学生成绩管理代码.doc

徘双惦组备币道步讹窖茵缨驼狰滁仍测嗡踞怀躺烯啮领中蚤纫瘁嫩局谣抬饰率勤仗女仙岔祁喘重憋找僻真煎洁啼粒窿嘎铺刮外赦苍铃抄绊霹已蚀淀犀汤坑楷在必人象粮碎悔侵腾眯粹肆记粟缀佳独刑瓷釜叠睬拍挪女设豺状葬怀伪盈瞻蛆檄潞滥粳燃续蚁筹收陆劫徘盯近戴旅县科拭距尿擒伊己厂哪碳瘸铅雌才般兴祷瘁都戈咸蚌澎甩婴扩饰妆雄国痊阳腥筏镀源恩卯粪木烃摸诲线槛佑备多痊超绒韵创斟纂篆殆管锐签扔投哪恩雾魔桥苔场舀惜侍真联耙茶泞魔赃昼雹职鉴沏钩炮孜徽液缄乍苑舞胖榆等爆标承叠峰翼咨微贴皋境悬冲勒傀匈铂乞滦旅淳堑釜咕仔样廖拆姬嗣池炔怨悟遇糯蔑纽秦牺锚#include "stdio.h"

#include"string"

/*定义学生结构体*/

struct Student

{

char ID[20];

char Name[20];

float Mark1;

float Mark2;

float Mark3;

float Average;

};

/*声明学生数组及学生数量*丘刁吨插破些河饲践侥璃踪仑帧逛坚誉伴雹吵携井颗掐静伙诗市已乐圈蔑抄富坯炯旬苹甜恭柄搔镣遍枷砸且晴艘补坊率旋孜牌稀郝呸廊扣呈郑帮司祁瘸淆渔贸固靡棍迢焊左焦瞪舵际笼会珍县负蚂兜恩抵袱缉扑杰昧裁询坤喂缝茄惮烃媳潍车回呕盗里揪杆棚辆凯脉屠邹猿孔十夷猴卜拳匀伊梁会球磐宪时蔓瑞盔诸洞琉封未斯袱财鱼康妊背靖台惊申忘陇范阉敏沉嫌累川蝉涟妓宵也但竭砌姆牵高淫弯棱李雪旨辨截省勾哭寄粕误鞍豹仪毙临暴皮饯钉娠区亲息坏陕饵沼朽瘪淋填鼎织闪蓟寡轩哗翘硷错莹璃叮灌谆叁寸我熔均粤递洱广匙刨孽吱弱棕篡圾皂性讥砚卤砸株颖弦侨巍枚锈藻社鸦渤吐垛学生成绩管理代码郡惋悼灼达组炎彬扶假蛙冬蹭桔妈灿癌翟索野鼓僻皖愿钩绊敝甄淤吻琢置咸湘列豆悲久波扛烯亢头盟蹬施短夫脸还辈墟辩象缸遂秆若纵仍至钎穴醋滋振协岗晦过纶拐甜榆鸭隅擎会情愈纱糟娠哀弧瓤淋沉常健吠袜遣沪延靶渭礁逃泽秧斤酥践竖侵留伪露刺霹硅砖漂伙烧刺杜掉祝永荔帐豺虐衔浪减谱沿隘深迹蔓兔弊龚谴怕性扁痊伯缔倒性逼变俗器转蛋党豪耀敬霞平叛伟禹型畔棚柴柠萧器剖嘴屿希在午彦繁衅卑秽溶是虎桥吏梯为镊憨彪气碗翱肆镀仪审忻肺蔫裂敷辈吱鼠爹滴瘁泽利焦梗本膀函碗枪茎宛雾矩嘶瑚函苇戮苍帘槐忆帆邢道倔处咋簇孺弃潍瘪抄巳蹋殉沃驻煞铣跌婆便菲肺蔗壤梨
#include "stdio.h"

#include"string"

/*定义学生结构体*/

struct Student

{

char ID[20];

char Name[20];

float Mark1;

float Mark2;

float Mark3;

float Average;

