Assume that a function named swapdoubles has been defined and is available for use in this exercise: that function receives two variables of type double and exchanges their values. Write the definition of a function named sort3 that is passed three double variables. The function returns nothing but modifies the values of these variables so they are in sorted order. So, if a, b and c have (respectively) the values 3.14, 2.71, and 3.04, and the invocation sort3(a,b,c) is made, then upon return, the values of a, b and c will be 2.71, 3.04, and 3.14 respectively.

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This is the answer:

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void sort3 (double &a, double &b, double &c){
   if (a>b) swapdoubles (a,b);

   if (b>c) swapdoubles (b,c);

   if (a>b) swapdoubles (a,b);
}

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