c第七次作业

1.#include

#include

void main()

{

char filename[80];

char ch;

FILE *fp;

printf("输入完整文件名:"); scanf("%s",filename);

if((fp=fopen(filename,"r"))==NULL) {

printf("文件打开失败");

exit(0);

}

while((ch=fgetc(fp))!=EOF)

{

printf("%c(%d)",ch,(int)ch);

}

fclose(fp);

printf("\n");

}

2# include

# define SIZE 5

# include structstudent_type

{

char name[20];

intnum;

intchengji[3];

floatavg;

}stud[SIZE];

void main()

{

FILE *p1,*p2;

inti,j,sum=0,n,m;

for(i=0;i

{

sum =0; //添加

printf("请按格式输入stud[%d]的名字学号成绩1 成绩2 成绩3\n" ,i); //修改处

scanf("%s",stud[i].name);

scanf("%d",&stud[i].num);

for(j=0;j<3;j++)

{

scanf("%d",&stud[i].chengji[j]); //修改处

sum+=stud[i].chengji[j];

}

stud[i].avg=(float)sum/3; //修改

}

if((p1=fopen("d:\\stud_list.txt","w+"))==NULL)//（将上面的数装入p1中）

{

printf("cannot open the file\n");

exit(0);

}

for(i=0;i

{

if(fwrite(&stud[i],sizeof(structstudent_type),1,p1)!=1)

printf("file write error\n");

}

fclose(p1);

if((p1=fopen("d:\\stud_list.txt","rb"))==NULL)//添加（将上面的数装入p1中）

{

printf("cannot open the file\n");

exit(0);

}

printf("wen jian de neirongshi :\n");

for(i=0;fread(&stud[i],sizeof(structstudent_type),1,p1)!=0;i++)//（读出p1中的数并在屏幕上打印出来)

{

printf("\n%s",stud[i].name);

printf("%10d",stud[i].num);

for(j=0;j<3;j++)

printf("%4d ",stud[i].chengji[j]); //修改

printf("%10.2f",stud[i].avg);

}

printf("\n"); //添加

fclose(p1);

n=i;

student_type change; //修改

change =stud[0]; //修改

for(i=0;i

for(j=i+1;j

if(stud[i].avg

{

change=stud[i];

stud[i]=stud[j];

stud[j]=change;

}

printf("\nshuchupaixuhou :");

if((p2=fopen("d:\\stud.txt","w+"))==NULL)//（将排序好了的数装入在p2中）{

printf("cannot open the file:\n");

exit(0);

}

for(i=0;i

{

fwrite(&stud[i],sizeof(structstudent_type),1,p2);

printf("\n%s",stud[i].name);

printf("%10d",stud[i].num);//添加

for(j=0;j<3;j++)

printf("%4d",stud[i].chengji[j]);

printf("%10.2f",stud[i].avg);

}

fclose(p2);

printf("\n");

student_type find; //修改

while(1)//（打印出你要找的人的全部信息）

{

if((p2=fopen("d:\\stud.txt","rb"))==NULL)//（将排序好了的数装入在p2中）{

printf("cannot open the file:\n");

exit(0);

}

printf("print the num you want to found:\n");//（输入你要查找的人的学号）scanf("%d",&m);

while(!feof(p2))

{

fread(&find,sizeof(structstudent_type),1,p2);

if(find.num==m)

{

printf("%s %10d",https://www.360docs.net/doc/5e12547186.html,,find.num);

for(i=0;i<3;i++)

printf("%5d",find.chengji[i]);

printf("%10.3f",find.avg);

printf("\n");

break;

}

}

if(feof(p2))

printf("input wrong num, please input again\n");

fclose(p2);

}

}