从文件中读取的问题 [英] problem with reading from file
问题描述
我从文件中读取时遇到问题。我想在文件中找到一些
字符串（例如名字），如果存在，则在屏幕上显示
秒和第三行。
我有这个档案：
名字
姓氏
年龄
#include< stdio.h>
#include< conio.h>
文件*文件;
main（）{
char s [30];
int line = 0;
char name [] =" kate";
file = fopen（" text.txt"，" r"）;
if（！file） {
printf（文件不存在）;
getch（）;
返回0;
}
while（line< 4）
{
fgets（s，sizeof（s），file ）;
if（strcmp（s，name）== 0）printf（"％s"，s）;
else {
printf（没找到字符串）;
getch（）;
返回0;
}
line ++;
}
fclose（fi le）;
getch（）;
}
mi******@o2.pl 写道：我从文件中读取有问题。我想在文件中找到一些
字符串（例如名字），如果存在则在屏幕上显示第二和第三行的
。
我有这个文件：
姓名
姓氏
年龄
#include< stdio.h>
#include< conio.h>
FILE *文件;
main（）{
我会在这里指出你需要有int main（）你需要
返回一些东西。
你对这段代码有什么问题？
Andrew Poelstra写道：mi *** ***@o2.pl 写道：我从文件中读取有问题。我想在文件中找到一些
字符串（例如名字），如果存在则在屏幕上显示第二和第三行的
。
我有这个文件：
姓名
姓氏
年龄
#include< stdio.h>
#include< conio.h>
FILE *文件;
main（）{
我会在这里指出你需要int main（ ）你需要回复一些东西。
这段代码究竟是什么问题？
对不起;你确实从main返回了一个值。
注意：当我试图编译它时，我发现我没有
conio.h。这个标题应该是什么？
Andrew Poelstra写道：Andrew Poelstra写道：mi******@o2.pl 写道：我从文件中读取有问题。我想在文件中找到一些
字符串（例如名字），如果存在则在屏幕上显示第二和第三行的
。
我有这个文件：
姓名
姓氏
年龄
#include< stdio.h>
#include< conio.h>
FILE *文件;
main（）{
我会在这里指出你需要int main（ ）你需要回复一些东西。
这段代码到底是什么问题？
抱歉;你确实从main返回了一个值。
注意：当我试图编译它时，我发现我没有
conio.h。这个标题应该做什么？
该标题提供DOS特定的控制台I / O，在Borland中找到
C产品。
出于某种原因，许多新手喜欢使用`getch（）`它提供，
而不是标准的`getchar（）`。这通常是为了防止程序在IDE中完成后关闭
控制台窗口，这些窗口不会为你保持开放状态。
Hi, I have a problem with reading from file. I would like to find some
string(f e.g. name) in file, and if it exist show it on screen with
second and third line under.
I have this in file:
name
surname
age
#include <stdio.h>
#include <conio.h>
FILE *file;
main(){
char s[30];
int line = 0;
char name[]="kate";
file=fopen("text.txt","r");
if(!file) {
printf("file doesnt exist");
getch();
return 0;
}
while( line<4 )
{
fgets(s, sizeof(s), file);
if (strcmp(s,name)==0) printf("%s",s);
else {
printf("didnt find a string");
getch();
return 0;
}
line++;
}
fclose (file);
getch();
}
mi******@o2.pl wrote:Hi, I have a problem with reading from file. I would like to find some
string(f e.g. name) in file, and if it exist show it on screen with
second and third line under.
I have this in file:
name
surname
age
#include <stdio.h>
#include <conio.h>
FILE *file;
main(){
I''ll point out here that you need to have int main() and you need to
return something.
What exactly is your problem with this code?
Andrew Poelstra wrote:mi******@o2.pl wrote:Hi, I have a problem with reading from file. I would like to find some
string(f e.g. name) in file, and if it exist show it on screen with
second and third line under.
I have this in file:
name
surname
age
#include <stdio.h>
#include <conio.h>
FILE *file;
main(){
I''ll point out here that you need to have int main() and you need to
return something.
What exactly is your problem with this code?
Sorry; you did return a value from main.
Note: When I attempted to compile this, I found that I did not have
conio.h. What is this header supposed to do?
Andrew Poelstra wrote:Andrew Poelstra wrote:mi******@o2.pl wrote:Hi, I have a problem with reading from file. I would like to find some
string(f e.g. name) in file, and if it exist show it on screen with
second and third line under.
I have this in file:
name
surname
age
#include <stdio.h>
#include <conio.h>
FILE *file;
main(){
I''ll point out here that you need to have int main() and you need to
return something.
What exactly is your problem with this code?
Sorry; you did return a value from main.
Note: When I attempted to compile this, I found that I did not have
conio.h. What is this header supposed to do?
That header provides DOS-specific console I/O, and is found in Borland
C products.
For some reason, lots of newbies like to use `getch()` it provides,
instead of the standard `getchar()`. This is usually to prevent the
console window closing after the program finishes in IDEs that won''t
keep them open for you.
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