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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. count++;
  20.         stack[++top] = y;
  21. count++;
  22.         printf("Pushed\n");
  23.     } else {
  24.         printf("Overflow\n");
  25.     }
  26. }
  27.  
  28. void pop() {
  29.     if (count< 2) {
  30.         printf("Underflow\n");
  31.     } else {
  32.         int x = stack[top--];
  33. count--;
  34.         int y = stack[top--];
  35. count--;
  36. int sum=x+y;
  37.  
  38.         if (count< MAX_SIZE ) {
  39.             stack[++top] = sum;
  40.         }
  41.     }
  42. }
  43.  
  44. void top_element()
  45. {
  46.     if (top== -1) {
  47.         printf("Empty\n");
  48.     } else {
  49.         printf("%d\n", stack[top]);
  50.     }
  51. }
  52.  
  53. int main() {
  54.    stack;
  55.     top = -1;
  56.  
  57.     int n;
  58.     scanf("%d", &n);
  59.  
  60.     for (int i = 0; i < n; i++) {
  61.         int command;
  62.         scanf("%d", &command);
  63.  
  64.         if (command == 1) {
  65.             int x, y;
  66.             scanf("%d %d", &x, &y);
  67.             push( x, y);
  68.         } else if (command == 2) {
  69.             pop();
  70.         } else if (command == 3) {
  71.             top_element();
  72.         }
  73.     }
  74.  
  75.     return 0;
  76. }
Success #stdin #stdout 0s 5276KB
comments (?)
stdin
copy 
3
2
1 2 3
3
stdout
copy 
Underflow
Pushed
3
https://ideone.com/1o8nRj
language:
C++ (gcc 8.3)
created:
26 days ago
visibility:
public

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