若有以下程序： #include ＜stdio.h＞ main( ) { FILE *fp; int i, a[6]={1,2,3,4,5,6},k; fp=fopen("data.dat","w+b"); for(i=0;i＜6;i++) {fseek(fp,0L,0); fwrite(&a[5-i],sizeof(int),1,fp); } rewind(fp); fread(&k, sizeof(int),1,fp); fclose(fp); printf("%d",k); } 则程序的输出结果是______。
A: 6
B: 1
C: 123456
D: 21
A: 6
B: 1
C: 123456
D: 21
举一反三
- 有以下程序： #include ＜stdio.h＞ main() { FILE*fp; int i,a[6] = {1,2,3,4,5,6},k; fp = fopen("data.dat", "w+b"); fwrite(&a[0],sizeof(int),1,fp); for(i=1; i＜6; i++) { fseek(fp, 0L, 0); fread(&k, sizeof(int), 1, fp); fseek(fp, 0L, 0); a[i] +=k; fwrite(&a[i], sizeof(int), 1, fp); } rewind(fp); fread(&k, sizeof(int), 1, fp); fclose(fp); printf("%d\n",k); } 程序的运行结果是______。[/i][/i] A: 21 B: 6 C: 123456 D: 11
- 有以下程序#include "stdio.h"main(){ FILE *fp; int i, a[6] = {1,2,3,4,5,6}, k; fp = fopen("data.dat", "w+b"); fwrite(&a[0], sizeof(int), 1, fp); for (i=1; i<6; i++) { fseek(fp, 0L, 0); fwrite(&a[i], sizeof(int), 1, fp); } fseek(fp, 0L, 0); fread(&k, sizeof(int), 1, fp); fclose(fp); printf("%d\n", k);}程序运行后的输出结果是______。[/i] A: 6 B: 21 C: 123456 D: 654321
- 有以下程序 #include “stdio.h”int main (void){FILE *fp; int i,a[6]={1,2,3,4,5,6k}; fp=fopen(“d3.dat”,"w+b"); fwrite(a,sizeof(int),6,fp); fseek(fp,sizeof(int)*3,SEEK_SET);/*该语句使读文件的位置指针从文件头向后移动3个int型数据*/ fread(a,sizeof(int),3,fp);fclose(fp); for(i=0;＜6;i++) printf("%d"a[i])；return 0;}程序运行结果是[/i] A: 4,5,6,4,5,6, B: 1,2,3,4,5,6, C: 4,5,6,1,2,3, D: 6,5,4,3,2,1,
- 以下程序运行后的输出结果是123456,请判断对和错 。#include <;stdio.h>;void main(){ FILE *fp; int x[6]={1,2,3,4,5,6},i;fp=fopen("test.dat","wb");fwrite(x,sizeof(int),3,fp);rewind(fp);fread(x,sizeof(int),3,fp);for(i=0;i<;6;i++)printf("%d",x[i]);printf("\n");fclose(fp);}[/i]
- 下列程序的输出结果是（ ） 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;}