how to solve this using c++?

f. ole nd nd CONCEPT: 49 A program may be broken up into manageable functions. 4,10 A function call is a statement that causes a function to execute. A function definition contains the statements that make up the function. tate 9. Program 4.3 is a program that reads 3 integers from the keyboard, calculates the average and display the average. Instead of putting all statements in function main(), the program is broken up into three small and simple functions; and function main(). 1 2 3 4 // Program 4.3 //This program reads 3 integers from keyboard, //calculate the average and display the average. #include using namespace std; 5 6 7 8 9 int getAnInteger (void) { int value; cout > value; return (value); } 10 11 12 13 14 15 16 17 18 19 20 float calculateAverage (int x, int y, int z) 1 return (x + y + 2)/3.0; } void displayAverage (float avg) { ne 21 22 23 cout using namespace std; 5 6 7 8 9 int getAnInteger (void) { int value; cout > value; return (value); } 10 11 12 13 14 15 16 17 18 19 20 float calculateAverage (int x, int y, int z) 1 return (x + y + 2)/3.0; } void displayAverage (float avg) { ne 21 22 23 cout