@ -1,5 +1,5 @@
#ifndef TASCHENRECHNER_H
#define TASCHENRECHNER_H
#ifndef CALCULATOR
#define CALCULATOR
// add function
double add(double a, double b);
@ -87,4 +87,4 @@ double ConTime(double time, int startingUnit, int endingUnit);
int performOperation(int num1, char operator, int num2);
#endif // TASCHENRECHNER_H
#endif // CALCULATOR