Adding one to every digit of number

Hi there,
I' m encountering the following warning:
Warning W8004 sum1num.c 7: 'd' is assigned a value that is never used in function main.
How can I remove it in this case and what should I do in case of any other code having this warning?? Also, is there any way to shorten this code and is my indentation right?
Here's the

Code:

---

#include <stdio.h>
#include <math.h>
/*Adding one to every digit of number*/
float main ()
{
int a,  c = 0, e = 0, n, p, x;
float d = 0, b;
printf("Enter a number\n");
scanf("%d", &n);
p = n;
while (n != 0)
  {
  n = n/10;
  c++ ;
  }
for (b = 0; b<c; b++)
  {
  d = exp(b*log(10));
  e = e + d;
  }
x = p + e;
  printf("The new number is = %d\n", x);
return 0;
}

---

use

Code:

---

float d, b;

---

Thanks!
a minor mistake :eek:

You can also get rid of d completely if you wanted and change this loop:

Code:

---

for (b = 0; b<c; b++)
{
    d = exp(b*log(10));
    e = e + d;
}

---

To this:

Code:

---

for (b = 0; b<c; b++)
{
    e += exp(b*log(10));
}

---

You also don't really need the variable x (or a for that matter), you can just print p+e in the printf directly.

It also seems that b, given how it is used, should be an int, not a float.

This needs to be changed:

Code:

---

float main ()

---

You can also get rid of the need for the "number of digits" calculation for-loop (and therefore for the variable p as well) and use this instead to set the variable c.

Code:

---

c = floor(log10(n))+1;

---

p wouldn't be needed anymore because you're not destroying the original n now and the last printf call can just be for n+e instead of p+e.