c语言编程，如何将十进制转化为2进制

#include "stdio.h" #define StackSize 100 typedef int ElemType; typedef struct { ElemType elem[StackSize]; int top; }SqStack; InitStack(SqStack *pS) { pS->top=0; /* top指向栈顶的上一个元素 */ } int Push(SqStack *pS,Elem