Use float64 instead of int64

hal/instructions.go

@@ -7,7 +7,7 @@ import (
 
 type ProgrammedInstruction struct {
 	Instruction *Instruction
-	Operand     int64
+	Operand     float64
 }
 
 func (pi *ProgrammedInstruction) Execute(module *Module) error {
@@ -23,7 +23,7 @@ func (pi *ProgrammedInstruction) Execute(module *Module) error {
 
 type Instruction struct {
 	Name               string
-	ExecuteWithOperand func(module *Module, operand int64)
+	ExecuteWithOperand func(module *Module, operand float64)
 	Execute            func(module *Module)
 }
 

parser/program_parser.go

@@ -34,7 +34,7 @@ func parseInstruction(input string) (*hal.ProgrammedInstruction, error) {
 		Instruction: instruction,
 	}
 	if len(args) == 1 {
-		operand, err := strconv.ParseInt(args[1], 10, 64)
+		operand, err := strconv.ParseFloat(args[1], 64)
 		if err != nil {
 			return nil, fmt.Errorf("error while parsing operand for instruction '%s': %v", input, err)
 		}