程序代码：

#include <stdio.h>
#include <string.h>
char *a[5][2]=
{
    "11_c", "12_c", "13_c", "14_c", "15_c",
    "16_c", "17_c", "18_c", "19_c", "20_c",
};
void save(void)
{
    FILE *fp=NULL;
    int i, ret_code;
    ret_code = fopen_s(&fp, "d:\\arr.dat", "w");

    if (0 != ret_code)
    {
        printf ("\t打开文件失败!\n");
        return;
    }
    for (i=0; i<5; ++i)
    {
        fwrite(a[i][0], strlen(a[i][0]), 1, fp);
        fwrite(a[i][1], strlen(a[i][1]), 1, fp);
    }
    fclose(fp);
}
int print(void)
{
    FILE *fp=NULL;
    int ret_code;
    ret_code = fopen_s(&fp, "d:\\arr.dat", "r");
    if (0 != ret_code)
    {
        printf ("\t打开文件失败!\n");
        return -1;
    }

    while (0 == feof(fp))
    {
        printf("%c", fgetc(fp));
    }
    fclose(fp);
    printf("\n");
    return 0;//success
}
int main(void)
{
    save();
    print();
    return 0;
}