程序代码：

#include <stdio.h>
int main(void)
{
    struct person
    {
        char name[20];
        char sex;
        int age;
        float height;
    }person1;

    FILE *fp;
    int i;
    char fname[20];
    printf("please input file name:\n");
    scanf("%s",fname);
    printf("please input three person's name,sex,age and height:\n");

    if ((fp = fopen(fname,"wb")) == NULL)
    {
        printf("cannot open this file!\n");
        return 0;
    }

    for (i=1 ;i<4 ;i++)
    {
        scanf("%s %c%d%f",person1.name,&person1.sex,&person1.age,&person1.height);
        if ((fwrite(&person1, sizeof(person1), 1, fp)) != 1)
        {
            printf("write error!\n");
            return 0;
        }
    }

    fclose(fp);

    printf("the content of the file is:\nNAME\t\tsex\tage\theight\n");

    if ((fp = fopen(fname,"wb")) == NULL)
    {
        printf("cannot open this file!\n");
        return 0;
    }

    for (i=1; i<4; i++)
    {
        if ((fread(&person1, sizeof(person1), 1, fp)) == 1)
        {
            printf("%-16s%-8c%-8d%-10.2f",person1.name,person1.sex,person1.age,person1.height);
        }

    }

    fclose(fp);

    return 0;
}