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  1. #include <stdio.h>
  2.  
  3. #define MAX 100
  4.  
  5. int stack[MAX];
  6. int sp = 0;
  7.  
  8. /* push関数 */
  9. int push(int data) {
  10.     printf("[push開始] sp = %d\n", sp);
  11.  
  12.     if (sp >= MAX) {
  13.         return -1;   // スタック満杯
  14.     }
  15.  
  16.     stack[sp] = data;
  17.     sp++;
  18.  
  19.     return 0;
  20. }
  21.  
  22. /* pop関数 */
  23. int pop(int *data) {
  24.     printf("[pop開始] sp = %d\n", sp);
  25.  
  26.     if (sp <= 0) {
  27.         return -1;   // スタック空
  28.     }
  29.  
  30.     sp--;
  31.     *data = stack[sp];
  32.  
  33.     return 0;
  34. }
  35.  
  36. /* スタック内容表示関数 */
  37. void printStack() {
  38.     int i;
  39.  
  40.     printf("Stack = [ ");
  41.     for (i = 0; i < sp; i++) {
  42.         printf("%d ", stack[i]);
  43.     }
  44.     printf("]\n");
  45. }
  46.  
  47. int main() {
  48.     int x;
  49.  
  50.     push(10);
  51.     push(20);
  52.     push(30);
  53.  
  54.     printStack();
  55.  
  56.     pop(&x);
  57.     printf("popした値 = %d\n", x);
  58.  
  59.     printStack();
  60.  
  61.     return 0;
  62. }
Success #stdin #stdout 0s 5320KB
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Standard input is empty
stdout
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[push開始] sp = 0
[push開始] sp = 1
[push開始] sp = 2
Stack = [ 10 20 30 ]
[pop開始] sp = 3
popした値 = 30
Stack = [ 10 20 ]
https://ideone.com/91lPkn
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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