/*-----------------------------------------

     mems.c -- 使用 memcpy() 和 memmove()

 -----------------------------------------*/

 #include <stdio.h>

 #include <string.h>

 #include <stdlib.h>

 #define SIZE 10

 void show_array(const int ar[], int n);

 int main()

 {

     int values[SIZE] = {, , , , , , , , , };

     int target[SIZE];

     double curious[SIZE / ] = {2.0, 2.0e5, 2.0e10, 2.0e20, 2.0e30};

     puts("memcpy() used:");

     fputs("values (original data):\n", stdout);        //等同于 puts("values (original data):");

     show_array(values, SIZE);

     memcpy(target, values, SIZE * sizeof(int));

     puts("target (copy of values):");

     show_array(target, SIZE);

     puts("\nUsing memmove() with overlapping ranges:");

     memmove(values + , values, (SIZE / ) * sizeof(int));

     puts("values -- elements 0-4 copied to 2-6:");

     show_array(values, SIZE);

     puts("\nUsing memcpy() to copy double to int:");

     memcpy(target, curious, (SIZE / ) * sizeof(double));

     puts("target -- 5 double into 10 int positions:");

     show_array(target, SIZE / );

     show_array(target + , SIZE / );

     return ;

 }

 void show_array(const int ar[], int n)

 {

     for (int index = ; index != n; ++index)

         printf("%d ", ar[index]);

     fputc('\n', stdout);

 }