help with identifier

i super new to c++ and i'm taking the second semester course, which i never took the first, so it's kinda hard for me with the syntax and all. here's my issue:

Code:

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int getMenuOption()
{
int menuOption;

cout << "Please make a selection:" << endl;
cout << "1. Enter information for a plane." << endl;
cout << "2. View information for a plane." << endl;
cout << "3. Exit the program." << endl;

menuOption = getValidInt("Enter the menu option: "); // <-- 'getValidInt': identifier not found
return menuOption;
}

int getValidInt(char *prompt)
{ // <-- 'getValidInt' : redefinition; previous definition was 'formerly unknown identifier'
const int MAX = 80;
char buffer[MAX];
int i;
cout << prompt;
cin.getline(buffer, MAX);

while (strlen(buffer) != strspn(buffer, "1234567890"))
{
cout << "Invalid integer - please re-enter: ";
cin.getline(buffer, MAX);
}

i = atoi(buffer);
return i;
}

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i hope this is all the code needed to figure it out. thanks

Code:

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int getValidInt(char *prompt);

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Put that at the top right after including the necessary headers.

If you indent your code, you will find it much easier to follow, and people on message board will be more inclined to help you.