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#include <stdio.h>
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#define swap(T, x, y) \
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do { \
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T temp; \
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temp = x, x = y, y = temp; \
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} while (0)
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/* swap x and y */
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int main()
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{
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int x, y;
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x = -1, y = 1;
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printf("x = %d, y = %d\n", x, y);
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swap(int, x, y);
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printf("x = %d, y = %d\n", x, y);
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return 0;
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}
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