C++ or C Program for Push, Pop, Peek operations of Stack data structure.

File Name:- stack.cpp

#include<iostream.h>

#include<conio.h>

#define N 5

int stack[N],item, top=-1;

//push function

void push(){

if(top==N-1){

cout<<"Overflow Condition"<<endl;

getch();

return;

}

cout<<"Enter an Item to push"<<endl;

cin>>item;

top++;

stack[top]=item;

cout<<"item="<<item<<"is pushed\npush completed"<<endl;

getch();

return;

}

//pop function

void pop(){

if(top==-1){

cout<<"underflow Condition"<<endl;

getch();

return;

}

item=stack[top];

top--;

cout<<"item="<<item<<" is popped\npop completed"<<endl;

getch();

return;

}

//peekfunction

void peek(){

int i;

if(top==-1){

cout<<"Stack is Empty"<<endl;

getch();

return;

}

else{

cout<<"Top of the stack is="<<stack[top]<<endl<<"Top="<<top<<endl<<"peek completed"<<endl;

getch();

return;

}

//main function

void main(){

int ch;

while(1){

clrscr();

cout<<"Stack Operation:-\n1.PUSH\n2.POP\n3.PEEK\n4.EXIT\nenter your choice"<<endl;

cin>>ch;

switch(ch){

case 1:

push();

break;

case 2:

pop();

break;

case 3:

peek();

break;

case 4:

exit();

default:

cout<<"Wrong Choice\nTry Again !!"<<endl;

getch();

}}}

File Name:- stack.c

#include<stdio.h>
#include<conio.h>
#define N 5
int stack[N],top=-1,item;
void push(){
if(top==N-1){
printf("Overflow Condition\n");
getch();
return;
}
printf("Enter an Item to insert\n");
scanf("%d",&item);
top++;
stack[top]=item;
printf("push completed\n");
getch();
return;
}
void pop(){
if(top==-1){
printf("underflow Condition\n");
getch();
return;
}
item=stack[top];
top--;
printf("pop completed\n");
getch();
return;
}
void peek(){
int i;
if(top==-1){
printf("Stack is Empty\n");
getch();
return;
}
printf("Top element of the stack is %d\nTop=%d \npeek completed",stack[top],top);

getch();
return;
}
void main(){
int ch;
while(1){
clrscr();
printf("Stack Operation:-\n1.PUSH\n2.POP\n3.PEEK\n4.EXIT\nenter your choice\n");
scanf("%d",&ch);
switch(ch){
case 1: push();break;
case 2: pop();break;
case 3: peek();break;
case 4:
exit();
}
}
}