# GO Program to Find Factorial of a Number

This program takes a positive integer from the user and computes factorial using for loop. New function factorial created which returns the factorial value of a number.

//Program to find Factorial of number package main import "fmt" /* Variable Declaration */ var factVal uint64 = 1 // uint64 is the set of all unsigned 64-bit integers. // Range: 0 through 18446744073709551615. var i int = 1 var n int /* function declaration */ func factorial(n int) uint64 { if(n < 0){ fmt.Print("Factorial of negative number doesn't exist.") }else{ for i:=1; i<=n; i++ { factVal *= uint64(i) // mismatched types int64 and int } } return factVal /* return from function*/ } func main(){ fmt.Print("Enter a positive integer between 0 - 50 : ") fmt.Scan(&n) fmt.Print("Factorial is: ",factorial(n)) }

In above program we have created a function "factorial" which returns a value of uint64.

factVal *= uint64(i) // i is int and factVal is uint64. Compiler will through exception "mismatched types int64 and int" if we not convert i to uint64.

factVal *= uint64(i) // i is int and factVal is uint64. Compiler will through exception "mismatched types int64 and int" if we not convert i to uint64.

2017-02-02T18:00:32+05:30
2017-02-02T18:00:32+05:30
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