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parenthesis_checker.c
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parenthesis_checker.c
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#include <stdio.h>
#include <string.h>
#include "char_stack.h"
#define MAX 50
int main()
{
char exp[MAX],temp;
int i;
int flag = 1; //assuming that the expression is valid
printf("enter expression\n");
gets(exp);
for( i = 0; i < strlen(exp); i++)
{
if (exp[i]=='(' || exp[i]=='{' || exp[i]=='[')
{
push(exp[i]);
}
else if (exp[i]==')' || exp[i]=='}' || exp[i]==']')
{
if(tos==-1)
{
flag = 0;
break;
}
else
{
temp = pop();
if(exp[i]==')' && (temp=='[' || temp=='{'))
{ flag = 0;
break;}
if(exp[i]==']' && (temp=='{' || temp=='('))
{ flag = 0;
break;}
if(exp[i]=='}' && (temp=='(' || temp=='['))
{ flag = 0;
break;}
}
}
}
if (tos >=0)
flag=0;
if (flag == 1)
printf("\n valid expression\n");
else
printf(" invalid expression\n");
return 0;
}