diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..90c16e63
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+# Compiled binaries
+calculator
+
+# Object files
+*.o
+*.out
+
+# Executable
+a.out
diff --git a/main.c b/main.c
index c28a37be..e6b3c1e1 100644
--- a/main.c
+++ b/main.c
@@ -1,9 +1,49 @@
+#include <stdio.h>
+
 int main()
 {
-  int i;
-  for (i = 0; i < 10; i++)
+  char operator;
+  double num1, num2, result;
+
+  printf("Simple Calculator\n");
+  printf("=================\n");
+  printf("Enter an operation (+, -, *, /): ");
+  scanf(" %c", &operator);
+
+  printf("Enter first number: ");
+  scanf("%lf", &num1);
+
+  printf("Enter second number: ");
+  scanf("%lf", &num2);
+
+  switch (operator)
   {
-    printf("Holberton\n");
+    case '+':
+      result = num1 + num2;
+      printf("%.2f + %.2f = %.2f\n", num1, num2, result);
+      break;
+    case '-':
+      result = num1 - num2;
+      printf("%.2f - %.2f = %.2f\n", num1, num2, result);
+      break;
+    case '*':
+      result = num1 * num2;
+      printf("%.2f * %.2f = %.2f\n", num1, num2, result);
+      break;
+    case '/':
+      if (num2 != 0)
+      {
+        result = num1 / num2;
+        printf("%.2f / %.2f = %.2f\n", num1, num2, result);
+      }
+      else
+      {
+        printf("Error: Division by zero!\n");
+      }
+      break;
+    default:
+      printf("Error: Invalid operator!\n");
   }
+
   return 0;
 }