find the mistake plzzzzzz

Question

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

struct stack
{
int top;
int size;
char *arr;
};

int isFull(struct stack *sp)
{
if(sp->top==sp->size-1)
{
return 1;
}
else{
return 0;
}

}

int isEmpty(struct stack *sp)
{
if(sp->top==-1)
{
return 1;
}
return 0;
}

void push(struct stack *sp,char val)
{
sp->top++;
sp->arr[sp->top]=val;
}

char pop(struct stack *sp)
{
char r=sp->arr[sp->top];

sp->top--;
return r;
}

int isEqual(char a,char b)
{
if(a=='(' && b==')')
{
return 1;
}
if(a=='[' && b==']')
{
return 1;
}
if(a=='{' && b=='}')
{
return 1;
}

return 0;
}

int match(char *ex)
{
struct stack *sp=(struct stack*)malloc(sizeof(struct stack));
sp->size=100;
sp->top=-1;
sp->arr=(char*)malloc(sp->size * sizeof(char));

char pop_val;

for(int i=0; ex[i]!='\0'; i++)
{
if(ex[i]== '{' || ex[i]== '[' || ex[i]== '(')
{
if(isFull(sp))
{
return 0;
}
else
{
push(sp,ex[i]);
}
}
else if(ex[i]== '}' || ex[i]== ']' || ex[i]== ')')
{
if(isEmpty(sp))
{
return 0;
}

pop_val = pop(sp);

if(isEqual(pop_val,ex[i]))
{
return 1;
}
else
{
return 0;
}
}
}

if(isEmpty(sp))
{
return 1;
}

else
{
return 0;
}

}

int main()
{

char *ex = "[4-6](((8){(9-8)})";

if(match(ex))
{
printf("true \n");
}
else
{
printf("false \n");
}

return 0;
}

Answer 1

No problem

Answer 2

It is working