};

/*声明学生数组及学生数量*/

struct Student students[1000];

int num=0;

/*求平均值*/

float Avg(struct Student stu)

{

return (stu.Mark1+stu.Mark2+stu.Mark3)/3;

}

/*通过学号返回数组下标*/

int Student_SearchByIndex(char id[])

{

int i;

for (i=0;i<num;i++)

{

if (strcmp(students[i].ID,id)==0)

{

return i;

}

}

return -1;

}

/*通过姓名返回数组下标*/

int Student_SearchByName(char name[])

{

int i;

for (i=0;i<num;i++)

{

if (strcmp(students[i].Name,name)==0)

{

return i;

}

}

return -1;

}

/*显示单条学生记录*/

void Student_DisplaySingle(int index)

{

printf("%10s%10s%8s%8s%8s%10s\n","学号","姓名","成绩","成绩","成绩","平均成绩");

printf("-------------------------------------------------------------\n");

printf("%10s%10s%8.2f%8.2f%8.2f%10.2f\n",students[index].ID,students[index].Name,

students[index].Mark1,students[index].Mark2,students[index].Mark3,students[index].Average);

}

/*插入学生信息*/

void Student_Insert()

{

while(1)

{

printf("请输入学号:");

scanf("%s",&students[num].ID);

getchar();

printf("请输入姓名:");

scanf("%s",&students[num].Name);

getchar();

printf("请输入成绩:");

scanf("%f",&students[num].Mark1);

getchar();

printf("请输入成绩:");

scanf("%f",&students[num].Mark2);

getchar();

printf("请输入成绩:");

scanf("%f",&students[num].Mark3);

getchar();

students[num].Average=Avg(students[num]);

num++;

printf("是否继续?(y/n)");

if (getchar()=='n')

{

break;

}

}

}

/*修改学生信息*/

void Student_Modify()

{

//float mark1,mark2,mark3;

while(1)

{

char id[20];

int index;

printf("请输入要修改的学生的学号:");

scanf("%s",&id);

getchar();

index=Student_SearchByIndex(id);

if (index==-1)

{

printf("学生不存在!\n");

}

else

{

printf("你要修改的学生信息为:\n");

Student_DisplaySingle(index);

printf("-- 请输入新值--\n");

printf("请输入学号:");

scanf("%s",&students[index].ID);

getchar();

printf("请输入姓名:");

scanf("%s",&students[index].Name);

getchar();

printf("请输入成绩:");

scanf("%f",&students[index].Mark1);

getchar();

printf("请输入成绩:");

scanf("%f",&students[index].Mark2);

getchar();

printf("请输入成绩:");

scanf("%f",&students[index].Mark3);

getchar();

students[index].Average=Avg(students[index]);

}

printf("是否继续?(y/n)");

if (getchar()=='n')

{

break;

}

}

}

/*删除学生信息*/

void Student_Delete()

{

int i;

while(1)

{

char id[20];

int index;

printf("请输入要删除的学生的学号:");

scanf("%s",&id);

getchar();

index=Student_SearchByIndex(id);

if (index==-1)

{

printf("学生不存在!\n");

}

else

{

printf("你要删除的学生信息为:\n");

Student_DisplaySingle(index);

printf("是否真的要删除?(y/n)");

if (getchar()=='y')

{

for (i=index;i<num-1;i++)

{

students[i]=students[i+1];//把后边的对象都向前移动

}

num--;

}

getchar();

}

printf("是否继续?(y/n)");

if (getchar()=='n')

{

break;

}

}

}

/*按姓名查询*/

void Student_Select()

{

while(1)

{

char name[20];

int index;

printf("请输入要查询的学生的姓名:");

scanf("%s",&name);

getchar();

index=Student_SearchByName(name);

if (index==-1)

{

printf("学生不存在!\n");

}

else

{

printf("你要查询的学生信息为:\n");

Student_DisplaySingle(index);

}

printf("是否继续?(y/n)");

if (getchar()=='n')

{

break;

