diff --git a/src/main/c/Calculator/calculator.c b/src/main/c/Calculator/calculator.c
index b7f10ce..7a570bc 100644
--- a/src/main/c/Calculator/calculator.c
+++ b/src/main/c/Calculator/calculator.c
@@ -64,7 +64,13 @@ int main() {
                 result = modulus(num1, num2);
                 printf("Result: %lf\n", result);
                 break;
-                    case :
+                case 7:
+                printf("Enter a number: ");
+                scanf("%lf", &num1);
+                result = logarithm(num1);
+                printf("Result: %lf\n", result);
+                break;
+                case :
                 printf("Exiting...\n");
                 break;
             default: