Write this without lib and string.h files

[muhammadlodhi]

plz urgent help thanks i need this without lib and string files

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
struct Node;
typedef struct Node * PtrToNode;
struct Node
{
    char element;
    PtrToNode Next;
};
 
PtrToNode MakeEmpty(PtrToNode L)
{
    L= new(Node);
    L->Next=NULL;
    return L;
}
 
void Push(PtrToNode L,char x)
{
    PtrToNode S;
    S= new(Node);
    S->element=x;
    S->Next=L->Next;
    L->Next=S;
}
 
char Pop(PtrToNode L)
{
    PtrToNode P;
    P=L->Next;
    char x=P->element;
    L->Next=P->Next;
    free(P);
    return x;
}
int main()
{
    PtrToNode L;
    L= MakeEmpty(NULL);
    char Input[1000];
    int i;
    printf("please enter your equation:");
    scanf("%s",Input);
 
    for (i = 0;i<strlen(Input);i++)
    {
    if (Input[i]=='(')
    {
        Push(L,Input[i]);
    }
    if (Input[i]==')')
    {
        if (L->Next==NULL)
        {
        printf("incorrect");
        return 0;
        }
        else
        Pop(L);
    }
 
 
 
    }
    if (L->Next==NULL)
    printf("correct");
    else
    printf("incorrect");
    getch();
    return 0;
}

[Banfa]

If you are not using any libraries how do you propose to get user input and to create output for the user to see?

[donbock]

Methodically go through your code to find the library functions that you're using. Then either replace the library function with a function of your own that does the same thing (for example, replace strlen with my_strlen) or change the design of the program to eliminate the need for the library function (for example, replace malloc/new with static variables).

As Banfa pointed out, you will find it pretty much impossible to write your own versions of the console I/O functions. Are you sure that is a requirement?