C Program to convert a Roman numeral to its decimal equivalent.

Posted on October 12, 2011June 29, 2026 by Sandeepa Nadahalli

Roman numerals to decimal conversion is a classic algorithm problem that tests your ability to identify the subtractive notation rule. Roman numerals use seven symbols (I, V, X, L, C, D, M) and a key rule: when a smaller value symbol appears before a larger one, it is subtracted instead of added. So IV = …

2’s Complement of a Binary Number in C

Posted on October 12, 2011June 29, 2026 by Sandeepa Nadahalli

The 2’s complement of a binary number in C is the way modern computers represent negative integers. In an 8-bit system, +5 is stored as 00000101 and −5 is stored as 11111011 (the 2’s complement of 00000101). Using 2’s complement, subtraction becomes ordinary addition and there is only one representation of zero — which is …