读取整数，直到C中的EOF

Question

I need to read all integers until the EOF. I'm trying this code and the problem is that the program doesn't detect the EOF and keeps running. What I need is to receive all the data and proceed to the next line of code automatically (the code works with pressing Ctrl-D after the input).

int x, sum = 0;

while (scanf("%d", &x) == 1) {
    sum += x;
}

if (feof(stdin)) {
    printf ( "SUM: %d\n", sum );
} else {
    printf("ERROR\n");
}

return 0;

Answer 1

How do you want to specify EOF?

• ^D is the way to do it in the terminal in Unix. In the Windows terminal, ^Z does the same thing. scanf will return -1 and feof() will be non zero. But any further input from stdin will fail too.

• Do you want to just hit the enter key? If so, you have to check for that after scanf , otherwise the next call to scanf will read the linefeed and ignore it.

• If you type something that is neither white space nor a number, scanf will return 0 and leave the unmatched character in the input stream. Your program will print ERROR . Is this what is happening?