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#include <stdio.h>
#include <math.h>
 
int main(void) {
 
	{
 
	double a, c, l; //Gesamtlänge, Abstand Meer, Abstand Land
 
	}
 
	/*maximale Lauflänge berechnen*/
	l = (a^2 + c^2)^0.5;
 
	return 0;
				}

prog.c: In function ‘main’:
prog.c:8:15: warning: unused variable ‘l’ [-Wunused-variable]
  double a, c, l; //Gesamtlänge, Abstand Meer, Abstand Land
               ^
prog.c:8:12: warning: unused variable ‘c’ [-Wunused-variable]
  double a, c, l; //Gesamtlänge, Abstand Meer, Abstand Land
            ^
prog.c:8:9: warning: unused variable ‘a’ [-Wunused-variable]
  double a, c, l; //Gesamtlänge, Abstand Meer, Abstand Land
         ^
prog.c:13:2: error: ‘l’ undeclared (first use in this function)
  l = (a^2 + c^2)^0.5;
  ^
prog.c:13:2: note: each undeclared identifier is reported only once for each function it appears in
prog.c:13:7: error: ‘a’ undeclared (first use in this function)
  l = (a^2 + c^2)^0.5;
       ^
prog.c:13:13: error: ‘c’ undeclared (first use in this function)
  l = (a^2 + c^2)^0.5;
             ^

Standard output is empty