2998 8진수

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
 
char arr[105] = { 0 };
 
int* toOctat(char* arr, int len, int octL) {    
    int* rst = (int*)calloc(octL, sizeof(int));
    int octIdx = octL - 1;
 
    for (int i = len - 1; i >= 0; ) {
        int tmp = 0;
        for (int j = 0; j < 3; j++) {
            tmp += ((int)(arr[i]) - 48) * pow(2, j);
            i--;
 
            if (i < 0) break;
        }
        rst[octIdx] = tmp;
        octIdx--;
    }
    return rst;
}
 
int main() {
    scanf("%s", &arr);
 
    int len = strlen(arr);
    int octL = len / 3;
    if (len % 3 != 0)
        octL++;
    
    int* oct = toOctat(arr, len, octL);
 
    for (int i = 0; i < octL; i++) {
        printf("%d", oct[i]);
    }
}