stack1

#include <stdio.h> 
int stack[100],i,j,choice=0,n,top=-1; 
 void push(); 
 void pop(); 
 
 void display(); 
 int main () 
{ 
printf("Enter the number of elements in the stack :"); 
scanf("%d",&n); 
 while(choice != 4) 
 { 
printf("\n1.Push\n2.Pop\n3.display\n4.Exit"); 
printf("\n Enter your choice:"); 
scanf("%d",&choice); 
 switch(choice) 
 { case 1: 
 { 
push(); break; 
} 
 case 2: 
 { 
pop(); 
break; } 
case 3: 
 { 
 display(); 
break; } 
 case 4: 
 { return 
0; break; 
 } default: 
 { 
printf("\nPlease Enter valid choice"); 
 } 
 }; 
 } 
} 
void push () 
{ int val; 
 if (top == n ) 
printf("\n Overflow"); 
 else 
 { 
printf("\nEnter the value:"); 
scanf("%d",&val); 
 top = top +1; 
 stack[top] = val; 
 } 
} 
void pop () 
{ 
 if(top == -1) printf("\nUnderflow"); 
 else 
 { 
 top = top -1; 
printf("%d deleted successfully",stack[top+1]); 
 } 
 
} 
void display() 
{ 
 for (i=top;i>=0;i--) 
 { 
printf("%d\n",stack[i]); 
 } 
 if(top == -1) 
 { 
printf("\nStack is empty"); 
 } 
}