C program to evaluate Postfix Expression using Stack

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Simple C program to evaluate Postfix Expression using Stack.

Code:

#include<stdio.h>

#include<conio.h>

#include<ctype.h>

#include<math.h>

int s[50];

int top=-1;

int flag=0;

int pop()

{

return(s[top--]);

}

push(int elem)

{

if(flag==1){

int num;

num=pop();

s[++top]=elem+10*num;

}

else if(flag==0){

s[++top]=elem;

flag=1;

}

}





main(){

char pofx[50],ch;

int i=0,op1,op2;

printf("Enter the Postfix Expression:");

fgets(pofx,100,stdin);

while( (ch=pofx[i++]) != '\n')

{

if(isdigit(ch)) push(ch-'0');

else if(ch==' ')

flag=0;

else

{

flag=0;

op2=pop();

op1=pop();

switch(ch)

{

case '+':push(op1+op2);break;

case '-':push(op1-op2);break;

case '*':push(op1*op2);break;

case '/':push(op1/op2);break;

case ‘^’; push(pow(op1,op2));break;

default:

printf("Input invalid ... give proper input\n");

return 0;

}

}

}

printf("Result: %d\n",s[top]);

getch();

}

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