Code Error Modification - c++

Question

I have an assignment where i should make code that draw a vertical triangular wave But here is a problem the function which is drawOnePeriod that calls the function drawwave calls it with a constant number 5 , this number determines the amplitude for the wave however, if i want to change this number to modify the amplitude , it mess up the pattern so i was wondering if i can get some help anywhere cause i can't think of a relation.
# include <iostream>
using namespace std;
void drawOnePeriod(int periodLength)
{
int z = 10;
for (int i = 1; i < periodLength; i++)
{
for (int j = 0; j <= z; j++)
{
cout << " ";
}
z++;
cout << "*" << endl;
}
for (int i = 1; i <= 3 + periodLength; i++)
{
for (int j = 0; j <= z; j++)
{
cout << " ";
}
z--;
cout << "*" << endl;
}
for (int i = 1; i < periodLength; i++)
{
for (int j = 0; j <= z; j++)
{
cout << " ";
}
z++;
cout << "*" << endl;
}
}
void drawWave(int nPeriods)
{
for (int i = 1; i <= nPeriods; i++)
{
drawOnePeriod(5);
}
}
int main()
{
int n;
cin >> n;
drawWave(n);
}

Answer 1

It would really help if you included what output you expect.
Here is my interpretation of a "vertical triangular wave"
#include <stdio.h>
int main(void) {
int amplitude = 8;
int cycles = 3;
int delta = +1;
int i=1;
while (cycles --> 0)
{
for(; i>=1 && (i<=amplitude) ; i += delta)
{
printf("%*s\n", i, "*");
}
i += 2*(delta = -delta);
}
return 0;
}
IDEOne Link
Output
Success #stdin #stdout 0s 4448KB
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*