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C program for Stack implementation using array

#include "stdio.h"
#include "conio.h"

#define size 5

int stack[size] = {0};

int top = -1;

void push(int value)
{
if(top < size)
{
top++;
stack[top] = value;
}
else
{
printf("Stack overflow \n");
}
}

void pop()
{
if(top >= 0)
{
printf("The popped element is:\t %d \n", stack[top]);
stack[top] = 0;
top--;
}

else
{
printf("Stack underflow \n");
}


}
void display()
{

                 int i;

for(i=size - 1;i>=0;i--)
{
printf(" %d \n",stack[i]);
}
}

void tos()
{
printf("The value at top is %d", stack[top]);
}

int main()
{

int i,j, ch=0 ,value = 0;

while(1)
{
printf("\n Please Enter the choice. \n");
printf("1 for push\n 2 for pop \n 3 for display\n 4 for top \t  \n 5 for exit");
scanf("%d",&ch);

switch(ch)
{
case 1:
printf("\n Please Enter the number to be inserted: \t");
scanf("%d", &value);
push(value);
break;

case 2:

pop();

break;

case 3:

display();

break;


case 4:
tos();

break;

case 5:

exit(0);



}
}

}