向磁盘文件18-1.txt中输入一行字符。
#include "stdio.h"
#include "stdlib.h"
main()
{【1】 *fp;
char ch;
if((fp=fopen("18-1.txt","w"))==NULL)
{ printf("Cannot open．
");
exit(0);
}
while((ch=getchar())!='
')
fputc( 【2】 ,fp);
【3】 ;
}
#include "stdio.h"
#include "stdlib.h"
main()
{【1】 *fp;
char ch;
if((fp=fopen("18-1.txt","w"))==NULL)
{ printf("Cannot open．
");
exit(0);
}
while((ch=getchar())!='
')
fputc( 【2】 ,fp);
【3】 ;
}
举一反三
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- 下面程序的输出结果是________。#include<;stdio.h>;int main( ){ FILE *fp; int n,a[2]={65,66}; char ch; fp=fopen("d.dat","w"); fprintf(fp,"%d%d",a[0],a[1]); fclose(fp); fp=fopen("d.dat","r"); fscanf(fp,"%c",&ch); n=ch; while(n!=0){printf("%d",n%10);n=n/10;} fclose(fp); return 0;}
- 执行以下程序后，test.txt文件的内容是(若文件能正常打开) ( )。#include ＜stdio.h＞#include ＜stdlib.h＞main( ) FILE * fp; char * s1 = "Fortran" , * s2 = "Basic"; if((fp = fopen( "test. txt" ," wb" )) = = NULL) prinff( "Can’t open test. txt file \n"); exit(1); fwrite( s1 ,7,1 ,fp); /* 把从地址s1开始到7个字符写到fp所指文件中*/ fseek(fp,OL,SEEK_SET); /*文件位置指针移到文件开头*/ fwrite (s2,5,1,fp); felose (fp); A: Basiean B: BasieFortran C: Basic D: FortranBasie