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#include<stdio.h>
#include<math.h>
 
void text(void)
{
printf("Bitte gib Fall ein\n");
}
 
void textfall(void)
{
printf("Bitte gib Zahl ein\n");
}
 
float Rechnung1(float a, float b)
{
return (a * b);
 
}
 
float Rechnung2(float a, float b)
{
return (a / b);
}
 
int main()
{
int Fall;
float ergebnis1 = Rechnung1(x,y);
float ergebnis2 = Rechnung2(x,y);
text();
scanf_s("%i", &Fall);
 
switch (Fall)
{
 
case 1: 
	textfall();
	scanf_s("%f", &x);
	textfall();
	scanf_s("%f", &y);
	Rechnung1(x, y);
	printf("Die Anwort heißt: %f \n",ergebnis1);
	break;
case 2:
	textfall();
	scanf_s("%f", &x);
	textfall();
	scanf_s("%f", &y);
	Rechnung2(x,y);
	printf("Die Anwort heißt: %f \n", ergebnis2);
	break;
 
}
 
 
return 0;
}

prog.c: In function ‘main’:
prog.c:28:29: error: ‘x’ undeclared (first use in this function)
 float ergebnis1 = Rechnung1(x,y);
                             ^
prog.c:28:29: note: each undeclared identifier is reported only once for each function it appears in
prog.c:28:31: error: ‘y’ undeclared (first use in this function)
 float ergebnis1 = Rechnung1(x,y);
                               ^
prog.c:31:1: warning: implicit declaration of function ‘scanf_s’; did you mean ‘scanf’? [-Wimplicit-function-declaration]
 scanf_s("%i", &Fall);
 ^~~~~~~
 scanf

Standard output is empty