Why the output here is 0 not 25?

Question

#include <iostream>
using namespace std;

int main() {
int b=5;
for (int i=0;i<6;i++){
b*=i;
}
cout<< b;
return 0;
}

Answer 1

Does it multiply all the answers? Like
5*0=0;
5*1=5;
5*2=10;
5*3=15;
5*4=20;
5*5=25;
0*5*10*15*20*25=0
?

Answer 2

Aha, got it, thanks :-)

Answer 3

i = 0
5*0= 0;
and so on..
start with
i = 1;

Answer 4

b*=5;
is b = b*5!
So every time
0 = 0*1;
0 = 0*2;
.....
...
Got it?