printf("\110\x6F\154\x61"); // Used in a string literal. printf("%c\n", '\x21'); // Used in a character constant. // -> Hola!+
getchar function reads one character from the process standard input and
+returns its value as an int.
+Ctrl-D in the
+terminal), it returns EOF
+EOF is a define, usually set as -1. That is why getchar returns
+an int instead of a char as it needs an extra value for EOF.getchar needs #include <stdio.h>
+EOF is part of <stdio>, search for "getchar"
+here: https://pubs.opengroup.org/onlinepubs/9699919799
+It should work like this:
+$ cat /etc/passwd | ./a.out > passwd
+$ diff passwd /etc/passwd
+$ echo $?
+0
+if ((c = getchar()) == EOF)
+ return (0);instead of:
+c = getchar();
+if (c == EOF)
+ return (0);However, do not abuse it as you may create a hard to read code. Note the
+parentheses around the assignment. The = operator has a lower priority than
+the == operator. If the parens are not used, the following would happen:
if (c = getchar() == EOF) would be evaluated as:
if (c = (getchar() == EOF)), meaning that c would be either 0 or 1 based
+on whether we read a character or the terminal input is closed.
We will learn more about operator priority later in the semester.
+🔑 getchar.c
sizeof operatorsizeof operator computes the byte size of its argument which is either
@@ -960,52 +1006,6 @@ 🔑 ascii-hex.c
-getchar function reads one character from the process standard input and
-returns its value as an int.
-Ctrl-D in the
-terminal), it returns EOF
-EOF is a define, usually set as -1. That is why getchar returns
-an int instead of a char as it needs an extra value for EOF.getchar needs #include <stdio.h>
-EOF is part of <stdio>, search for "getchar"
-here: https://pubs.opengroup.org/onlinepubs/9699919799
-It should work like this:
-$ cat /etc/passwd | ./a.out > passwd
-$ diff passwd /etc/passwd
-$ echo $?
-0
-if ((c = getchar()) == EOF)
- return (0);instead of:
-c = getchar();
-if (c == EOF)
- return (0);However, do not abuse it as you may create a hard to read code. Note the
-parentheses around the assignment. The = operator has a lower priority than
-the == operator. If the parens are not used, the following would happen:
if (c = getchar() == EOF) would be evaluated as:
if (c = (getchar() == EOF)), meaning that c would be either 0 or 1 based
-on whether we read a character or the terminal input is closed.
We will learn more about operator priority later in the semester.
-🔑 getchar.c
Note that home assignments are entirely voluntary but writing code is the only way to learn a programming language.