Evaluation of Expression

#include<stdio.h>

#include<string.h>

#include<ctype.h>

main()

{

char
ans;

do

{

char
postfix[10],x;

int
stack[10],op1,op2;

int
top=-1,i=0;

clrscr();

printf("\n\n\t\t\tEVALUATION
OF EXPRESSION");

printf("\n\t\t\t************************");

printf("\n\nENTER
THE POSTFIX EXPRESSION :->");

fflush(stdin);

gets(postfix);

x=postfix[i];

while(x!='\0')

{

if(isdigit(x))

stack[++top]=x-'0';

else

{

op2=stack[top];

op1=stack[top-1];

top--;

if(x=='+')

stack[top]=op1+op2;

else if(x=='-')

stack[top]=op1-op2;

if(x=='*')

stack[top]=op1*op2;

if(x=='/')

stack[top]=op1/op2;

}

x=postfix[++i];

}

printf("\n\nTHE VALUE OF GIVEN EXPRESSION IS :->%d",stack[0]);

printf("\n\nDO U CONTINUE (Y/N):->");

scanf("%s",&ans);

}while(ans=='y'||ans=='y');

getch();

}