C Program to Convert Infix to Postfix

hey people please please please help me out with this. i have got my submission tommorrow and i have really worked hard on this i dont want it to turn out bad. this is a c program to convert infix expression to postfix without considering parentheses and already accepting that the given expression is a valid infix expression. what happens is the out is comin really weird.

Code:

#include<stdio.h>
#include<conio.h>
#include<string.h>
int prece(char j);
void main()
{
	char infix[10],stack[5],output[10],j;
	int k=0,l=0,i,a,b;
	stack[k]=0;
	printf("write the infix expression to be converted to postfix");
	scanf("%s",infix);
	for(i=0;i<10;i++)
	{
		a=prece(infix[i]);
		b=prece(stack[k]);
		if(a<=b)
		{
			output[l]=infix[i];
			l++;
		}
		else
		{
			stack[k]=infix[i];
			k++;

		}
	}
	for(i=k;i>0;i--)
	{
		output[l]=stack[i];
		l++;
	}
	printf("%s",output);
	getch();
}
int prece(char j)
{
	if(j=='*'||j=='/')
	{
	   j=3;
	}
	else
	{
	    if(j=='+'||j=='-')
	    {
	       j=2;
	    }
	    else
	    {
	       j=1;
	    }
	}
	return j;
}

 

Re: c program to convert infix expression to postfix without considering parentheses

Check InFix to PostFix and PostFix expression evaluation.

 

Re: c program to convert infix expression to postfix without considering parentheses

hey thanks a lot !

 

My Pleasure.