CSE-40049 Homework 4


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In this assignment you will implement an algorithm that uses stacks to add numbers of any size.
The largest magnitude of integers is limited. We are not able to add
18,274,364,583,929,273,748,525 and 8,129,498,165,026,350,236 because integer variables cannot
hold such large values, let alone their sum.

The problem can be solved if we treat these numbers as strings of numerals, store the numbers
corresponding to these numerals on two stacks, and then perform addition by popping from the

The pseudocode for this algorithm is as follows:
addLargeNumbers(number1, number2)
read the numerals of the first number and store them on one stack
read the numerals of the second number and store them on another stack
var result := 0

while at least one stack is not empty
pop a numeral from each nonempty stack and add them to result
push the unit part of addition onto a new stack called the result stack
store the carry part of the addition in result
push result onto the result stack if it is not zero
pop numbers from the result stack and display them

The following diagram shows an example of adding numbers 592 and 3,784:

a) (6 point) Implement the addLargeNumbers function with the following prototype:
void addLargeNumbers(const char *pNum1, const char *pNum2);

This function should output the result of adding the two numbers passed in as strings. Here
is an example call to this function with the expected output:
/* Sample call to addLargeNumbers */
addLargeNumbers(“592”, “3784”);
/* Expected output */

b) (3 points) Implement a test program that demonstrates adding at least three pairs of large
numbers (numbers larger than can be represented by a long).

c) (1 point) Make sure your source code is well-commented, consistently formatted, uses no
magic numbers/values, follows programming best-practices, and is ANSI-compliant.

Turn in all source code, program output, diagrams, and answers to questions in a single
Word or PDF document.