//inf22.cpp
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <iostream.h>
char buf[999];
char infix[222], stmp[222], postfix[222];
void toPost(char*, char*);
double compute(char*);
int main( ) {
    fprintf(stderr, "Give me an infix expression and I will...\n");
 while(38==38) {
     fprintf(stderr, "type here: ");
     fgets(buf, sizeof(buf), stdin);
     strcpy(infix, buf);  //  infix = buf
     toPost(infix, postfix);
     double ans = compute(postfix);
///
     fprintf(stdout, "infix: %s\n", infix);
     fprintf(stdout, "postfix: %s\n", postfix);
     fprintf(stdout, "ans = %d\n", ans);
     fprintf(stderr, "Again(n, y) ? ");
     fgets(buf, sizeof(buf), stdin);
     if(toupper(buf[0]) != 'Y') break;
 }
 return 0;
} // main
void toPost(char*in, char*post) {
    char tmps[333];
    char * p;
    int k=1;
    strcpy(tmps, in);
    p = strtok(tmps, " (+-*/)");
    while(p!=0) {
         printf("%d: %s\n", k, p);
         p = strtok(0, " (+-*/)");    // ª`·N
         ++k;
     }
    //
    char*p2;  char oper;  char tmp;
    p2 = post;  p = in; 
    tmp = *p;
    while(tmp != 0) {   // char by char search
         if(strchr( "(+-*/)", tmp) ==0) {
              *p2 = tmp;
               ++p2;
         }else{
              *p2=' '  ;  // blank
              ++p2;
              oper = tmp;
              //  process this operator
         }
         ++p; tmp=*p;
    }
    *p2 = 0;  // NULL terminator
    //
    //printf("%d\n", strchr("(+-*/)", '3'));
    //
}
double compute(char*pfx) {
     double ans=0.0;
///
     return ans;
}