Giving zeroes on higher values like 500, 400 what is the reason?, I also tried long lon int still giving the same error

#1
#2

Hey @nikhilthechamp871 you must be passing a single test case and failing rest. Reason for that is you will be having value of N in range of 1 to 500,
factorial of 100 is

100 !  = 93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000

No data type can store this much value as the logic you are using, won’t be applicable in solving this problem. So you have to think differently in this problem.
Think somewhat in this direction

A number 5189 is stored in res[] as following.
res[] = {9, 8, 1, 5}
x = 10

Initialize carry = 0;

i = 0, prod = res[0]*x + carry = 9*10 + 0 = 90.
res[0] = 0, carry = 9

i = 1, prod = res[1]*x + carry = 8*10 + 9 = 89
res[1] = 9, carry = 8

i = 2, prod = res[2]*x + carry = 1*10 + 8 = 18
res[2] = 8, carry = 1

i = 3, prod = res[3]*x + carry = 5*10 + 1 = 51
res[3] = 1, carry = 5

res[4] = carry = 5

res[] = {0, 9, 8, 1, 5}
#3

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