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C# solution for exercises 1~8 #4

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44f7b1b
Add Rider idea folder to gitignore
mark-allott Sep 12, 2025
efea802
Fix-up off-by-1 values for the misc operands
mark-allott Sep 12, 2025
67ed755
Initial solution, project, plus Exercise 1 work
mark-allott Sep 13, 2025
3b51eb9
Refactor to use a common method to run a VM for all exercises
mark-allott Sep 13, 2025
766c5e6
Add Exercise 2 work, including boot file
mark-allott Sep 13, 2025
4e144da
Add Exercise 3 work, including boot and output file
mark-allott Sep 13, 2025
99f4f42
fix-up Rider warnings
mark-allott Sep 14, 2025
46753fe
Add exercise 4 work, inclusive of boot and output files
mark-allott Sep 14, 2025
ab5d7e6
Add exercise 5 work, inclusive of refuel, boot and output files
mark-allott Sep 14, 2025
c97bdef
Add exercise 6 work, inclusive of boot file
mark-allott Sep 14, 2025
16b89d8
Add exercise 7 work, including fixing up the VM with a Sub method
mark-allott Sep 17, 2025
92e16b9
Merge remote-tracking branch 'origin/main' into mark-csharp
mark-allott Sep 17, 2025
4cc693f
Work for exercise 8, plus input file and boot file
mark-allott Sep 17, 2025
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1 change: 1 addition & 0 deletions .gitignore
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Expand Up @@ -6,3 +6,4 @@ riderModule.iml
YODA_Python/venv/
YODA_TypeScript/node_modules/
YODA_Python/__pycache__/
.idea/
10 changes: 5 additions & 5 deletions YODA/OpCodes.cs
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Expand Up @@ -10,11 +10,11 @@ public static class OpCode
{
// Misc (opcodes without operands)
public const byte Halt = 0b0000_0000; // 00
public const byte Wait = 0b0000_0001; // 00
public const byte Ret = 0b0000_0011; // 02
public const byte Nop = 0b0000_0100; // 03
public const byte Sif = 0b0000_0101; // 04
public const byte Cif = 0b0000_0110; // 05
public const byte Wait = 0b0000_0001; // 01
public const byte Ret = 0b0000_0010; // 02
public const byte Nop = 0b0000_0011; // 03
public const byte Sif = 0b0000_0100; // 04
public const byte Cif = 0b0000_0101; // 05

public const byte SaveToFileMMM = 0b0001_0000; //16
public const byte SaveToFileMMI = 0b0001_0001; //17
Expand Down
18 changes: 17 additions & 1 deletion YODA/VirtualMachine.cs
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Expand Up @@ -84,7 +84,9 @@ public async Task Run(string folderPath)
Add(opCode);
continue;
case Mask.Sub:
throw new Exception("Due to lack of time this method has not been implemented");
// throw new Exception("Due to lack of time this method has not been implemented");
Sub(opCode);
continue;
case Mask.Inc:
Inc(opCode);
continue;
Expand Down Expand Up @@ -405,4 +407,18 @@ private byte Read(int location,int opCode, int mask)

return _memory[reference];
}

/// <summary>
/// Sub LHS RHS Total
/// </summary>
private void Sub(int opCode)
{
var lhs = Read(_instructionPointer + 1, opCode, 2);
var rhs = Read(_instructionPointer + 2, opCode, 1);
var location = Read(_instructionPointer + 3, opCode, 0);

if (Debug) Console.WriteLine($"{_instructionPointer:x4} Sub:: {lhs} - {rhs} = {lhs - rhs} ==> {location:x2}");
_memory[location] = (byte)(lhs - rhs); // Can overflow
_instructionPointer += 4;
}
}
56 changes: 56 additions & 0 deletions mark-csharp.sln
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1 change: 1 addition & 0 deletions mark-csharp/Files/9.txt
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5 4 3 2 1 LIFTOFF
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