在C程序中使用malloc()和free()而不获取(lldb)

Question

这是我使用malloc()和free()编写的第一个程序。在我看来是正确的，当我参考我的书时，它看起来和书中的例子非常相似。然而，当我运行程序时，我得到一个(lldb)提示。

输入的元素数为8，初始化值为2。我的xcode编译器返回"(lldb)"

有谁能给我指个方向吗?

#include <stdio.h>
#include <stdlib.h>
int * make_array(int elem, int val);
void show_array(const int ar[], int n);
int main(void)
{
int *pa;
int size;
int value;
printf("Enter the number of elements: ");
scanf("%d", &size);
while (size > 0) {
    printf("Enter the initialization value: ");
    scanf("%d", &value);
    pa = make_array(size, value);
    if (pa)
    {
        show_array(pa, size);
        free (pa);
    }
    printf("Enter the number of elements (<1 to quit): ");
    scanf("%d", &size);
}
printf("Done.n");
return 0;
}
int * make_array(int elem, int val)
{
int index;
int * ptd;
ptd = (int *) malloc(elem * sizeof (int));
for (index = 0; index < elem; index++)
    ptd[index] = val;
return ptd;
}
void show_array(const int ar[], int size)
{
int i;
for (i = 0; i < size; i++)
    printf("%d",ar[i]);
}

Answer 1

程序编译并运行(可能如您所料)。下面是示例输出:

Enter the number of elements: 5
Enter the initialization value: 12
1212121212
Enter the number of elements (<1 to quit): 8
Enter the initialization value: 2
22222222
Enter the number of elements (<1 to quit): 100
Enter the initialization value: 34
34343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434343434
Enter the number of elements (<1 to quit): -1
Done.