0_0_2589675_19153.c:3: error: syntax error before '&' token
0_0_2589675_19153.c: In function `swap1':
0_0_2589675_19153.c:6: error: `a' undeclared (first use in this function)
0_0_2589675_19153.c:6: error: (Each undeclared identifier is reported only once
0_0_2589675_19153.c:6: error: for each function it appears in.)
0_0_2589675_19153.c:6: error: `b' undeclared (first use in this function)
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