Print statement after for loop generating an additional iteration - c++

Question

I am very much a beginner in C++ and was just delving into for loops when I ran into a problem that I solved by winging it and not by understanding.
My script adds numbers from 1 to 10 and calculates the average. The thing is that I had to introduce a new variable "number", other than "sum" and "count", to not have the average be wrong.
#include <iostream>
int main ()
{
float count, sum, avg, number;
sum=avg=number=0.0;
for (count=1.0;count<=10.0;count+=1.0)
{
sum=sum+count;
avg=sum/count;
number=count;
}
printf("\n\nThe number of iterations is %1.f",number);
printf("\nThe sum of the numbers between 1 and 10 is = %.1f",sum);
avg=sum/number;
printf("\nThe average is %.1f",avg);
}
Produces the right result, but
#include <iostream>
int main ()
{
float count, sum, avg;
sum=avg=0.0;
for (count=1.0;count<=10.0;count+=1.0)
{
sum=sum+count;
avg=sum/count;
}
printf("\n\nThe number of iterations is %1.f",count);
printf("\nThe sum of the numbers between 1 and 10 is = %.1f",sum);
avg=sum/count;
printf("\nThe average is %.1f",avg);
}
Gives one more iteration than I expected and causes the average to be wrong. I assume that maybe calling "count" to print adds up but have no certainty and would really like to know why. Sorry if the question but I couldn't figure it out.

Answer 1

In this loop
for (count=1.0;count<=10.0;count+=1.0)
{
sum=sum+count;
avg=sum/count;
number=count;
}
number can not be greater than 10.0.
But in this loop
for (count=1.0;count<=10.0;count+=1.0)
{
sum=sum+count;
avg=sum/count;
}
count is greater than 10.0 after exiting the loop due to the condition count<=10.0.
So these statements
avg=sum/number;
and
avg=sum/count;
produce different results because number and count are unequal after the loops.