Ricerca Dicotomica

#include <stdio.h>
#include <malloc.h>

void order_arr(int* , int);
int search(int* , int , int );
void order_arr(int *arr , int len){
    int i, b = 0;
    for(i= 0;b<len;i++){
        if(arr[b] >= arr[i] && b == 0 ){
            int t = arr[b];
            arr[b] = arr[i];
            arr[i] = t;
        } else if(arr[b] <= arr[i] && b != 0){
            int t = arr[b];
            arr[b] = arr[i];
            arr[i] = t;
        }
        if(i == len-1){
            i = 0;
            b++;
        }
    }
}
int search(int *arr , int find , int len){
    int a = len - 1;
    int b = 0 , c = a , d;
    while( find != arr[c]){
        c = a/2 ;
        if(find > arr[c]){
            c =(int) a + (a/2);
            a =(int) c;
        } else if(find < arr[c]){
            c =(int) a - (a/2);
            a = (int) c;
        } else if(c == (len - 1)/a && find != arr[len-1]){
            return -1;
            break;
            }
        }
        return c + 1;
    }


main(){
    int len ;
    int i = 0;
    printf("Specificare il numero di dati: ");
    scanf("%d" , &len);
    int *arr = (int *) malloc(sizeof(int)* len );
    printf("Inserire i dati\n");
    while(i < len){
        scanf("%d" , &arr[i]);
        i++;
    }
    order_arr(arr , len);
    printf("Inserire l'intero da cercare: ");
    int find ;
    scanf("%d" , &find );
    int f = search(arr , find , len);
    if(f != 0){
    printf("\n%d" , f);
} else {
    printf("Numero non trovato");
}
}