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  1. #include <stdio.h>
  2.  
  3. #define STACK_SIZE 100
  4. int stack[STACK_SIZE];
  5. int sp=0; 
  6.  
  7. int push(int x){
  8.     printf("push> sp= %d\n", sp);  
  9.  
  10.     if(sp == STACK_SIZE)
  11.         return -1;
  12.     stack[sp] = x;
  13.     sp++;
  14.     return 1;
  15. }
  16.  
  17. int pop(void){
  18.     printf("pop> sp= %d\n", sp);   
  19.  
  20.     if(sp == 0)
  21.         return -1;
  22.     sp--;
  23.     return stack[sp];
  24. }
  25.  
  26. void printStack(void){
  27.     printf("printStack> ");
  28.     for(int i = 0; i < sp; i++){
  29.         printf("%d ", stack[i]);
  30.     }
  31.     printf("\n");
  32. }
  33.  
  34. int main() {
  35.  
  36.     push(1);
  37.     push(2);
  38.     push(3);
  39.  
  40.     printStack();   
  41.  
  42.     printf("%d\n", pop());
  43.     printf("%d\n", pop());
  44.     printf("%d\n", pop());
  45.     printf("%d\n", pop());
  46.  
  47.     return 0;
  48. }
Success #stdin #stdout 0s 5316KB
comments (?)
stdin
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Standard input is empty
stdout
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push> sp= 0
push> sp= 1
push> sp= 2
printStack> 1 2 3 
pop> sp= 3
3
pop> sp= 2
2
pop> sp= 1
1
pop> sp= 0
-1
https://ideone.com/2oQPCP
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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