Added graph mode for testing with basic sin function table

src/main/c/main_taschenrechner.c

@@ -22,9 +22,10 @@ int divide(int a, int b) {
     return a / b;
 }
 
+// 
 // scientificmode
 
-int scientificmode(){
+int scientificMode(){
 
     double num, result;
 
@@ -62,6 +63,25 @@ int scientificmode(){
     return result;
 }
 
+// graphMode
+void graphMode() {
+    double x, y;
+
+    printf("Enter the range for x (start end step): ");
+    double x_start, x_end, x_step;
+    scanf("%lf %lf %lf", &x_start, &x_end, &x_step);
+
+    printf("\nGraph for the function y = sin(x):\n");
+
+    printf(" x\t| y\n");
+    printf("--------------\n");
+
+    for (x = x_start; x <= x_end; x += x_step) {
+        y = sin(x);
+        printf("%.2lf\t| %.2lf\n", x, y);
+    }
+}
+
 
 // change mode
 int mode(int userChoice){