题目内容
有以下程序#include “stdio.h”int main(void){FILE *fp; int k,n,a[6]={1,2,3,4,5,6};fp=fopen(“d2.dat”,”w”);fprintf(fp,”%d%d\n”,a[0],a[1],a[2]);fprintf(fp, “%d%d%d \n”,a[3],a[4],a[5]);fclose(fp);fp=fopen("d2.dat”,"r");fscanf(fp, "%d%d",&k,&n);printf("%d%d\n",k,n);fclose(fp);return 0;}程序的运行结果是
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有以下程序(提示:程序中fseek(fp,-2L*sizeof(int),SEEK_END;语句的作用是使位置指针从文件末尾向前移2*sizeof(int)字节)# include "stdio.h"int main(void){FILE*fp;int i,a[4]={1,2,3,4},b;fp=fopen("data.dat","wb");for(i=0;i<4;i++)fwrite(&a[i],sizeof(int),1,fp);fclose(fp);fp=fopen("data.dat","rb")；fseek(fp,-2L*sizeof(int),SEEK_END) ；fread(&b,sizeof(int),1,fp);/*从文件中读取sizeof(int)字节的数据到变量b中*/fclose(fp)；printf("%d\n",b) ；return 0;}执行后输出结果是
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有以下程序#include "stdio.h"int main(void){ FILE *fp; int i, k, n;fp=fopen("data.dat", "w+");for(i=1; i<6; i++){ fprintf(fp,"%d ",i);if(i%3==0) fprintf(fp,"\n");}rewind(fp);fscanf(fp, "%d%d", &k, &n);printf("%d %d\n", k, n);fclose(fp);return 0;}程序运行后的输出结果是
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