题目内容

有如下程序#include "stdio.h"int main(void){FILE *fp1;fp1=fopen("f1.txt","w");fprintf(fp1,"abc");fclose(fp1);return 0;}若文本文件f1.txt中原有内容为:good,则运行以上程序后文件f1.txt中的内容为

A. goodabc
B. abcd
C. abc
D. abcgood

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有以下程序#include "stdio.h"void WriteStr(char fn,char str){ FILE *fp;fp=fopen(fn,"w");fputs(str,fp);fclose(fp);}int main(void){WriteStr("t1.dat","start");WriteStr("t1.dat","end");return 0;}程序运行后,文件t1.dat中的内容是_____。

A. start
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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

A. 0 0
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C. 1 4
D. 1 2

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A. 1 2
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若调用fputc函数输出字符成功,则其返回值是

A. EOF
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C. 0
D. 输出的字符