>>83
#include <stdio.h>
#include <math.h>

int dec2bin(int, char*);

int main(void)
{
char bin[5];
int i = 10;

dec2bin(i, bin);

printf("%s\n", bin);

return 0;
}
int dec2bin(int dec, char* buf)
{
int i, bin = 0;

for (i=0;i<4;i++) {
if (i == 0)
bin += dec % 2;
else
bin += (int)pow(10, i)*(dec%2);
dec /= 2;
}
sprintf(buf, "%04i", bin);
return dec;
}