程序在打印最后一行之前退出

Question

程序在返回值0之前打印最后一行之前完成，它不打印我用/* ** */标记的那些：

int main()
{
        int num,sum=0,num1;
        printf("Enter size of input:\n");
        scanf("%d",&num);

        int *arr=(int*)malloc(sizeof(int)*num);
        printf("Enter numbers:\n");
        for(int i=0;i<num;i++)
        {
            if(scanf("%d", &num1))
            {
                arr[i]=num1;
                sum+=powerOfTwo(num1);
            }
            else
            {
                printf("Invalid number");  /* ** */
                free(arr);
                printf("\n");
                return 0;
            }
        }

        for(int i=0;i<num;i++)
        {
            printf("The number %d is a power of 2: %d = 2^%d\n", arr[i], arr[i], powerOfTwo(arr[i]));
        }
        printf("Total exponent sum is %d\n",sum); /* ** */

        free(arr);
        return 0;
}