Assignment 8 An island is the collection of terrain points

CSE 102 Homework Assignment 8

Your program reads one text file: – input.txt • Your program creates a text file: – output.txt • Your program solves the following problem: – You are given a water level information L. Condition: 0<L<128. – You are given a terrain information (elevation matrix M). Condition: 0≤M[i][j]<128∀i,j<512. – Calculate how many islands are formed and return a coordinate value for each island. – Definition of an island: An island is the collection of terrain points( elevation values M[i][j]), above water( greater than L value), from which you can find a path to any other without having to pass the path through water. – Definition of a path: A path is an ordered set of points where successive points have either their X coordinates the same and their Y coordinates different only by one in magnitude (so can be y − 1 or y + 1); or have their Y coordinates the same and have their X coordinates different only by one in magnitude (so can be x − 1 or x + 1). But not both of them: in other words they have to touch either in the X direction or in the Y direction, and not in the diagonal. – If a piece of terrain is partially (or fully) located (touching) at the edge(s) of the 512 × 512 grid, still it will count as an island.
input.txt • First line is a single integer. (The L value) • The rest of the file has 262144 integers. Skip all the whitespace and read all of these integers and create a 512x512 matrix. Integers are listed in row-order.
output.txt • The first line is an integer (number of islands) • Each line after the first line holds coordinate information of a point on an island. (single point for each island) • Example: Here there are 5 islands. (#... are comments, which are not printed.) 5 x_coordinate1 y_coordinate1 #coordinate of a point which is on island1 x_coordinate2 y_coordinate2 #coordinate of a point which is on island2 x_coordinate3 y_coordinate3 #coordinate of a point which is on island3 x_coordinate4 y_coordinate4 #coordinate of a point which is on island4 x_coordinate5 y_coordinate5 #coordinate of a point which is on island5
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Remarks • There will be at most 100 islands. • You can allocate only one array.(create an array for the terrain data). • You cannot declare any other array in your program. • You cannot use dynamic allocation. • Do not submit your code without testing it with several different scenarios. • Write comments in your code. • Do not print anything to stdout and stderr. • Do not submit any of the files you used for testing. • Do not submit your output file.
Turn in: • Source code of a complete C program. Name of the file should be in this format: <full_name_<id.c. • Example: gokhan_kaya_000000.c. Please do not use any Turkish special characters. • You don’t need to use an IDE for this assignment. Your code will be compiled and run in a command window. • Your code will be compiled and tested on a Linux machine(Ubuntu). GCC will be used. • Make sure you don’t get compile errors when you issue this command : gcc <full_name_<id.c. • Ascriptwillbeusedinordertocheckthecorrectnessofyourresults. So,becarefulnottoviolatetheexpected output format. • Provide comments unless you are not interested in partial credit. (If I cannot easily understand your design, you may loose points.) • You may not get full credit if your implementation contradicts with the statements in this document.