im not sure if im calling the bool function correctly or if something is messed up in the function itself or the main function.
this is the bool function:

bool aretheyvalid (int x, int y, int z) {
int invalid=0, valid=0;
bool ans;
if (x && y && z >= 0 && x && y && z <= 100) {
valid++;
ans=true;
}
else {
if (x < 0)
cout<< x << " is too small" << endl;
if (y < 0)
cout<< y << " is too small" << endl;
if (z < 0)
cout<< z << " is to small" << endl;
if (x >100)
cout<< x << " is too big" << endl;
if (y > 100)
cout<< y << " is too big" << endl;
if (z > 100)
cout<< z << " is too big" << endl;
ans=false;
}
invalid++;
return ans;
return valid;
return invalid;
}

this is the part of the main function with bool;

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bool ans;
ans= aretheyvalid(test1, test2, test3);
if (ans) {
cout<< "this group is valid" << endl;
}
else {
cout<< "this group is invalid" << endl;
}

the too small and too big part work fine in the bool function. the main function doesnt seem to be working right. i need it to say invalid when x, y, or z are above 100 or below 0. thank you

So, your flow of execution reaches invalid++; , and does that (i.e. increments the value of invalid) and then reaches return ans;, so the fnuction ends, and returns the value ans to the calling function.

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return valid;
return invalid;

These will never ever be executed, because the function has already ended. What are you trying to do here?

if (x && y && z >= 0....
This is just wrong. You've clearly said to yourself something like:
"if x and y and z are greater than zero"
and tried to convert English into C++. That won't work. You can't translate English into C++.
I expect you meant this:

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if (x >=0 && // if x is bigger than or equal to zero AND
y > = 0 && // if y is bigger than or equal to zero AND
z >= 0 && // if z is bigger than or equal to zero AND
x <= 100 && // if x is smaller than or equal to one hundred AND
y <= 100 && // if x is smaller than or equal to one hundred AND
z <= 100) // if x is smaller than or equal to one hundred