Program to convert an Expression from Infix to Postfix

#include<stdio.h>
#include<stdlib.h>

#define MAXCOLS 80
#define TRUE 1
#define FALSE 0

void postfix(char*, char *);
int isoperand(char);
void popandtest(struct stack*, char*, int*);
int prcd(char, char);
void push(struct stack*, char);
char pop(struct stack*);


void main(){
char infix[MAXCOLS];
char postr[MAXCOLS];
int pos = 0;

while ((infix[pos++] = getchar()) != '\n' );
infix[--pos]='\0';
printf("%s%s", "the original infix expression is", infix);
postfix(infix, postr);
printf("%s\n", postr);
}   /* end of main */

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