How can I print this series 1 -6 120 -5040 when user input n=7.

Question

Read the value of an N and print the series , 1 -3 5 -7...N

int n, x=1;
For(int I=1;I<=n;I +=2)
{
Printf("%d",I*x);
x*=(-1);
}

But I'm not know how can I print this series

For N=7 output is the following series ,

1 -6 120 -5040

It's like Factorial Number.

Answer 1

Here's a factorial list from 1 ~ 7

# 1 2 3 4 5 6 7
F 1 2 6 24 120 720 5040

Notice that you need to skip printing factorial of even numbers, and invert negative sign on each printed factorial number.

Answer 2

Ayesha where is your attempt?

Answer 3

Is that 1 followed by -6 (negative six) then 120 followed by -5040 (negative 5040)

Or one to six, then 120 to 5040

Do they print on one line or separate line?

Please elaborate more by editing the post with additional details in post Description.

Answer 4

Hadn't you tried yet 🤔

Answer 5

Show your attempt

Answer 6

looks like you just need to take the factorial of each result from the first series, while still keeping the sign step until last, no? Should be a fairly straightforward nested loop situation once you've gotten this far, so what's the problem you're having?