initial commitHEADmain

1 files changed, 49 insertions, 0 deletions

diff --git a/src/calculator.d b/src/calculator.d
new file mode 100644
index 0000000..c7933be
--- /dev/null
+++ b/src/calculator.d
@@ -0,0 +1,49 @@
+import std.stdio;
+import std.string;
+
+class InvalidOperatorException : Exception {
+	this(string msg, string file = __FILE__, size_t line = __LINE__) {
+		super(msg, file, line);
+	}
+}
+
+float calculate(char[] operator, float number1, float number2) {
+	foreach (c; operator) {
+		switch(c) {
+				case '+':
+					return number1 + number2;
+				case '-':
+					return number1 - number2;
+				case '/':
+					return number1 / number2;
+				case '*':
+					return number1 * number2;
+				default:
+					continue;
+		}
+	}
+	throw new InvalidOperatorException("invalid operator used!");
+}
+
+void main() {
+	char[] operator;
+	float number1;
+	float number2;
+	write("enter a number: ");
+	readf("%f", &number1);
+
+	write("enter an operator: ");
+	readf(" %s\n", &operator);
+
+	write("enter another number: ");
+  readf(" %f", &number2);
+
+	float result;
+	try {
+		result = calculate(operator, number1, number2);
+	} catch (InvalidOperatorException e) {
+		writeln(e);
+	}
+
+	writeln(result);
+}