C语言实现逆波兰式实例

代码如下:#include<stdio>#include<string> typedef struct{char s[20][20];int top;}SQ; void copystr(char *a,char *b){    int i=0;    do    {        b[i]=a[i];        i++;    }    while(a[i]!=’\0′);    b[i]=’\0′;} void voidSQ(SQ *s){    s->top=-1;} int ifempty(SQ *s){    return(s->top==-1);} void push(S