C语言实现将人员信息写入磁盘文件并读出显示

//
// Created by 冲哥 on 2021/2/24.
// 关注公众号【C语言中文社区】，和更多C语言爱好者一块学习。
//

#include<stdio.h>
#include<process.h>

struct StuInfo {
    char name[20];
    char gender[2];
    int age;
} info[100];

void save_info(char *filename, int n) {
    FILE *fp;
    int i;
    if ((fp = fopen(filename, "wb")) == NULL) {
        printf("open file error!\n");
        exit(0);
    }
    for (int i = 0; i < n; i++) {
        if (fwrite(&info[i], sizeof(struct StuInfo), 1, fp) != 1) {
            printf("write error!\n");
        }
    }
    fclose(fp);
}

void show_info(char *filename, int n) {
    FILE *fp;
    if ((fp = fopen(filename, "rb")) == NULL) {
        printf("open file error!\n");
        exit(0);
    }
    for (int i = 0; i < n; i++) {
        fread(&info[i], sizeof(struct StuInfo), 1, fp);
        printf("%20s%10s%10d", info[i].name, info[i].gender, info[i].age);
    }
    fclose(fp);
}

int main(){
    int i, n;
    char filename[50];
    printf("how many info will be write?\n");
    scanf("%d", &n);
    printf("please input the filename:\n");
    scanf("%s", filename);
    printf("please input the name,gender,age:\n");
    for (int j = 0; j < n; j++) {
        printf("NO%d\n", j+1);
        scanf("%s,%s,%d", info[j].name, info[j].gender, info[j].age);
        save_info(filename, n);
    }
    show_info(filename, n);
    return 0;
}