1第12章作业上机题新教材p2591,4,5,6(老教材p3044,7,8,9)1.语句:#includeprintf("%d%d%d",NULL,'\0',EOF);将输出_______。A．001B．00-1C．NULL\0EOFD.10EOF3.若文件型指针fp中指向某文件的末尾，则函数feof(fp)的返回值是__________。A.0B.-1C.非零值D.NULL2.以读写方式打开一个已有的文本文件file1,并且FILE*fp,下面fopen函数正确的调用方式是________。A.fp=fopen("file1","r")B.fp=fopen("file1","r+")C.fp=fopen("file1","rb")D.fp=fopen("file1","w")24.假设文本文件a.txt中存放了下列数据：one?two?1234?output?文本文件b.txt中存放了下列数据：one?two?1204?output?下列程序的输出结果是_________________。#include#includevoidmain(){intcount;charch1,ch2;FILE*f1,*f2;If((f1=fopen(“a.txt”,”r”))==NULL){Printf(“Can’topenfile:%s\n”,”a.txt”);Exit(0);}If((f2=fopen(“b.txt”,”r”))==NULL){Printf(“Can’topenfile:%s\n”,”b.txt”);Exit(0);}count=0;while(!feof(f1)||!foef(f2)){ch1=fgetc(f1);ch2=fgetc(f2);if(ch1!=ch2){printf(“%c#%c#”,ch1,ch2);printf(“%d#”,count);break;}if(ch1==’?’)count++;}fclose(f1);fclose(f2);}3设文件file1.txt中以如下格式存放一批学生的姓名及成绩:Tom80Jerry90姓名与成绩之间用至少一个空格分隔并且每个学生的姓名中不含空格.现通过编程读取file1.txt中的资料,找出其中成绩最高的那位学生(假定最高分唯一),并把该生的资料写入file2.txt中.fscanf(fp1,"%s%d",max.name,&max.score);while(){;if(a.score>max.score){;max.score=a.score;}}fprintf(fp2,“%s%d\n”,max.name,max.score);fclose(fp1);fclose(fp2);}#include#includetypedefstructstudent{charname[10];intscore;}ST;voidmain(){FILE*fp1,*fp2;STa,max;fp1=fopen("file1.txt","r");fp2=fopen("file2.txt","w");if(){put("Cannotopenfile!");exit(0);}
