c语言【const】用法

 1 #include<stdio.h>
 2 #define SIZE 5
 3 void show_arry(const double ar[], int n);
 4 void mult_array(double ar[], int n, double mult);
 5 int main(void)
 6 {
 7     double dip[SIZE] = { 20.0,3.2,5.3,63.0,6.3 };
 8 
 9     printf("the original dip array:\n");
10     show_arry(dip, SIZE);
11     mult_array(dip, SIZE, 5.0);
12     printf("the dip array after callling mult_array():\n");
13     show_arry(dip, SIZE);
14 
15     return 0;
16 }
17 
18 
19 void show_arry(const double ar[], int n)
20 {
21     int i;
22     for (i = 0; i < n; i++)
23         printf("%8.3f", ar[i]);
24     putchar(‘\n‘);
25 }
26 
27 void mult_array(double ar[], int n, double mult)
28 {
29     int i;
30     for (i = 0; i < n; i++)
31         ar[i] *= mult;
32 
33 }