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#define kSpace 0x20

char buf[] = {0x42, 0x73, 0x75, 0x27, 0x13, 0x1C, 0x68, 0x1B, 0x64};
...

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void **node = malloc(sizeof(void *) * 3);  /* A new node */

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Service* service = services->at(0);
// or
// Service* service = (*services)[0];

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/* Transforms a number to a string
 * e.g 1234 => "1234"
 *
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You need to link to the maths library as pointed out above. You have a statement of the form include<math.h> the function log10, ceil etc are in that file and the compiler needs to know where to get it from.

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cc 49-simplest-of-mallocs-examples.cc -lm

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while(*s){t=*s++-32;for(i=0;i<t>>5;i++,m++)p(' ')for(i=
...

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#include <stdio.h>
#define p(a) putchar(a);
int main(void){unsigned char*s="Zz[»ŸYÝšÑi!q!á©a‰AáA¡z!aAÑáº!Q©!Áº!A:!19"
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#define tw(a,b) a(),b()
#define twd(a,b,c) a(){tw(b,c);}
#define ptd(a,b,s,d) a(){b;printf(s);d;}
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char*a="%c\0  \0_/\\_\0__\0/ /\0/ _ \\/ ",*f,c,n,*q="e5 m1_e4 m1\ne1m3_ / "
"_/m1 m2_p1m2e1m2\n / m1/ -_) _/ _ `/ m1/ m1t1m1/\n/_/e1\\m1/_/ \\_,h3m1/_"
"/\n\ne>m1e2m1\ne1m1 _e1m1 m1e1m3_e1m1_p1m1 p1\n /e1' \\p2 / m1t1_e1/ -_)_"
...

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int k=0;
const char *const LITERAL_1 =
"#CB#_,ab:@BbBXb\\bG]N_2JNH4`X:.MRLA,"
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_=0;c(q){q<0?putchar("`',)( \n-\\_/"[q+11]):c(("!A@!]*_`8>@"
"`@V`Z`E[L]0HLF2^V8,KPJ?*_?&H^'@DPR@PJ%!!!!]QHY.PH``ZP[L;3*"
"42VKKP754F`ZOJ?PXYM+RXYPR:PRHXZ3!^P*"[_/6]-33>>_++%6&1?"FL"
...

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#include <stdio.h>
int main(void)
{
...

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_=0;c(q){q<0?putchar("`',)( \n-\\_/"[q+11]):c(("#"
"CB#_,ab:@BbBXb\\bG]N_2JNH4`X:.MRLA,aA(J`)BFRTBRL"
"'####_SJ[0RJbb\\R]N=5,64XMMR976Hb\\QLARZ[O-TZ[RT"
...