## V22.0002 - ASSIGNMENT 5

You will write a program that writes a line on a 15x15 grid on the screen. The line is indicated by capital X's, the empty part of the grid is indicated by underscores ("_"). The user enters the beginning and ending coordinates of the line in terms of column and row, with the first entry being 1 and the last 15.

Specs:

1. The program will read a pair of integers representing the starting coordinates.

2. The program will read a pair of integers representing the ending coordinates.

3. The program has to verify that the coordinates are legal, i.e.: within the range 1-15.

4. The program has to be able to handle points given in any order (i.e., even if the "ending" point is in a row that proceeds the "starting" point).

5. The line must resemble as much as possible a straight line. So if the line is slanted, the program will have to compute the correct column for each row so that amount of the shift is proportional to the position in the line (i.e.: say that you determine that the line should shift 1 column every 2 rows, the first and second row will have the X printed in the same column, the third and fourth row will have it one over, etc.).
Ex:
```   Enter starting column and row: 2 2
Enter ending column and row  : 9 9

_______________
_X_____________
__X____________
___X___________
____X__________
_____X_________
______X________
_______X_______
________X______
_______________
_______________
_______________
_______________
_______________
_______________

Enter starting column and row: 9 2
Enter ending column and row  : 2 9

_______________
________X______
_______X_______
______X________
_____X_________
____X__________
___X___________
__X____________
_X_____________
_______________
_______________
_______________
_______________
_______________
_______________

Enter starting column and row: 2 2
Enter ending column and row  : 8 13

_______________
_X_____________
_X_____________
__X____________
__X____________
___X___________
___X___________
____X__________
____X__________
_____X_________
_____X_________
______X________
_______X_______
_______________
_______________
```
Notes and Hints:
• All loops should be implemented using for.
• Since you have to print the rows starting from row 1, you will have to decide which is the "real" starting point and which is the "real" ending point.
• When computing the column at which to print the X, you must take into account the possibility that the line is slanted left (i.e.: the column of the starting point is greater than the column of the ending point).