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how does " for (int j = 0; j < n || !putchar('\n'); j++) " work


By : Floyd Morris Noell
Date : September 23 2020, 04:00 PM
seems to work fine Because of ||, the function putchar will only be called when j < n is false. Now, j < n is false at the end of every line. That's why you get \n at the end of every line.
code :


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Is getchar() equivalent to scanf("%c") and putchar() equivalent to printf("%c")?


By : Kartik Bhatia
Date : March 29 2020, 07:55 AM
I hope this helps . Generally speaking yes they are the same.
But they are not in a few nitpicky ways. The function getchar is typed to return int and not char. This is done so that getchar can both all possible char values and additionally error codes.
code :
char c = getchar();

haskell-mode prints "*Main>" on same line after using putChar?


By : Riki Quaresma
Date : March 29 2020, 07:55 AM
it fixes the issue putChar c writes just that one character to the console. That's what it's intended for. So unless you print a newline to the console afterward, whether with putChar, putStr or whatever other methods, the following output goes to the same line. The behaviour is the same as with C, or if you cat a file without trailing newline. It's ubiquitous. The only feasible alternative (it's unfeasible to check each output whether it ended with a newline) is to output a newline before the ghci or shell prompt unconditionally, which would lead to many annoying blank lines.

C++ Using "putchar" to output a word in Binary


By : Aleksy Sokolowski
Date : March 29 2020, 07:55 AM
I hope this helps . The problem is operator<<. The stream insertion operator is designed to convert it's input to text format and pass the formatted text to the stream.
code :
  file << putchar((word >> 24) & 0xff);
       ^^----> this is the problem.

Should I use printf("\n") or putchar('\n') to print a newline in C?


By : Ky Đoan
Date : March 29 2020, 07:55 AM
I wish did fix the issue. It will make no difference which one you chose if you're using a modern compiler[1]. Take for example the following C code.
code :
#include <stdlib.h>
#include <stdio.h>

void foo(void) {
    putchar('\n');
}

void bar(void) {
    printf("\n");
}
movl    $10, %edi
popq    %rbp
jmp _putchar                ## TAILCALL

I used the function "putchar()" to print the result of a test, but i got a question mark instead


By : user3309495
Date : March 29 2020, 07:55 AM
I wish did fix the issue. First, accepting that the comparison getchar()!=EOF will yield a Boolean value, which will be converted to either 1 (for true) or 0 (false) when interpreted as any integral type, the statement:
code :
printf("%d",getchar()!=EOF);
putchar(c);
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