题目内容

以下程序执行后，文件dataf.txt的内容是（）。int main(){ FILE *fp;int a=15,b=18;fp=fopen("dataf.txt","w");fprintf(fp,"%d ",a);fclose(fp);fp=fopen("dataf.txt","a");fprintf(fp,"%d ",b);fclose(fp);return 0;}

A. 15
B. 15 18
C. 18
D. 18 15

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执行以下程序的输出结果是（）。int main(){FILE fp;int a=15,b,c;a+=5;fp=fopen("dataf.txt","w");fprintf(fp,"%d ",a);fclose(fp);fp=fopen("dataf.txt","r");fscanf(fp,"%d ",&b);fclose(fp);c=ab;printf("%d\n",c);}

A. 300
B. 400
C. 15
D. 20

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A. 170.5
B. 102,68.5
C. 102
D. 68.5

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A. world
B. hello
C. hello world
D. world hello

以下程序运行后，data.txt文件中的内容是（）。#include int main(){ FILE *fp;char str[]="GoodNight!";int i=0;fp=fopen("d:\\data.txt","w");while(i<4){ fprintf(fp,"%c",str[i]);i++;}fclose(fp);return 0;}

A. Night
B. GoodNight!
C. GoodN
D. Good