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// Stack - Array based implementation.
// Creating a stack of integers.
#include<stdio.h>
 
#define MAX_SIZE 5
 
int A[MAX_SIZE]; // integer array to store the stack
int top = -1;  // variable to mark top of stack in array
 
// Push operation to insert an element on top of stack.
void Push(int x)
{
  if(top == MAX_SIZE-1) { // overflow case.
		printf(" stack overflow\n");
		return;
	}
	A[++top] = x;
}
 
// Pop operation to remove an element from top of stack.
void Pop()
{
	if(top == -1) { // If stack is empty, pop should throw error.
		printf("Error: No element to pop\n");
		return;
	}
	top--;
}
 
 
// This will print all the elements in the stack at any stage.
void display() {
	int i;
	printf("Stack: ");
	for(i = 0;i<=top;i++)
		printf("%d ",A[i]);
	printf("\n");
}
 
int main() {
  // Code to test the implementation.
  // calling display() after each push or pop to see the state of stack.
Push(10);
push(20);
push(30);
push(40);
push(50);
pop();
display();
}
 

prog.c: In function 'main':
prog.c:44:1: warning: implicit declaration of function 'push' [-Wimplicit-function-declaration]
 push(20);
 ^
prog.c:48:1: warning: implicit declaration of function 'pop' [-Wimplicit-function-declaration]
 pop();
 ^
prog.c:50:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/home/cX4FWD/ccxLK83f.o: In function `main':
prog.c:(.text.startup+0x20): undefined reference to `push'
prog.c:(.text.startup+0x2c): undefined reference to `push'
prog.c:(.text.startup+0x38): undefined reference to `push'
prog.c:(.text.startup+0x44): undefined reference to `push'
prog.c:(.text.startup+0x49): undefined reference to `pop'
collect2: error: ld returned 1 exit status

Standard output is empty