how do i return multiple values from a function in c++

Question

I want to return two float variables from a bool function althought i dont know how to do it. What should i write in main? Here is my code.

bool triwnymo(int a, int b, int c, float& x1, float& x2){
    
    int d;
    d=diak(a,b,c);
    if(d>0){
        x1=(-b+sqrt(d))/(2*a);
        x2=(-b-sqrt(d))/(2*a);
        return x1,x2;
        return true;
    }else if(d==0){
        x1=-b/(2*a);
        x2=x1;
        return x1,x2;
        return true;
    }else{
        return false;
    }
}

Answer 1

You can use a custom data structure to return as many values you like:

struct triwnymo_result_type {
     float root1 = 0.0;
     float root2 = 0.0;
     bool has_solution = false;
};

triwnymo_result_type triwnymo(int a, int b, int c){        
    int d = diak(a,b,c);
    if(d>0) {
        return  {(-b+sqrt(d))/(2*a), (-b-sqrt(d))/(2*a), true};
    } else if(d==0) {
        int x=-b/(2*a);
        return {x,x,true};
    } else {
        return {0.0,0.0,false};
    }
}

Note that return x1,x2; is using the comma operator. The comma operator evaluates both operands, discards the first and results in the value of the latter. Thats not what you want. Also return true; after you already returned from the function is never reached. You can only return from a function once.

I didn't want to change too much, but you don't really need to distinguish between d>0 and d==0 because when d==0 then -b+sqrt(d) == -b-sqrt(d) == -b.