PTA做题时出现的错误，用if括起来就没有了。
if(scanf("%d",&a)){};其实并不是这里有问题，如果你的输出有问题，他就会鸡蛋里挑骨头的先显示这个错误。
a.c:5:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wun
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