TPS 4: Branching

  • Due Feb 24, 2021 by 10am
  • Points 1
  • Submitting a file upload
  • File Types doc and docx
  • Available after Feb 24, 2021 at 9am

Recall the program we wrote that asks the user for LaTeX: mm , LaTeX: xx , and LaTeX: bb and then solves for LaTeX: yy  in the equation LaTeX: y = mx+by=mx+b :

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
 
// Purpose: Solves for y in y=mx*b.
#include <iostream>
using namespace std;

int main(){
    float m, x, b, y;

    // Get the user's input.
    cout << "Please enter m, x, and b (separated by spaces): ";
    cin >> m >> x >> b;

    // Solve for y.
    y = m * x + b;

    // Output result.
    cout << "y = " << y << endl;

    return 0;
}

Suppose we want to allow the user to select to solve for y or LaTeX: xx . If they want to solve for LaTeX: yy , we ask for values for LaTeX: mm , LaTeX: xx , and LaTeX: bb. If they want to solve for LaTeX: xx , however, we will ask for the value of LaTeX: mm , LaTeX: yy , and LaTeX: bb. Here is the mostly completed revised program:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
 
// Purpose: Solves for x or y in y=mx*b.
#include <iostream>
using namespace std;

int main(){
    char varToSolveFor;
    float m, x, b, y;

    // Find out what the user wants to solve for.
    cout << "Which would you like to solve for, [x] or [y]? ";
    cin >> varToSolveFor;

    // Solve for y.
    if(_____________){
        // Get the user's input.
        cout << "Please enter m, x, and b (separated by spaces): ";
        cin >> m >> x >> b;

        // Solve for y.
        y = m * x + b;

        // Output result.
        cout << "y = " << y << endl;
    
    // Solve for x.
    } else if(_____________){
        // Get the user's input.
        cout << "Please enter m, y, and b (separated by spaces): ";
        cin >> m >> y >> b;

        // Solve for x.
        x = (y-b)/m;

        // Output result.
        cout << "x = " << x << endl;

    // Invalid input.
    } else {
        cout << "Invalid option." << endl;
    }

    return 0;
}

Specify what goes in the blanks on lines 14 and 26.

 

After we've completed the group share portion, upload a copy of your updated TPS document.

1614178800 02/24/2021 10:00am