32_parenthesis_match_using_stack.c

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

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

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

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

void push(struct stack* ptr, char val){
    if(isFull(ptr)){
        printf("Stack Overflow! Cannot push %d to the stack\n", val);
    }
    else{
        ptr->top++;
        ptr->arr[ptr->top] = val;
    }
}

char pop(struct stack* ptr){
    if(isEmpty(ptr)){
        printf("Stack Underflow! Cannot pop from the stack\n");
        return -1;
    }
    else{
        char val = ptr->arr[ptr->top];
        ptr->top--;
        return val;
    }
}

int parenthesisMatch(char * exp, struct stack *sp){
    // Create and initialize the stack :=> "We dont do that here ( ͡° ͜ʖ ͡°)"

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

    if(isEmpty(sp)){
        return 1;
    }
    else{
        return 0;
    }
    
}
int main()
{
    struct stack* sp;
    sp->size = 100;
    sp->top = -1;
    sp->arr = (char *)malloc(sp->size * sizeof(char));

    
    char * exp = "((8)(*--$$9)))))()(";
    // Check if stack is empty
    if(parenthesisMatch(exp, sp)){
        printf("The parenthesis is matching");
    }
    else{
        printf("The parenthesis is not matching");
    }
    return 0;
}