Ich würd was in der Art machen:
double calculateResult(double a, double b, int operator) {
if (operator%4==0)
return a+b;
if (operator%4==1)
return a-b;
if (operator%4==2)
return a*b;
if (operator%4==3)
return a/b;
}
loop() {
for (int t=0; t<16;t++) {
//...
double result = calculateResult(calculateResult(1, 3, t/4), 9, t);
//...
}
}