0_0_5203655_18991.c:21: error: redefinition of 'main'
0_0_5203655_18991.c:5: error: previous definition of 'main' was here
0_0_5203655_18991.c: In function `main':
0_0_5203655_18991.c:27: error: syntax error before '/' token
0_0_5203655_18991.c: In function `shift':
0_0_5203655_18991.c:42: error: syntax error before '/' token
0_0_5203655_18991.c: At top level:
0_0_5203655_18991.c:48: error: syntax error before "else"
0_0_5203655_18991.c:52: error: `sign' undeclared here (not in a function)
0_0_5203655_18991.c:52: error: syntax error before '/' token
0_0_5203655_18991.c:54: error: syntax error before '!=' token
0_0_5203655_18991.c:58: error: `j' undeclared here (not in a function)
0_0_5203655_18991.c:59: error: syntax error before '++' token
0_0_5203655_18991.c:63: error: `len' undeclared here (not in a function)
0_0_5203655_18991.c:63: error: syntax error before '!=' token
0_0_5203655_18991.c:68: error: syntax error before '}' token
0_0_5203655_18991.c:58: error: storage size of `num' isn't known
0_0_5203655_18991.c:67: error: storage size of `num' isn't known
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