25 lines
653 B
C
25 lines
653 B
C
#include <stdio.h>
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// 这种方式只能交换指针指向的值，不能交换指针本身，而且无法改变实参的值
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void swap(int *piA, int *piB)
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{
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printf("first iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", piA, piB, *piA, *piB);
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int *piC;
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piC = piA;
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piA = piB;
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piB = piC;
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printf("after iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", piA, piB, *piA, *piB);
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}
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int main()
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{
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int iA = 100, iB = 200;
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printf("main first iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", &iA, &iB, iA, iB);
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int *piA = &iA, *piB = &iB;
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swap(piA, piB);
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printf("main after iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", &iA, &iB, iA, iB);
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return 0;
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} |