Roman Number System of representing numbers devised by the ancient Romans. The numbers are formed by combinations of the symbols I, V, X, L, C, D, and M, standing, respectively, for 1, 5, 10, 50, 100, 500, and 1,000 in the Hindu-Arabic numeral system. Natural numbers mean no negative numbers and no fractions, i.e. the whole numbers from 1 upwards: 1, 2, 3, and so on. Here is source code of the C program to convert natural numbers to Roman Numerals. It compiles and runs on any operating system. #include <stdio.h> void predigit(char num1, char num2); void postdigit(char c, int n); char romanval[1000]; int i = 0; int main() { int j; long number; printf("Enter any natural number: "); scanf("%d", &number);