I keep getting the error messages like uresolved external symbol "int_cdecl rand_int(int,int)"

[chrystianm]

Prompt is to create a menu driven function where the user can choose from making a square or generating lottery numbers or exit the program
#include <iostream>
#include <cstdlib>

using namespace std;

int main()
{

// Declare the variables
int choice;

//Set up the menu selections
cout << "Make a selection \n";
cout << "1. Print a hollow square \n";
cout << "2. Lottery drawing \n";
cout << "3. Exit \n \n";
cin >> choice;

// Declare the variables for the square
int size;
int row = 1;
int column = 1;

// variables for lottery drawing
int rand_int(int min, int max);
unsigned int even = 0, first_ball, second_ball, third_ball;
int number_drawings = 0, drawing_request = 0;

// Set up the selection for the menu
switch (choice)
{
case 1:
cout << "\n \n Enter the size for square: ";
cin >> size;

// Setting the square
while (row <= size)
{
while (column <= size)
{
if (row == 1 or row == size or column == 1 or column == size)
cout << "*";

else
cout << " ";

column++;
}

cout << endl;
row++;
column = 1;
}
break;

case 2:
// Setting up the generator
void lottery();
{
// User input the number of desired drawings
cout << "How many drawing would you wish? ";
cin >> drawing_request;

// Loop for the user input a number zero or less
while (drawing_request <= 0)
{
cout << "Please input a number that is greater than zero.";

cout << "\n \n How many drawing would you wish?";
cin >> drawing_request;
}

// Loop for the random generation of the lottery numbers
while (number_drawings < drawing_request)
{
number_drawings++;

// ball one drawing
first_ball = rand_int(1, 10);

// ball two of the drawing
do

second_ball = rand_int(1, 10);

while (second_ball == first_ball);

//drawing for third ball
do
third_ball = rand_int(1, 10);

while ((second_ball = third_ball) || (first_ball = third_ball));

//Print the generated numbers
cout << "\n \n Generated lottery numbers are: " << first_ball << "-" << second_ball << "-" << third_ball << endl;

if ((first_ball % 2 == 0) && (second_ball % 2 == 0) && (third_ball % 2 == 0))
even++;
}

// the percent of the numbers will come out even
cout << "\n Percentage that the lottery numbers will contain three even numbers: " << 100.0*even / number_drawings << endl;
}
break;

case 3:
// Exit the menu
cout << "\n \n Good Bye!";
break;

}

return 0;
}

[ne555]

http://www.cplusplus.com/forum/general/113904/#msg622050

[Enoizat]

//drawing for third ball
do
third_ball = rand_int(1, 10);

while ((second_ball = third_ball) || (first_ball = third_ball));

It’s the first time I meet this syntax. Is it correct? May a do-while loop be written without braces when there’s just one statement inside it?

[Peter87]

It’s the first time I meet this syntax. Is it correct?

The syntax is valid but the loop will not run correctly because he should have used == instead of = inside the loop condition.

May a do-while loop be written without braces when there’s just one statement inside it?

Yes, same as with if, else, while, for, and even switch though that is kind of useless.

[Enoizat]

Thanks, Peter87 - invaluable, as usual!