SIGFPE—算术异常、整数被零除或浮点异常。
SIGFPE - Arithmetic exception, integer divided by 0, or floating-point exception.
gdb指出在程序第7行发生一个算术异常，通常它会打印这一行以及wib函数的自变量值。
Gdb indicates that the program gets an arithmetic exception at line 7 and usefully prints out the line and the values of the arguments to the wib function.
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