《C语言程序设计》实验指导书答案(9)

FILE *fp;

if((fp=fopen(\ {

printf(\ exit(0); }

for(i=0;i

fwrite(&s[i],sizeof(struct student),1,fp);//写入文件后看是乱码 fclose(fp);*/

FILE *fp1;//把写入文件的数据再次读出来 if((fp1=fopen(\ {

printf(\ exit(0); }

for(i=0;i

fread(&s[i],sizeof(struct student),1,fp1); for(i=0;i

printf(\ fclose(fp1);

system(\}

3. //用定义结构类型的方法，编写程序建立一个具有学生学号、姓名、总分和联系电话的记录文件。

#include #include #define m 10 struct student{ long no;

char name[10]; int score;

long telephone; };

main() {

int i,n;

struct student s[m]; printf(\ scanf(\ for(i=0;i

printf(\ scanf(\

printf(\ scanf(\

printf(\ scanf(\ printf(\ scanf(\ }

for(i=0;i

printf(\ FILE *fp;

if((fp=fopen(\ {

printf(\ exit(0); }

for(i=0;i

fwrite(&s[i],sizeof(struct student),1,fp);//写入文件后看是乱码 fclose(fp);

system(\}

4. //编写程序，利用第3题建立的记录文件，从键盘上输入一个学号，可以查寻到此人其他信息。

#include #include #define m 10 struct student{ long no;

char name[10]; int score;

long telephone; };

main() {

int i,n;

struct student s[m]; printf(\ scanf(\/* for(i=0;i

printf(\ scanf(\ printf(\

scanf(\ printf(\ scanf(\

printf(\ scanf(\ }

for(i=0;i

printf(\ FILE *fp;

if((fp=fopen(\ {

printf(\ exit(0); }

for(i=0;i

fwrite(&s[i],sizeof(struct student),1,fp);//写入文件后看是乱码 fclose(fp);*/

FILE *fp1;//把写入文件的数据再次读出来 if((fp1=fopen(\ {

printf(\ exit(0); }

for(i=0;i

fread(&s[i],sizeof(struct student),1,fp1); int no;

printf(\ scanf(\ for(i=0;i

if(s[i].no==no)

printf(\ }

fclose(fp1);

system(\}

5. //编写程序，将第四题建立的文件复制一份。 #include #include #define m 10 struct student{ long no;

char name[10]; int score;

long telephone; };

main() {

int i,n;

struct student s[m]; printf(\ scanf(\/* for(i=0;i

printf(\ scanf(\ printf(\ scanf(\ printf(\ scanf(\

printf(\ scanf(\ }

for(i=0;i

printf(\ FILE *fp;//用于复制文件，即从原始文件中读出后再写入fp if((fp=fopen(\ {

printf(\ exit(0); }

// for(i=0;i

// fwrite(&s[i],sizeof(struct student),1,fp);//写入文件后看是乱码

FILE *fp1;//用于读出record.txt 文件。 if((fp1=fopen(\ {

printf(\ exit(0); }

for(i=0;i

{ fread(&s[i],sizeof(struct student),1,fp1); fwrite(&s[i],sizeof(struct student),1,fp); }

fclose(fp); fclose(fp1);

system(\}

6. //用产生随机数的方法产生：100个商场的序号（1到500之间）、每个商场一年四个季度每个季度的销售金额（单位万元），

//将这些数据存于数据文件，然后利用该文件求出每个商场一年的销售总金额。 #include #include #include struct market{ long no;

long quarter1; long quarter2; long quarter3; long quarter4; };

main() {

int i;

struct market m[101]; /*time_t t;

srand((unsigned) time(&t)); for (i=1; i<=100; i++) {

m[i].no=rand()P0;

m[i].quarter1=rand()0; m[i].quarter2=rand()0; m[i].quarter3=rand()0; m[i].quarter4=rand()0; }

FILE *fp;

if((fp=fopen(\ {

printf(\ exit(0); }

for(i=1;i<=100;i++)

fwrite(&m[i],sizeof(struct market),1,fp);//写入文件后看是乱码 fclose(fp);*/ FILE *fp1;

if((fp1=fopen(\

{

printf(\ exit(0); }

for (i=1; i<=100; i++) {

fread(&m[i],sizeof(struct market),1,fp1);

printf(\万)\\n\r2,m[i].quarter3,m[i].quarter4,(m[i].quarter1+m[i].quarter2+m[i].quarter3+m[i].quarter4)/4.0); }

system(\}