31 lines
714 B
C
31 lines
714 B
C
// 浅拷贝
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct POS
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{
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int *x;
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int *y;
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};
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int main()
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{
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struct POS *p1 = malloc(sizeof(struct POS));
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p1->x = (int *)malloc(sizeof(int));
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p1->y = (int *)malloc(sizeof(int));
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*(p1->x) = 20;
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*(p1->y) = 30;
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printf("point1 x=%d,y=%d\n", *(p1->x), *(p1->y));
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struct POS *p2 = malloc(sizeof(struct POS));
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memcpy(p2, p1, sizeof(struct POS)); // 浅拷贝,只拷贝了结构体本身，没有拷贝结构体成员
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*(p2->x) = 200;
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printf("point2 x=%d,y=%d\n", *(p2->x), *(p2->y));
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printf("point1 x=%d,y=%d\n", *(p1->x), *(p1->y));
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free(p1->x);
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free(p1->y);
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free(p1);
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free(p2);
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return 0;
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} |