diff --git a/calculator.c b/calculator.c
new file mode 100644
index 0000000..5c5a779
--- /dev/null
+++ b/calculator.c
@@ -0,0 +1,30 @@
+// Performs addition, subtraction, multiplication or division depending the input from user
+# include <stdio.h>
+int main() {
+    char operator;
+    double firstNumber,secondNumber;
+    printf("Enter an operator (+, -, *,): ");
+    scanf("%c", &operator);
+    printf("Enter two operands: ");
+    scanf("%lf %lf",&firstNumber, &secondNumber);
+    switch(operator)
+    {
+        case '+':
+            printf("%.1lf + %.1lf = %.1lf",firstNumber, secondNumber, firstNumber + secondNumber);
+            break;
+        case '-':
+            printf("%.1lf - %.1lf = %.1lf",firstNumber, secondNumber, firstNumber - secondNumber);
+            break;
+        case '*':
+            printf("%.1lf * %.1lf = %.1lf",firstNumber, secondNumber, firstNumber * secondNumber);
+            break;
+        case '/':
+            printf("%.1lf / %.1lf = %.1lf",firstNumber, secondNumber, firstNumber / secondNumber);
+            break;
+        // operator doesn't match any case constant (+, -, *, /)
+        default:
+            printf("Error! operator is not correct");
+    }
+    
+    return 0;
+}