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I encountered a compilation problem while learning c language

compilation problem

F:\Codefield\CODE_C\C_Single\exercise\string_wenkai\2_1.c: In function 'main':

F:\Codefield\CODE_C\C_Single\exercise\string_wenkai\2_1.c:6:29: warning: comparison between pointer and integer
while((ch = getchar()) ! = "EOF"))
^~
F:\Codefield\CODE_C\C_Single\exercise\string_wenkai\2_1.c:6:38: error: expected statement before ')' token
while((ch = getchar()) ! = "EOF"))
^

The

build is complete, but there is an error.

Insert code with code block function, do not paste screenshot. Answer rate decreased by 50% without using code blocks

F:\Codefield\CODE_C\C_Single\exercise\string_wenkai\2_1.c: In function 'main':

The

build is complete, but there is an error.

I don't know how to write this thing

#include"stdio.h"
#include"stdlib.h"
int main(int argc, char const *argv[])
{
    int ch;
    while ((ch = getchar()) != EOF))
    {
        putchar(ch);
    }
    system("pause");
    return 0;
}

Theoretically(ch = getchar())! = "EOF") gives a value that makes the while valid, but vscode keeps reporting an error on it.

I encountered a compilation problem while learning c language

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0 Answer

diaowanglu 注册会员
2023-01-25 19:05

Answer is not easy, answer useful please adopt, click on the right side of the answer to adopt! The
error is caused by you comparing characters to strings("EOF").(ch = getchar())! = EOF. EOF is a special constant that represents the end of a file. It is a macro definition, usually -1, in < stdio.h> Is defined in. You have an extra close parenthesis in the while statement that needs to be removed or it will compile incorrectly.

while ((ch = getchar()) != EOF)

Modified code:

#include 
#include 

int main(int argc, char const *argv[])
{
int ch;
while ((ch = getchar()) != EOF)
{
putchar(ch);
}
system("pause");
return 0;
}

modified the EOF and removed the extra closing parenthesis and should compile and run properly. This code reads the input all the way to the end of the file(EOF) and outputs the read characters to the screen.

Where the phrase system("pause") stops the console window closing on windows, delete this sentence if you are running on another system.

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dwj313 注册会员
2023-01-25 19:05

Remove the close parenthesis after EOF in line 6.

#include"stdio.h"
#include"stdlib.h"
int main(int argc, char const *argv[])
{
    int ch;
    while ((ch = getchar()) != EOF)
    {
        putchar(ch);
    }
    system("pause");
    return 0;
}

Agree 0 0Comment

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Publish Time: 2023-01-25 19:05

Update Time: 2023-01-25 19:05