C++ Programming Tutorial 37 - For Loops (How to Calculate Factorial)

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[ReddoX]

I did the factorial code counting up, here is how it looks:




#include <iostream>

int main()
{
int number = 4;
int result = 1;
for(int i = 1; i <= number; i++){
result = result * i;
}
std::cout << "Factorial of " << number << " is: " << result << "\n";
}

[michaelswagson]

If you are running an infinte loop, you can slow it down by including the stdlib.h header and by putting _sleep(milliseconds) into the loop.

[yasina]

Mr. Caleb is the best teacher. Your teaching way so easy.
I can't thank you enough
Watching from Ethiopia

[patrickconrad]

I feel like I should get this but why use int i = factorial - 1 in this instance? Why not just use factorial? Isn't it 5 × 4 × 3 ×2 ×1? So starting at four and going to i>0 would still give you would only go to 1 right?

[solidstatedrive.]

note: this factorial program can only calculate the factorial of values up to 65 with an unsigned long long datatype

[bryced]

for some reason it works fine for me, then when changed to user input it breaks and outputs: "the factorial of 5 is 0"

int main()
{
int num;
int factorial = num;
std::cout << "Enter a integer to factorial: ";
std::cin >> num;

for(int i = factorial - 1; i > 1; i--)
{
factorial = factorial * i;
}
std::cout << "the factorial of " << num << " is " << factorial;

return 0;
}

[togurosensei]

curious isnt i equal 4 cuz 5 minus 1 is 4 so 4 x 3 x 2 is 24

[aronwouters]

If you're still looking for a replacement for the loop:

int factorial(int number)
{
if (number < 2)
return number;

return number * factorial(number - 1);
}

[twotoes]

the colon in between the quotation marks?

[odelolatechup]

Please can someone help with this:

Write a program in c++ that requests for n, number of students , read their ages and determine their average ages .

Note: Using for loop control structure

Have written this code well but am wondering why I keep getting errors.
Please kindly assist me, it's urgent. Thanks in advance

[tebeckcollins]

Hey dude this is so simple
Why are u wasting my time 😂