exp10_03.c

《C语言程序设计教程、实验与练习》 源文件下载

#include <stdio.h>

void main()
{
 int a;
 FILE *fp1,*fp2;

 fp1=fopen("integer.dat","wb");
 if(fp1==NULL)
 {
   printf("can't create integer.dat\n");
   return;
   }

 for(a=1;a<=100;a++)
   fwrite(&a,sizeof(int),1,fp1);
 fclose(fp1);

 fp2=fopen("integer.dat","rb");
 fseek(fp2,49*sizeof(int),SEEK_SET);
 fread(&a,sizeof(int),1,fp2);
 fclose(fp2);

 printf("the 50th data is %d\n",a);
 }