Functions problem displaying the output and intput - c++

Question

I need to write a program that will get 2 integers. The program will then display the
following:
a. The sum of all integers that are both divisible by 4 and 6 between the two numbers inputted.
b. The average of all integers both divisible by 3 and 7 between the two numbers inputted.
I tried doing the code down below:
#include <iostream>
using namespace std;
int Sum46(int a, int b)
{
int sum = 0;
for (int i = a; i <= b; i++) {
if (i % 4 == 0 && i % 6 == 0) {
sum = sum + i;
}
}
return sum;
}
int Sum37(int j, int k)
{
int sum1 = 0;
for (int i = j; i <= k; i++) {
if (i % 3 == 0 && i % 7 == 0) {
sum1 = sum1 + i;
}
}
return sum1;
}
int Count(int f, int g)
{
int inputCount = 0;
for (int i = f; i < g; i++) {
if (i % 3 == 0 && i % 7 == 0) {
inputCount++;
}
}
return inputCount;
}
int Ave(int t, int u)
{
int total = 0;
total = t / u;
return total;
}
void display(int o, int l)
{
cout << "The sum of all integers that are both divisible by 4 and 6 between two numbers is " << o << endl;
cout << "The sum of all integers that are both divisible by 3 and 7 between two numbers is " << l << endl;
}
int main()
{
int num1, num2;
int probA, probB, comp, bilang;
cout << "Input first number : ";
cin >> num1;
cout << "Input second number : ";
cin >> num2;
probA = Sum46(num1, num2);
comp = Sum37(num1, num2);
bilang = Count(num1, num2);
probB = Ave(comp, bilang);
display(probA, probB);
return 0;
}
My expected result should be
Input first number : 4
Input second number : 12
The sum of all integers that are both divisible by 4 and 6 between two numbers is 12
The sum of all integers that are both divisible by 3 and 7 between two numbers is 0
"since 12 is the only number that is both divisible by 4 and 6 and no number is divisible by 3 and 7 on the inputted numbers."
But the actual results are
Input first number : 4
Input second number : 12
"That is the only result and I was not able to produce any output of the functions"

Answer 1

You have to check for the case where u is 0.
Change this:
int Ave(int t, int u)
{
int total = 0;
total = t / u;
return total;
}
To this:
int Ave(int t, int u)
{
if( u == 0 )
return -1;
return t/u;
}