Answer Posted / valli

//using recursion
fact(int);
main()
{
int n;
printf("enter n");
scanf("%d",n)
if(n<0)
printf("invalid number");
else
printf("factorial of %d =%d",n,fact(n));
}
fact(int n)
{
if(n==0||n==1)
return 1;
else
return n*fact(n-1);
}

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