C++ How to Program, 10/e

... each mangled name (other than main) begins with two underscores (__) followed by the letter Z, a number and the function name. The number that follows Z specifies how many characters are in the function’s name. For example, function square

Fig. 6.21 Name mangling to enable type-safe linkage.

Alternate View

 1   // Fig. 6.21: fig06_21.cpp
 2   // Name mangling to enable type-safe linkage.
 3
 4   // function square for int values
 5   int square(int x) {
 6      return x * x;
 7   }
 8
 9   // function square for double values
10   double square(double y) {
11      return y * y;
12   }
13
14   // function that receives arguments of types
15   // int, float, char and int&
16   void nothing1( ...