Quote

kabel@linux:~/progs/C> cat convert.c
#include <stdio.h>

void dez_to_bin_sideeffect (int);
char * dez_to_bin_functional (int);

int main (void) {
dez_to_bin_sideeffect (34);
printf ("%s\n", dez_to_bin_functional (34));
return 0;
}

void dez_to_bin_sideeffect (int zahl) {
int i = 0;

for (i = 7; i >= 0; i--) {
printf ("%d",(zahl&(1<<i))?1:0);
}

printf ("\n");
}

char * dez_to_bin_functional (int zahl) {
int i = 0, j = 0;
char *binary_rep = NULL;
binary_rep = (char *) calloc (sizeof (char), i);
for (i=7, j=0; i >= 0; i--, j++) {
binary_rep[j] = (zahl&(1<<i)) ? '1' : '0';
}
return binary_rep;
}
kabel@linux:~/progs/C> make convert
cc convert.c -o convert
kabel@linux:~/progs/C> ./convert
00100010
00100010
kabel@linux:~/progs/C>