Complete C program to implement multiple stacks
#include <stdio.h>
#include <conio.h>
#define MAX 10
int stack[MAX],topA=–1,topB=MAX;
void pushA(int val)
{
if(topA==topB–1)
printf("\n OVERFLOW");
else
{
topA+= 1;
stack[topA] = val;
}
}
int popA()
{
int val;
if(topA==–1)
{
printf("\n UNDERFLOW");
val = –999;
}
else
{
val = stack[topA];
topA––;
}
return val;
}
void display_stackA()
{
int i;
if(topA==–1)
printf("\n Stack A is Empty");
else
{
for(i=topA;i>=0;i––)
printf("\t %d",stack[i]);
}
}
void pushB(int val)
{
if(topB–1==topA)
printf("\n OVERFLOW");
else
{
topB –= 1;
stack[topB] = val;
}
}
int popB()
{
int val;
if(topB==MAX)
{
printf("\n UNDERFLOW");
val = –999;
}
else
{
val = stack[topB];
topB++;
}
}
void display_stackB()
{
int i;
if(topB==MAX)
printf("\n Stack B is Empty");
else
{
for(i=topB;i<MAX;i++)
printf("\t %d",stack[i]);
}
}
void main()
{
int option, val;
clrscr();
do
{
printf("\n *****MENU*****");
printf("\n 1. PUSH IN STACK A");
printf("\n 2. PUSH IN STACK B");
printf("\n 3. POP FROM STACK A");
printf("\n 4. POP FROM STACK B");
printf("\n 5. DISPLAY STACK A");
printf("\n 6. DISPLAY STACK B");
printf("\n 7. EXIT");
printf("\n Enter your choice");
scanf("%d",&option);
switch(option)
{
case 1: printf("\n Enter the value to push on Stack A : ");
scanf("%d",&val);
pushA(val);
break;
case 2: printf("\n Enter the value to push on Stack B : ");
scanf("%d",&val);
pushB(val);
break;
case 3: val=popA();
if(val!=–999)
printf("\n The value popped from Stack A = %d",val);
break;
case 4: val=popB();
if(val!=–999)
printf("\n The value popped from Stack B = %d",val);
break;
case 5: printf("\n The contents of Stack A are : \n");
display_stackA();
break;
case 6: printf("\n The contents of Stack B are : \n");
display_stackB();
break;
}
}while(option!=7);
getch();
}
Output
- PUSH IN STACK A
- PUSH IN STACK B
- POP FROM STACK A
- POP FROM STACK B
- DISPLAY STACK A
- DISPLAY STACK B
- EXIT
Enter your choice : 1
Enter the value to push on Stack A : 10
Enter the value to push on Stack A : 15
Enter your choice : 5
The content of Stack A are:
15 10
Enter your choice : 4
UNDERFLOW
Enter your choice : 7