What is wrong with my code(what should be there for negative exponents)[N.B.:you can't use power function.]

Question

#include<stdio.h>
#include<math.h>

int main()
{
int x,n;
float power=1,inv=1;
inv = 1 / x;
printf("x=");
scanf("%d",&x);
printf("n=");
scanf("%d",&n);
int i=0;
if(n>=0)
{
while(i<n)
{
power*=x;
i++;
}
printf("%d^%d=%.4f",x,n,power);
}
else
{
n=-n;
while(i<n)
{

power=power*inv;
i++;
}
printf("%d^%d=%.4f",x,n,power);
}
return 0;
}

Answer 1

Your most obvious problem is using x prior to reading it. You assign 1/x to inv and 2 lines later scanf into x. The value x has could be anything as it will use whatever was left in it's memory location. The only thing guarenteed is inv will almost never have the value you thought.