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#include<stdio.h>
double get_double(); // Funktion deklarieren
main(){
double e = 0;
e=get_double(); //Funktion aufrufen
printf("d = %f\n\n",e);
}
double get_double() {
double d = 0;
scanf("%lf", &d); // <--- da war dein fehler
return d;
}