I am currently taking a course in c#. One of the exercises is the following.

Ask the user to enter the ring colors of the first 3 rings as text (e.g. green). Then show the value of this resistor. So if the user enters in sequence: red - purple - red

Then the program will show:

This resistor has value of 2700 Ohms

I want to solve this with “if and els is”. I already have the following code but I am stuck on one part.

Console.WriteLine("Enter the first ring color");
string firstRingColor = Console.ReadLine();

Console.WriteLine("Enter the second ring color");
string secondRingColor = Console.ReadLine();

Console.WriteLine("Enter the third ring color");
string thirdRingColor = Console.ReadLine();

if (firstRingColor =="black" || secondRingColor =="black" || thirdRingColor == "black")
{
    Console.WriteLine("0");
}
else if (firstRingColor == "brown" || secondRingColor == "brown" || thirdRingColor == "brown")
{
    Console.WriteLine("1");
}

with the execution of this program it only executes the last part. Is there a way to save the result and display it afterwards

CodePudding user response：

Here's your homework code

NOTE that this code is for 5- and 6-band resistors and your sample of red-purple-red calculates to 2700ohm for 4-band resistors, so you need to enter 'red-purple-black-red' to convert it to 5- and 6-band format... or you can remove reading r3

// entry point
void Main()
{
    // define the values associated with colors for resistivity
    var rColorValues = new Dictionary<string, float> {
        {"black",0},
        {"brown",1},
        {"red", 2},
        {"gold",3},
        {"yellow",4},
        {"green",5},
        {"blue",6},
        {"purple",7},
        {"silver",8},
        {"white",9},
    };

    // colors associated with the multiplier ring
    // similar strategy can be used for tolerance and temperature coefficient rings, not shown here
    var multColorValues = new Dictionary<string, float>{
        {"black", 1},
        {"brown", 10},
        {"red",   100},
        {"gold",  1000},
        {"yellow",10000},
        {"green", 100000},
        {"blue",  1000000},
        {"purple",10000000},
        {"silver",0.01f},
    };
    
    // read the colors for 3 rings.This works for 5 and 6-band resistors
    // for 4-band resistor the third ring has to be 'black'
    float r1 = ReadColorValue("First ring:", rColorValues);
    float r2 = ReadColorValue("Second ring:", rColorValues);
    float r3 = ReadColorValue("Third ring:", rColorValues);
    
    // get the color for the multiplier ring
    float mult = ReadColorValue("Multiplier ring:", multColorValues);
    
    // calculate the ohms
    int ohms = (int)((r1*100 r2*10 r3)*mult);

    Console.WriteLine($"{ohms} Ohm resistor");
}

// this method writes the prompt, reads a line and returns the value from the dictionary, if one matches
float ReadColorValue(string prompt, Dictionary<string, float> colorToValueMap)
{
    while (true) // keep asking for input until a valid one is received
    {
        Console.Write(prompt);
        var consoleInput = Console.ReadLine().ToLower();
        if (colorToValueMap.ContainsKey(consoleInput)){
            // if the color name is found - return the value associated with it
            return colorToValueMap[consoleInput];
        }
        // ... otherwise - help the user
        Console.Error.WriteLine("Unknown value. Enter one of: " string.Join(", ",colorToValueMap.Keys));
    }   
}

CodePudding user response：

@sten petrov Thanks again for the reply Sten. But I would like to correct a few things this is not homework but a series of exercises for learning from it. I can understand that this is very simple for you. But for me it is quite difficult. I try to do my best but I don't always find the right search terms. I will look at your code tomorrow in detail and I will try to understand it. If I have any questions about it may I contact you?

CodePudding user response：

Based on the code, I'm going to write my own tomorrow. Can I then upload this here tomorrow for you guys to review?