C Program to implementing two Stacks on Single Array.

Data structures using C, Stack is a data structure in which the objects are arranged in a non linear order. In stack, elements are aded or deleted from only one end, i.e. top of the stack. In this program, we implement the two stacks using the single array. Read more about C Programming Language .

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#define SIZE 10 /* Size of Stack */
int s[SIZE],top[3]={0,-1,SIZE};
/* Global declarations */
push(int elem,int stno)
{
int pos; /* Function for PUSH operation */
if( Sfull()) printf("nn Overflow!!!!nn");
else
{
if(stno==1) pos= ++top[stno];
else pos=--top[stno];
s[pos]=elem;
}
}


int pop(int stno)
{ /* Function for POP operation */
int elem,pos;
if(Sempty(stno)){ printf("nnUnderflow!!!!nn");
return(-1); }
else
{
pos=top[stno];
elem=s[pos];
if(stno == 1)top[stno]--;
else
top[stno]++;
return(elem);
}
}

int Sfull()
{ /* Function to Check Stack Full */
if(top[1] == top[2]-1) return 1;
return 0;
}

int Sempty(stno)
{
/* Function to Check Stack Empty */
switch(stno)
{
case 1: if(top[1] == -1) return 1; else return 0;
case 2: if(top[2] == SIZE) return 1;else return 0;
}
}

display(int stno)
{ /* Function to display status of Stack */
int i;
if(Sempty(stno)) printf(" n Empty Stackn");
else
{
if(stno == 1)
{
for(i=0;i<=top[stno];i++)
printf("%dn",s[i]);
printf("^Top");
}
else
{
for(i=SIZE-1;i>=top[stno];i--)
printf("%dn",s[i]);
printf("^Top");
}
}
}

main()
{ /* Main Program */
int opn,elem,stno;
do
{
clrscr();
printf("n ### Stack Operations ### nn");
printf("n Stack Number (1,2): ");
scanf("%d",&stno);
printf("n Press 1-Push, 2-Pop,3-Display,4-Exitn");
printf("n Your option ? ");
scanf("%d",&opn);

switch(opn)
{
case 1: printf("nnRead the element to be pushed ?");
scanf("%d",&elem);
push(elem,stno); break;
case 2: elem=pop(stno);
if( elem != -1)
printf("nnPopped Element is %d n",elem);
break;
case 3: printf("nnStatus of Stack %d nn",stno);
display(stno); break;
case 4: printf("nn Terminating nn"); break;
default: printf("nnInvalid Option !!! Try Again !! nn");
break;
}
printf("nnnn Press a Key to Continue . . . ");
getch();
}while(opn != 4);
}


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