用c语言的栈来编写逆波兰公式的程序

如题，代码如下，欢迎探讨！！！[code=C/C++][/code]#include <stdio.h>typedef int ElemType; #define MAXNUM 16struct stack{ ElemType data[MAXNUM]; int top;};void StackInit(struct stack *stack){ int i = 0; for(;i < MAXNUM;i++) { stack->data[i] = 0; } stack->top = 0; }void StackPush(struct stack *stack,ElemType c){ if(MAXNUM == stack->top) { printf("The stack is full "); return; } stack->data[stack->top++] = c;}ElemType StackPop(struct stack *stack){ if(0 == stack->top) { printf("The stack is empty "); return 0; } return stack->data[--stack->top];}void Postfixevaluation(struct stack *stack){ return; }int ChangeToPostfix(char *str){ int i = 0,flag = 0; int c,ch; struct stack ch_stack; struct stack op_stack; StackInit(&ch_stack); StackInit(&op_stack); while( != (c = *(str + i))) { if((* == c) || (/ == c) || (( == c)) { flag = 0; StackPush(&op_stack,c); } else if() == c) { flag = 0; while(( != (c = StackPop(&op_stack))) { StackPush(&ch_stack,c); } if(0 == op_stack.top) { printf("the ( hasnt found when the ) come in! "); return -1; } } else if((+ == c)|| (- == c)) { flag = 0; if(0 != op_stack.top) { while(( != (ch = StackPop(&op_stack))) { StackPush(&ch_stack,ch); if(0 == op_stack.top) { break; } } } StackPush(&op_stack,c); } else if((c >= 0) && (c <= 9)) { if(0 == flag) { StackPush(&ch_stack,(c - 0)); flag = 1; } else { StackPush(&ch_stack,10 * StackPop(&ch_stack) + (c - 0)); } } i++; } while(0 != op_stack.top) { StackPush(&ch_stack,StackPop(&op_stack)); } Postfixevaluation(&ch_stack); for(i = 0;i < ch_stack.top;i++) { if(+ == ch_stack.data[i]) { printf("+.."); } else if(- == ch_stack.data[i]) { printf("-.."); } else if(* == ch_stack.data[i]) { printf("*.."); } else if(/ == ch_stack.data[i]) { printf("/.."); } else { printf("%d..",ch_stack.data[i]); } } return 0;}int main(void){ char str[] = "12 + 34 * 435 - 5 / 1"; printf("The result should be : "); printf("12 34 435 * + 5 1 / - [= 8] "); if(-1 == ChangeToPostfix(str)) {printf("ChangeToPostfix() error ");return 1;}return 0;}