Here the first time enter illegal complains, but a formula to calculate mistyped later would not be an error, but the result of the output on a formula I in defau lt and judge whether the second number is equal to 0 two added goto to locate or not, this is why
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Lf int rt=the scanf (" % % c % lf ", & amp; A, & amp; C., & amp; B);//test under the scanf return value, when 3