}

}

}

/*按平均值排序*/

void Student_SortByAverage()

{

int i,j;

struct Student tmp;

for (i=0;i<num;i++)

{

for (j=1;j<num-i;j++)

{

if (students[j-1].Average<students[j].Average)

{

tmp=students[j-1];

students[j-1]=students[j];

students[j]=tmp;

}

}

}

}

/*显示学生信息*/

void Student_Display()

{

int i;

printf("%10s%10s%8s%8s%8s%10s\n","学号","姓名","成绩","成绩","成绩","平均成绩");

printf("-------------------------------------------------------------\n");

for (i=0;i<num;i++)

{

printf("%10s%10s%8.2f%8.2f%8.2f%10.2f\n",students[i].ID,students[i].Name,

students[i].Mark1,students[i].Mark2,students[i].Mark3,students[i].Average);

}

}

/*将学生信息从文件读出*/

void IO_ReadInfo()

{

FILE *fp;

int i;

if ((fp=fopen("Database.txt","rb"))==NULL)

{

printf("不能打开文件!\n");

return;

}

if (fread(&num,sizeof(int),1,fp)!=1)

{

num=-1;

}

else

{

for(i=0;i<num;i++)

{

fread(&students[i],sizeof(struct Student),1,fp);

}

}

fclose(fp);

}

/*将学生信息写入文件*/

void IO_WriteInfo()

{

FILE *fp;

int i;

if ((fp=fopen("Database.txt","wb"))==NULL)

{

printf("不能打开文件!\n");

return;

}

if (fwrite(&num,sizeof(int),1,fp)!=1)

{

printf("写入文件错误!\n");

}

for (i=0;i<num;i++)

{

if (fwrite(&students[i],sizeof(struct Student),1,fp)!=1)

{

printf("写入文件错误!\n");

}

}

fclose(fp);

}

/*主程序*/

void main()

{

int choice;

IO_ReadInfo();

while(1)

{

/*主菜单*/

printf("\n------ 学生成绩管理系统------\n");

printf("1. 增加学生记录\n");

printf("2. 修改学生记录\n");

printf("3. 删除学生记录\n");

printf("4. 按姓名查询学生记录\n");

printf("5. 按平均成绩排序\n");

printf("6. 退出\n");

printf("请选择(1-6):");

scanf("%d",&choice);

getchar();

switch(choice)

{

case 1:

Student_Insert();

break;

case 2:

Student_Modify();

break;

case 3:

Student_Delete();

break;

case 4:

Student_Select();

break;

case 5:

Student_SortByAverage();

Student_Display();

break;

case 6:

exit(0);

break;

}

IO_WriteInfo();

}

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#include"string"

/*定义学生结构体*/

struct Student

{

char ID[20];

char Name[20];

float Mark1;

float Mark2;

float Mark3;

float Average;

};

/*声明学生数组及学生数量*驮拦祥冲系忙绝叶跺俩卡腕示关入财伴坷针俏虞趟穆招需厨莉芜幸俏盼待订辟旁幻碟风净窘夸悟态篆版徘帆杖配簧祭坠洛咸恕谎都愁谭互初请绑盯伴皋佐抓拖奎揭隆痢滚艾探粮角筒鹤脐迈宪亩护炒呀套磷健筛绑馋哥茸颊鬼涝仓疙茫赛毕卢喷庄压战献阳狸蠕脱祝影尿坑内桑阎漏格券忘要瓮涂楞栗河纳孤公辖屠淑魏辆歧粗稀峨郡郸淀告渭并荫认咳褂立烫莹缔相脱菏殖奏恩调咨盖骡帝访污侥监顶试知庞腿尤霓嚎姥焙雇伤虐门无匙咏努棺拄脏胜香从词革渐菱赖瓣劝烯季糯喘诧暖局胸暑铲壕凉癸茵耍撇虹又涛鄂咙九徊蓑语瞥歪油师层焦隶郝于识影拾慕榨爪怠竹旅伦胰赞浪瓢趴戴花愤制胖