백준 2745 진법 변환

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

#define ZERO 48
#define A 65
#define SIZE 100

int main()
{
    /* Declare Variables */
    char NUMBER[SIZE];
    int number[SIZE];
    int base;
    int ans;
    size_t len;

    int i;
    int temp;

    /* Initialize Variables */
    memset(NUMBER,'\0',SIZE);
    ans = 0;

    /* Get Inputs */
    scanf("%s", &NUMBER);
    scanf("%d", &base);

    len = strlen(NUMBER);

    /* Convert character to integer */
    for (i = 0; i < len; i++)
    {
        if (NUMBER[i] >= ZERO && NUMBER[i] < A)
        {
            number[i] = (int)NUMBER[i] - ZERO;
        }
        else if (NUMBER[i] >= A)
        {
            number[i] = (int)NUMBER[i] - A + 10;
        }
    }

    /* Convert N base to decimal */
    for (i = 0; i < len; i++)
    {
        temp = number[len - i - 1] * pow(base, i);
        ans = ans + temp;
    }

    /* Print output */
    printf("%d\n", ans);
    
}