assignment2.md

Assignment2: Addition and Subtraction for Large Integers

Description

Please write a program that can take three integers as input and perform the addition or subtraction of two large integers. The first integer is the operation code, which is 0 for addition and 1 for subtraction. The second and third integers are the operands. The second and third inputs are large integers, each of which has 10 digits (values between 1,111,111,111 and 9,999,999,999).

Requirements

• Use scanf("%1d") to read each digit of the large integers and store these digits in arrays.
• Write two functions, add and sub, to manually perform addition and subtraction given arrays. For sub, the function should perform the subtraction of the second integer from the first integer.
• In your functions, you should handle carries and borrows for the addition and subtraction of large integers.
• Upload your code and report as a zip file (student_id_name_hw2.zip) containing the following files:
  • code: student_id_name_hw2.c
  • report: student_id_name_hw2.pdf (.md, .docx are also acceptable)
  • Example filenames: 1234567890_林英嘉_hw2.zip
    • 1234567890_林英嘉_hw2.c
    • 1234567890_林英嘉_hw2.pdf

Input Format

1. The first input is an integer (0 for addition, 1 for subtraction).
2. The second and third inputs are large integers with 10 digits.

Example input code snippet

int num1[10], num2[10];
for (int i = 0; i < 10; i++) {
    scanf("%1d", &num1[i]);
}

Expected Output

Addition

• Input

0 1234567891 1234567890

• Output

2469135781

Subtraction

• Input

1 9876543210 1234567890

• Output

8641975320

Notes

• The output will always be a positive integer with 10 digits.
• Using strings to store large integers is not necessary for this assignment.
• For the test cases of sub, the second integer is always larger than the third integer.

Scoring (Total 100)

• Correctness of Addition: 35%
• Correctness of Subtraction: 35%
• Report: 30%

Punishment

• Not using arrays to store digits: -50%
• Not following the filename requirement: -20%