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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. #define MAX_SIZE 100
  5.  
  6.  
  7.     int stack[MAX_SIZE];
  8.     int top=-1,count=0;
  9. int size()
  10. {
  11. return count;
  12. }
  13.  
  14. void push(int x, int y)
  15.  {
  16.     if (count+2< MAX_SIZE )
  17.  {
  18.         stack[++top] = x;
  19.         stack[++top] = y;
  20.         printf("Pushed\n");
  21.     } else {
  22.         printf("Overflow\n");
  23.     }
  24. }
  25.  
  26. void pop() {
  27.     if (count< 2) {
  28.         printf("Underflow\n");
  29.     } else {
  30.         int x = stack[top--];
  31.         int y = stack[top--];
  32.         if (count< MAX_SIZE ) {
  33.             stack[++top] = y;
  34.         }
  35.     }
  36. }
  37.  
  38. void top_element()
  39. {
  40.     if (top== -1) {
  41.         printf("Empty\n");
  42.     } else {
  43.         printf("%d\n", stack[top]);
  44.     }
  45. }
  46.  
  47. int main() {
  48.    stack;
  49.     top = -1;
  50.  
  51.     int n;
  52.     scanf("%d", &n);
  53.  
  54.     for (int i = 0; i < n; i++) {
  55.         int command;
  56.         scanf("%d", &command);
  57.  
  58.         if (command == 1) {
  59.             int x, y;
  60.             scanf("%d %d", &x, &y);
  61.             push( x, y);
  62.         } else if (command == 2) {
  63.             pop();
  64.         } else if (command == 3) {
  65.             top_element();
  66.         }
  67.     }
  68.  
  69.     return 0;
  70. }
Success #stdin #stdout 0s 5276KB
comments (?)
stdin
copy 
3
1 2 3
2
3
stdout
copy 
Pushed
Underflow
3
https://ideone.com/wxxeUj
language:
C++ (gcc 8.3)
created:
26 days ago
visibility:
public

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