c++ post-decrement
I have a query. When i enter 4, why is the result 24? Can someone explain in details?
#include <iostream>
using namespace std;
int main()
{
int num, result =1;
cout << "Enter a number: ";
cin >> num;
while (num > 0)
{
result = result * num--;
}
cout << "Result is: " << result << endl;
return 0;
}
#include <iostream>
using namespace std;
int main()
{
int num, result =1;
cout << "Enter a number: ";
cin >> num;
while (num > 0)
{
result = result * num--;
}
cout << "Result is: " << result << endl;
return 0;
}
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So as mentioned from above...
This code:
while (num > 0)
{
result = result * num--;
}
could be written as (to get the same result)
while (num > 0)
{
result = result * num;
num--;
}
This code:
while (num > 0)
{
result = result * num--;
}
could be written as (to get the same result)
while (num > 0)
{
result = result * num;
num--;
}
If so, ravenpl might have given a bit too much info there :) Do you understand his explanation ? I would suggest going over the code yourself, and trying to understand what happens. The one important thing to realize is that a post-decrement uses the value first, and then decrements it.