#include<stdio.h>

#include<malloc.h>

int main()

{

int n;

int val;

int * a;

int sun = 0, i;

printf("請輸入陣列的長度:");

scanf("%d", &n);

printf("\n");

a = (int *)malloc(n * sizeof(int));//為陣列a動態分配記憶體

for(i = 0; i < n; i++)

{

printf("請輸入陣列的第%d個元素的值:", i+1);

scanf("%d", &val);

printf("\n");

a[i] = val;

}

for (i = 0; i < n; i++)

{

sun+=a[i];//sun+=a[i]相當於sun=sun+a[i];

}

printf("sun = %d\n",sun);

free(a);//釋放a動態分配的記憶體

return 0;

}