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Factorial doesn't accept negative numbers 

Previously factorial could accept negative number which isn't defined
pull/1049/head
Kriyszig 2019-07-04 10:51:04 +05:30 committed by Alexander Medvednikov
parent ebbd63811d
commit 801e06318f
1 changed files with 4 additions and 1 deletions
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5
vlib/math/math.v
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@ -223,9 +223,12 @@ pub fn trunc(a f64) f64 {
// factorial calculates the factorial of the provided value. // factorial calculates the factorial of the provided value.
pub fn factorial(a int) i64 { pub fn factorial(a int) i64 {
if a < 0 {
panic('factorial: Cannot find factorial of negative number')
}
mut prod := 1 mut prod := 1
for i:= 0; i < a; i++ { for i:= 0; i < a; i++ {
prod = prod * (i+1) prod *= (i+1)
} }
return prod return prod
} }