Slip 21_1: Write a program that reverses a string of characters. The function should use a stack library (cststack.h). Use a static implementation of the stack.

-

 Solution

Header File : cststack.h

#include<stdio.h>

char s[20];

int top;

void init()

{

 top==-1;

}

int isempty()

{

 if(top==-1)

 return 1;

 else

 return 0;

}

int isfull()

{

 if(top==19)

 return 1;

 else

 return 0;

}

void push(char ch)

{

 if(isfull()==1)

 printf("Stack is full");

 else

 {

 top++;

 s[top]=ch;

 }

}

char pop()

{

 char ch;

 if(isempty()==1)

 printf("Stack is empty");

 else

 {

 ch=s[top];

 top--;

 return ch;

 }

}

Program File :

#include<stdio.h>

#include"stack.h"

int main()

{

 init();

 char str[20];

 int i;

 printf("Enter String: ");

 scanf("%s",&str);

 for(i=0;str[i]!='\0';i++)

 {

 push(str[i]);

 }

 printf("Reversed string: ");

 while(!isempty())

 {

 printf("%c",pop());

 }

}



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