#16: What is the output of the following program AND WHY? #include <iostream> us

Question

#16: What is the output of the following program AND WHY?

#include <iostream>

using namespace std;

int mystery (int x, int y, int z);

int main ()
{
cout << mystery (7, 8, 3) << endl;
cout << mystery (10, 5, 30) << endl;
cout << mystery (9, 12, 11) << endl;
cout << mystery (5, 5, 8) << endl;
cout << mystery (10, 10, 10) << endl;

return 0;
}

int mystery (int x, int y, int z)
{
if (x <= y && x <= z)
return (y + z -x);
else if (y <= z && y <= x)
return (z + x - y);
else
return (x + y - z);
}

Explanation / Answer

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#include <iostream>

using namespace std;

int mystery (int x, int y, int z);

int main ()
{ //each call prints what is returned
cout << mystery (7, 8, 3) << endl;
cout << mystery (10, 5, 30) << endl;
cout << mystery (9, 12, 11) << endl;
cout << mystery (5, 5, 8) << endl;
cout << mystery (10, 10, 10) << endl;

return 0;
}

int mystery (int x, int y, int z)         call 1   call 2    call 3      call 4              call 5
{                                                  x     y    z       x    y    z        x   y   z        x y z              x   y   z
                                                   7    8     3      10 5 30        9 12   11     5   5 8           10   10 10
if (x <= y && x <= z)                     false                 false             true            true                   true
return (y + z -x);                                                                  return 14         return 8 return 10
else if (y <= z && y <= x)               false               true
return (z + x - y);                                              return 35
else
return (x + y - z);                        return 12
}

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