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  1. /* Experiment to find out what happens when prints's argument string contains \c, where c is some
  2. character not listed above. */
  3.  
  4. #include<stdio.h>
  5. int main(void)
  6. {
  7.     printf("a:\a\n"); /* valid */
  8.     printf("b:\b\n"); /* valid */
  9.     printf("c:\c\n");
  10.     printf("d:\d\n");
  11.     printf("e:\e\n"); /* valid */
  12.     printf("f:\f\n"); /* valid */
  13.     printf("g:\g\n");
  14.     printf("h:\h\n");
  15.     printf("i:\i\n");
  16.     printf("j:\j\n");
  17.     printf("k:\k\n");
  18.     printf("l:\l\n");
  19.     printf("m:\m\n");
  20.     printf("n:\n\n"); /* valid */
  21.     printf("o:\o\n");
  22.     printf("p:\p\n");
  23.     printf("q:\q\n");
  24.     printf("r:\r\n"); /* valid */
  25.     printf("s:\s\n");
  26.     printf("t:\t\n"); /* valid */
  27.     /*
  28.     * \u below stands for unicode.
  29.     * warning: universal character names are only valid in C++ and C99
  30.     * without anything it will give the error incomplete universal character.
  31.     * we will give 2603 unicode codepoint which stands for snowman
  32.     */
  33.     printf("u:\u2603"); /* valid */
  34.     printf("v:\v"); /* valid */
  35.     printf("w:\w");
  36.     /* \x is for hexadecimals. It should be followed by valid hexadecimal.
  37.      * Lets give D as hexadecimal value */
  38.     printf("x:\xD"); /* valid */
  39.     printf("y:\y\n");
  40.     printf("z:\z\n");
  41.     printf("A:\A\n");
  42.     printf("B:\B\n");
  43.     printf("C:\C\n");
  44.     printf("D:\D\n");
  45.     printf("E:\E\n"); /* valid */
  46.     printf("F:\F\n");
  47.     printf("G:\G\n");
  48.     printf("H:\H\n");
  49.     printf("I:\I\n");
  50.     printf("J:\J\n");
  51.     printf("K:\K\n");
  52.     printf("L:\L\n");
  53.     printf("M:\M\n");
  54.     printf("N:\N\n");
  55.     printf("O:\O\n");
  56.     printf("P:\P\n");
  57.     printf("Q:\Q\n");
  58.     printf("R:\R\n");
  59.     printf("S:\S\n");
  60.     printf("T:\R\n");
  61.  
  62.     /*
  63.     * \U below stands for unicode.
  64.     * error: incomplete universal character name \U
  65.     * without anything it will give the error incomplete universal character.
  66.     * we will give 2603 unicode codepoint which stands for snowman
  67.     */
  68.  
  69.     printf("U:\U00002603\n");
  70.     printf("V:\V\n");
  71.     printf("W:\W\n");
  72.     printf("X:\X\n");
  73.     printf("Y:\Y\n");
  74.     printf("Z:\Z\n");
  75.     printf("0:\0\n");
  76.     printf("1:\1\n"); /* valid */+
  77.     printf("2:\2\n"); /* valid */
  78.     printf("3:\3\n"); /* valid */
  79.     printf("4:\4\n"); /* valid */
  80.     printf("5:\5\n"); /* valid */
  81.     printf("6:\6\n"); /* valid */
  82.     printf("7:\7\n"); /* valid */
  83.     printf("8:\8\n");
  84.     printf("9:\9\n");
  85.     printf("~:\~\n");
  86.     printf("`:\`\n");
  87.     printf("!:\!v");
  88.     printf("@:\@\n");
  89.     printf("#:\#\n");
  90.     printf("$:\$\n");
  91.     printf("%:\%\n"); /* warning: unknown conversion type character in : in format. Spurious trailing % in format */
  92.     printf("^:\^\n"); /* warning: unknown escape sequence \^ */
  93.     printf("&:\&\n");
  94.     printf("*:\*\n");
  95.     printf("(:\(\n"); /* valid */
  96.     printf("):\)\n");
  97.     printf("_:\_\n");
  98.     printf("-:\-\n");
  99.     printf("+:\+\n");
  100.     printf("{:\{\n"); /* valid */
  101.     printf("[:\[\n"); /* valid */
  102.     printf("}:\}\n");
  103.     printf("]:\]\n");
  104.     printf("|:\|\n");
  105.     printf("\:\\\n");
  106.     printf("a:\a\n"); /* valid */
  107.     printf("::\:\n");
  108.     printf(";:\;\n");
  109.     /* escape the double-quotes */
  110.     printf("\":\"\n"); /* valid */
  111.     printf("':\'\n"); /* valid */
  112.     printf("<:\<\n");
  113.     printf(",:\,\n");
  114.     printf(">:\>\n");
  115.     printf(".:\.\n");
  116.     printf("?:\?\n"); /* valid */
  117.     printf("/:\/\n");
  118. }
  119.  
Success #stdin #stdout 0s 4388KB
comments (?)
stdin 
Standard input is empty
stdout 
a:
b:
c:c
d:d
e:
f:
g:g
h:h
i:i
j:j
k:k
l:l
m:m
n:

o:o
p:p
q:q
r:
s:s
t:	
u:☃v:w:wx:
y:y
z:z
A:A
B:B
C:C
D:D
E:
F:F
G:G
H:H
I:I
J:J
K:K
L:L
M:M
N:N
O:O
P:P
Q:Q
R:R
S:S
T:R
U:☃
V:V
W:W
X:X
Y:Y
Z:Z
0:1:
2:
3:
4:
5:
6:
7:
8:8
9:9
~:~
`:`
!:!v@:@
#:#
$:$
%:%
^:^
&:&
*:*
(:(
):)
_:_
-:-
+:+
{:{
[:[
}:}
]:]
|:|
:\
a:
:::
;:;
":"
':'
<:<
,:,
>:>
.:.
?:?
/:/
https://ideone.com/9Gk6ko
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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