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- /* Demonstrates structures that contain other structures. */
-
- /* Receives input for corner coordinates of a rectangle and
- calculates the area. Assumes that the y coordinate of the
- upper-left corner is greater than the y coordinate of the
- lower-right corner, that the x coordinate of the lower-
- right corner is greater than the x coordinate of the upper-
- left corner, and that all coordinates are positive. */
-
- #include <stdio.h>
-
- int length, width;
- long area;
-
- struct coord{
- int x;
- int y;
- };
-
- struct rectangle{
- struct coord topleft;
- struct coord bottomrt;
- } mybox;
-
- main()
- {
- /* Input the coordinates */
-
- printf("\nEnter the top left x coordinate: ");
- scanf("%d", &mybox.topleft.x);
-
- printf("\nEnter the top left y coordinate: ");
- scanf("%d", &mybox.topleft.y);
-
- printf("\nEnter the bottom right x coordinate: ");
- scanf("%d", &mybox.bottomrt.x);
-
- printf("\nEnter the bottom right y coordinate: ");
- scanf("%d", &mybox.bottomrt.y);
-
- /* Calculate the length and width */
-
- width = mybox.bottomrt.x - mybox.topleft.x;
- length = mybox.bottomrt.y - mybox.topleft.y;
-
- /* Calculate and display the area */
-
- area = width * length;
- printf("The area is %ld units.", area);
- }
-