#include
using namespace std;
int main() {
/// declare integer variables x1, y1, x2, y2
/// prompt the user for input with cout and get the input with cin
/// check whether the slope is defined or not, if not bail
/// compute the slope and store it in the variable of type double named slope.
/// Report what the slope is.
/// Compute the coordinates of the midpoint of the line segment and report
/// prompt the user for an x-value and store this in a variable of type double
/// compute the corresponding y-value on the line through (x1,y1) and (x2,y2)
/// and report that
}
/* Here is the output of a sample run for this code:
Enter coordintates for (x1,y1) and (x2,y2), in that order: 0 1 2 2
The slope of the line through (0,1) and (2,2) is 0.5
The coordinates of the midpoint connecting 0,1) and (2,2) are (1,1.5)
Enter another x value to find the corresponding y-value on the line:3
The y-value corresponding to x = 3 is 2.5 */