Take four doubles from the command line, x1,y1 and x2,y2 (representing 2D * coor

Question

Take four doubles from the command line, x1,y1 and x2,y2 (representing 2D
* coordinates) and compute the slope described by the line. The slope formula
* is:
*           (y2 - y1)
*   slope = ---------
*           (x2 - x1)
*
* Print the usage message: "Usage: h4 x1 y1 x2 y2" if not enough parameters
* are provided. The output should be:
* slope of (x1,y1) to (x2,y2) is slope
* Print the input coordinates to 2 decimal places and the slope
* itself to 4 decimal places.
*
* Example input/output:
* ./h4 1 2.5 -11.5 6

* slope of (1.00,2.50) to (-11.50,6.00) is -0.2800

int main(int argc, char *argv[])
{

return 0;
}

Explanation / Answer

#include #include /* * coordinates) and compute the slope described by the line. The slope formula * is: * (y2 - y1) * slope = --------- * (x2 - x1) * * Print the usage message: "Usage: h4 x1 y1 x2 y2" if not enough parameters * are provided. The output should be: * slope of (x1,y1) to (x2,y2) is slope * Print the input coordinates to 2 decimal places and the slope * itself to 4 decimal places. * * Example input/output: * ./h4 1 2.5 -11.5 6 * slope of (1.00,2.50) to (-11.50,6.00) is -0.2800 */ int main(int argc, char *argv[]) { if(argc == 5) { double x1 = atof(argv[1]); double y1 = atof(argv[2]); double x2 = atof(argv[3]); double y2 = atof(argv[4]); double slope = (y2 - y1) / (x2 - x1); printf("slope of (%.2lf,%.2lf) to (%.2lf,%.2lf) is %.4lf ", x1, y1, x2, y2, slope); } else { printf("Usage: h4 x1 y1 x2 y2 "); } return 0; }

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