0;i--)
{
printf("I");
}
}
k=num;
}
if(num>=10 && num<50)
{
if(num/10==4)
{
printf("XL");
}
else
{
for(i=num/10;i>0;i--)
{
printf("X");
}
}
k=(num/10)*10;
}
if(num>=50 && num<100)
{
if(num/10==9)
{
printf("XC");
}
else
{
printf("L");
for(i=num/10-5;i>0;i--)
{
printf("X");
}
}
k=(num/10)*10;
}
if(num>=100 && num<500)
{
if(num/100==4)
{
printf("CD");
}
else
{
for(i=num/100;i>0;i--)
{
printf("C");
}
}
k=(num/100)*100;
}
if(num>=500 && num<1000)
{
if(num/100==9)
{
printf("CM");
}
else
{
printf("D");
for(i=num/100-5;i>0;i--)
{
printf("C");
}
}
k=(num/100)*100;
}
if(num==1000)
{
printf("M");
k=num;
}
num=num-k;
}
return 0;
}6. By jashpal parmar
Made by jashpal parmar. ( Source )
#include <stdio.h>
void roman(int y)
{
int k;
k = y / 1000;
if (k > 0)
{
for(int i=0;i<k;i++)
printf("m");
}
int l = y % 1000;
k = l / 500;
if (k > 0)
{
for(int i=0;i<k;i++)
printf("d");
}
k = (l % 500) / 100;
if (k > 0)
{
for(int i=0;i<k;i++)
printf("c");
}
l = (l % 500) % 100;
k = l / 50;
if (k > 0)
{
for(int i=0;i<k;i++)
printf("l");
}
l = l % 50;
k = l / 10;
if (k > 0)
{
for(int i=0;i<k;i++)
printf("x");
}
l = l % 10;
k = l / 5;
if (k > 0)
{
for(int i=0;i<k;i++)
printf("v");
}
l = l % 5;
if (l > 0)
{
for(int i=0;i<l;i++)
printf("i");
}
}
int main()
{
int year;
scanf("%d",&year);
printf("Year in Decimal :\n%d \n",year);
printf("Year in Roman :\n");
roman(year);
return 0;
}7. By Pranab Roy
Made by Pranab Roy. ( Source )
#include<stdio.h>
int main()
{
int x,y,z,n;
scanf("%d",&n);
x=n/100;
n=n%100;
y=n/10;
z=n%10;
if(x==1) printf("C");
else if(x==2) printf("CC");
else if(x==3) printf("CCC");
else if(x==4) printf("CD");
else if(x==5) printf("D");
else if(x==6) printf("DC");
else if(x==7) printf("DCC");
else if(x==8) printf("DCCC");
else if(x==9) printf("CM");
if(y==1) printf("X");
else if(y==2) printf("XX");
else if(y==3) printf("XXX");
else if(y==4) printf("XL");
else if(y==5) printf("L");
else if(y==6) printf("LX");
else if(y==7) printf("LXX");
else if(y==8) printf("LXXX");
else if(y==9) printf("XC");
if(z==1) printf("I");
else if(z==2) printf("II");
else if(z==3) printf("III");
else if(z==4) printf("IV");
else if(z==5) printf("V");
else if(z==6) printf("VI");
else if(z==7) printf("VII");
else if(z==8) printf("VIII");
else if(z==9) printf("IX");
printf("\n");
return 0;
}
8. By SAURAV KUMAR
Made by SAURAV KUMAR. Program to convert a decimal no to roman no for example: 14 – xiv, 123 – cxxiii. ( Source )
#include <stdio.h>
int roman(int,int,char);
int main() {
int num;
scanf("%d",&num);
printf ("%d in Roman : \n",num);
if (num >=1000)
num = roman (num ,1000, 'm');
if (num >=500)
num = roman (num ,500, 'd');
if (num >=100)
num =roman (num, 100, 'c');
if (num >=50)
num = roman (num ,50, 'l');
if (num >=10)
num = roman (num ,10, 'x');
if (num >=5)
num = roman (num ,5, 'v');
if (num >=1)
roman (num ,1,'i');
return 0;
}
int roman (int n,int m,char c)
{
if (n==4){
printf ("iv");
return 0;}
if(n==9){
printf ("ix");
return 0;
}
while (n>=m){
printf ("%c",c);
n=n-m;
}
return n;
}
9. By Nishith Savla
Made by Nishith Savla. Program to convert any number into its roman equivalant. ( Source )
#include <stdio.h>
void roman();
int main()
{
int num;
// User input
printf ("Enter a number: ");
scanf ("%i", &num);
printf ("\n%i ->", num);
roman(num);
return 0;
}
void roman(int num)
{
int numbers[ ] = {1000000, 900000, 500000, 400000, 100000, 90000, 50000, 40000, 10000, 90000, 50000, 40000, 10000, 9000, 5000, 4000 ,1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
char *symbols[ ] = {"(M)", "(DM)", "(D)", "(CD)", "(C)", "(LC)", "(L)", "(XL)", "(X)", "(IX)","(V)", "(IV)", "M", "DM", "D", "CD","C", "LC", "L", "XL", "X", "IX", "V", "IV", "I"};
if (num < 0)
printf ("-");
for (int i = 0; num != 0; i++)
{
while (num/numbers[i])
{
printf ("%s", symbols[i]);
num -= numbers[i];
}
}
}10. By Leo_de_River
Made by Leo_de_River. ( Source )
#include <stdio.h>
int main() {
int num;
printf("Enter your decimal number");
scanf("%i", &num);
return 0;
}11. By metehannbulut
Made by metehannbulut. ( Source )
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
void converter() //Decimal to Roman number converter func.
{
int number,i= 0;
char converted[400]={};
printf("Please enter the number which you want to convert to roman numerals:\n");
scanf("%d",&number);
printf("Converted form:");
while(number>=1000){
number=number-1000;
converted[i]= 'M';
i++;
}
if(number<1000 && number>899){
converted[i]= 'C';
i++;
converted[i]= 'M';
i++;
number=number-900;
if (number>10)
goto fiftys;
}
while(number>=500){
number=number-500;
converted[i]= 'D';
i++;
}
if(number<500 && number>399){
converted[i]= 'C';
i++;
converted[i]= 'D';
i++;
number= number-400;
goto TensDigit;
}
while(number>=100){
number=number-100;
converted[i]= 'C';
i++;
}
fiftys:
if(89<number && number<100){
converted[i]= 'X';
i++;
converted[i]= 'C';
i++;
number= number-90;
goto TensDigit;
}
while(number>=50){
number=number-50;
converted[i]= 'L';
i++;
}
if(number<50 && number>39){
converted[i]= 'X';
i++;
converted[i]= 'L';
i++;
number=number-40;
goto TensDigit;
}
TensDigit:
while(number>=10){
number=number-10;
converted[i]= 'X';
i++;
}
if(number==9){
converted[i]= 'I';
i++;
converted[i]='X';
i++;
goto End;
}
while(number>=5){
number=number-5;
converted[i]= 'V';
i++;
}
if(number==4){
converted[i]= 'I';
i++;
converted[i]='V';
i++;
goto End;
}
while(number>=1){
number=number-1;
converted[i]= 'I';
i++;
}
End:
for(i=0;i<100;i++){
printf("%c",converted[i]);
}
printf("\n\n\n");
}
int main() //Our Main func.
{
int i;
printf("How many number you want to convert?\n");
scanf("%d",&i);
printf("\n");
for(i;i>0;i--){
converter();
}
printf("Programm will be shutted down in 5 sec");
sleep(5);
return 0;
}