随笔仅作学习记录,请辩证参考!!!
图片来源:https://www.bilibili.com/video/BV1A84y1G7xA/?spm_id_from=333.337.search-card.all.click&vd_source=57c5c9efc98292f24b24953468d896e2
int到double也是类型收窄(类型收窄指的是导致数据内容发生变化或者精度丢失的隐式类型转换):
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