Why doesn't my code run when it says that my build successful?

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Hi guys, I'm new to C#.
I'm not sure why my code doesn't want to run.
Once I start to run my code, nothing comes up on the cmd prompt.
It just shows a blank screen.

What I have tried:

I have to write a C# console program that converts temperature in degrees Celsius to degrees Fahrenheit.
Showing all values from –40 degrees Celsius to +40 degrees Celsius in steps of 5 degrees.

This is what I got so far:

C#

<pre>
using System;
namespace TemperatureConverter
{
    class Program
    {
        static void Main()
        {
            int c, f;
            for (c = -40; c <= 40; c =+ 5);
            f = 9 / 5 * c + 32;
            Console.WriteLine("c: {0}; f: {1}", c, f);
        }
    }
}

I don't know if my code is right or not.
Your assistance is much appreciated.

Posted 25-May-18 4:50am

Member 13652359

Updated 25-May-18 5:25am

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OriginalGriff · Accepted Answer · 2018-05-25T05:27:00

You've made quiet a few errors there:

C#

for (c = -40; c <= 40; c =+ 5);

The semicolon at the end will terminate the loop - so it will never do anything
inside the body. Remove the semicolon.
And the increment operator is wrong as well:

C#

c=+ 5

means "set c to 5", not "add 5 to c". You probably want

C#

c += 5

for (c = -40; c <= 40; c =+ 5);
f = 9 / 5 * c + 32;
Console.WriteLine("c: {0}; f: {1}", c, f);

If you want more than one statement inside your loop, you need a compound statement - which is a fancy way of saying "put curly brackets round them".
9 and 5 are integers, so 9 / 5 is also an integer: 1. You need floating point values: 9.0 and 5.0 instead.
There's one other problem as well: if you fix this and run this code in the debugger, you probably won't see anything as the command prompt will open, print and shut really quickly. Add

Console.ReadLine();

at the end, and it will pause until you press ENTER.
Try this:

static void Main()
    {
    float c, f;
    for (c = -40; c <= 40; c += 5)
        {
        f = 9.0 / 5.0 * c + 32;
        Console.WriteLine("c: {0}; f: {1}", c, f);
        }
    Console.ReadLine();
    }