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// default base is decimal to binary
// run program with flag to start with different base
#include<stdio.h>
#include<stdlib.h>
typedef struct stack {
int * base;
int top;
int size;
} Stack;
void getSpace(Stack * s)
{
if (s->size == 0)
{
s->size = 1;
s->base = (int *) calloc (s->size,sizeof(int));
}
else
{
s->size += 1;
s->base = (int *) realloc (s->base, sizeof(int) * s->size);
}
}
void conversion(Stack * s, int from, int to)
{
while (from != 0)
{
if (s->size <= s->top)
getSpace(s);
s->base[s->top++] = from % to;
from /= to;
}
}
void print(Stack * s, int from)
{
printf("origin\t\tbinary\n");
printf("%d\t\t",from);
while (s->top != 0)
printf("%d",s->base[--s->top]);
s->top = 0;
putchar('\n');
}
int getNumber(void)
{
int tmp;
if (scanf("%d", &tmp) != 1)
exit(EXIT_SUCCESS);
return tmp;
}
int main(void)
{
Stack storage = {NULL, 0, 0};
int from = getNumber();
int to = 2;
conversion(&storage,from,to);
print(&storage,from);
free(storage.base);
return 0;
}
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