ECE 1620 - Assignment #1 Part 2 - Due: 21 Jan 2022

• [20] Chapter 1 Multiple Choice Problems

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• [30] a1/p2.c - Modify chapter1_1.c (again)

  Start with a copy of program chapter1_1.c shown on pages 18 and 25-26 (use the Copy button at bottom of VECR) which computes the distance between two points.

  Assume now that x1,y1 represent the coordinates of the center of a circle, and x2,y2 represent a point on the circumference of the circle.

  Modify the program so instead of computing the distance, it computes and displays the area of the circle.

  1. Remove all of the original comments (use the rmcmts link at the top of VECR), then add your own comments using //... (not /*...*/). The first comment lines of the program must contain your name and a brief description of the program.

  2. Create and use a new variable, e.g. double area; for the area computation.

  3. For π (PI or pi variable or constant) use 4*atan(1).

     atan() is the arctangent function, which gives the angle, in radians, associated with a tangent value; the angle whose tangent is 1 is π/4 in radians (45 degrees), so 4*atan(1) is π.

  4. Display the input values (x1, y1, x2, y2) as well as the output (area),
     e.g. printf("x1 = %g\n",x1); NOT: printf("x1=1\n");.