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<p>Suppose you are given two (x,y) coordinates [(x1,y1) and (x2,y2)] in the Cartesian plane which are used to define a line, y = f(x).</p>
<p>If you are provided a value, x0, find the value of y0 such that y0 = f(x0).</p>
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Comments, history, license, etc.
 
Copied from problem cpp/var-expr/gpa (author: redekopp@usc.edu)
Copied from problem cpp/var-expr/in_n_days (author: redekopp@usc.edu)
Copied from problem cpp/var-expr/char_arith (author: redekopp@usc.edu)
Copied from problem cpp/var-expr/hello (author: daveagp@gmail.com)
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Engine
Template / Reference solution
 
#include <iostream>
#include <iomanip>
using namespace std;
int main() {
   // declare variables here
   \[
      double x1, y1, x2, y2, x0, y0;
   ]\
   
   cout << "Enter the x1 y1 x2 and y2: " << endl;
  \[
   cin >> x1 >> y1 >> x2 >> y2;
  ]\
   cout << "Now enter a value for x0: " << endl;
  \[
   cin >> x0;
  ]\
  // Compute y0
  \[
   double m = (y2 - y1) / (x2 - x1);
   y0 = y1 - m*(x1 - x0);  
   
  ]\
     cout << "The point on the line should be (x0,y0) = (" << x0 << "," << y0 << ")" << endl;
   
  return 0;
}
C++ test suite
json list of stdin/args tests
e.g. [{"stdin":"hi", "args":["4", "5"]},
{"stdin":"noargs"}]

to just run once with no input use [{}]
 
[
   {"stdin":"1.0 5.0 2.0 7.0 0.0", "args":[]},
   {"stdin":"0.0 5.5 5.5 0.0 6.0", "args":[]}
   
]
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Note: problems are open-source by default (see 'Public permissions'). Assumed license for open problems is Creative Commons 4.0 Attribution-ShareAlike unless specified in 'Remarks'.