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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.   int a, b, temp;
  5.     int *p1, *p2;
  6.     printf("請輸入 a 的值："); 
  7.     scanf("%d", &a);
  8.     printf("請輸入 b 的值：");
  9.     scanf("%d", &b);
  10.  
  11.     p1 = &a;
  12.     p2 = &b;
  13.  
  14.     if(*p1 < *p2){
  15.       temp = *p1;
  16.       *p1 = *p2;
  17.       *p2 = temp;
  18.     }
  19.     printf("*p1的值：%d\n", *p1);
  20.     printf("*p2的值：%d\n", *p2);
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0s 9424KB
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stdout
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請輸入 a 的值：請輸入 b 的值：*p1的值：3
*p2的值：0
https://ideone.com/pOehaO
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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