0

```
int ans, guess, random, type, counter, num, i;
char option[20], numb[10], input[5];
int power(int num)
{
ans=2;
if(num==0)
{
return(1);
}
if(num<0)
{
printf("incorrect input, please input a positive integer:");
return(0);
}
else
for(i=1; i!=num; i++)
{
return(ans=ans*2);
}
return(0);
}
int main()
{
/*before this there is all the switch case stuff*/
case 1 :
/*powers of 2 calculator*/
printf("please enter a positive integer:\n");
fgets(numb, sizeof(numb), stdin);
sscanf(numb, "%d",&num);
printf("the answer is:%d\n",power(num));
break;
ok so the origional was:
case 1 :
/*powers of 2 calculator*/
printf("please enter a positive integer:\n");
fgets(numb, sizeof(numb), stdin);
sscanf(numb, "%d", &num);
ans=2;
if(num<0)
printf("incorrect input, please input a positive integer:");
if(num==0)
printf("the answer is 1\n");
for(i=1; i!=num; i++)
ans=ans*2;
printf("The answer is %d\n", ans);
break;
```

and i had to take that and turn it into a recursive function. IDK what recursion is other than "it calls itself" or something... anyway im lost on this.

please help!