我怎样才能使用scanf获得字符串呢？

Question

How can i use scanf to read string with blank space( without enter )? And i also want this program to stop whenever input is EOF .

I used the following code:

int main()      //this is not the whole program
{
    char A[10000];
    int length;

    while(scanf(" %[^\n]s",A)!=EOF);
    {
        length=strlen(A);
        print(length,A); 
        //printf("HELLO\n");
    }


    return 0;
}

But it is reading two EOF(ctrl+Z) to stop the program.can anyone give me any suggestion?

Answer 1

it is reading two EOF(ctrl+Z) to stop the program

No. You may be pressing ^Z twice, yet scanf() is only "reading" one end-of-file EOF . That is just how your keyboard/OS interface works. Research how to signal end-of-file.

Other changes

char A[10000];
// while(scanf(" %[^\n]s",A)!=EOF);
// Drop final `;`  (That ends the while block)
// Add width limit
// Compare against the desired result, 1, not against one of the undesired results, EOF
// Drop the 's'
while(scanf(" %9999[^\n]", A) == 1) {
    length=strlen(A);
    // print(length,A); 
    print("%d <%s>\n", length, A); 
    //printf("HELLO\n");
}