diff --git a/src/main/c/main_taschenrechner.c b/src/main/c/main_taschenrechner.c
index c64ab30..526d9e9 100644
--- a/src/main/c/main_taschenrechner.c
+++ b/src/main/c/main_taschenrechner.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
-// #include <string.h>
+#include <string.h>
 #include <stdlib.h>
+#include <math.h>
 
 #include "taschenrechner.h"
 
@@ -21,6 +22,48 @@ int divide(int a, int b) {
     return a / b;
 }
 
+// scientificmode
+
+int scientificmode(){
+
+    double num, result;
+
+    int choice;
+
+    printf("Enter a number: ");
+
+    scanf("%lf", &num); // scan the number from user
+    
+    printf("Scientific mode Options:\n");
+    printf("1: Square root:\n");
+    printf("2: Exponential:\n");
+    printf("2: Logarithm:\n");
+    printf("4: Trigonomertic");
+    scanf("%d", &choice); // user choice
+
+    switch(choice) {
+
+        case 1: // Square root
+        break;
+
+        case 2: // Exponential
+        break;
+
+        case 3: // Logarithm
+        break;
+
+        case 4: // Trigonomertic 
+        break;
+    
+        default: printf("Invalid choice. Please try again.\n");
+
+    }
+
+    return result;
+}
+
+
+// change mode
 int mode(int userChoice){
 
     switch(userChoice) {
@@ -51,7 +94,6 @@ int mode(int userChoice){
 
 
 // display the mode options:
-
 int displayMenu(){
 
     printf("\nCalculator Modes: \n");