0_0_7210275_17179.c:10: error: syntax error before '&' token
0_0_7210275_17179.c:11: error: redefinition of 'change'
0_0_7210275_17179.c:4: error: previous definition of 'change' was here
0_0_7210275_17179.c: In function `change':
0_0_7210275_17179.c:11: error: number of arguments doesn't match prototype
0_0_7210275_17179.c:4: error: prototype declaration
0_0_7210275_17179.c:13: error: `a' undeclared (first use in this function)
0_0_7210275_17179.c:13: error: (Each undeclared identifier is reported only once
0_0_7210275_17179.c:13: error: for each function it appears in.)
0_0_7210275_17179.c:14: error: `b' undeclared (first use in this function)
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