整數係自然數(1、2、3...)、佢個哩嗰負值(-1、-2、-3...)同到0嗰統稱,係實數嗰一類。整數有無限隻,向數線嗰正負兩頭延伸。整數到集合裡頭會用 Z } 或者粗體Z字來表示。到加、減同到乘法裡頭。整數集附上加法同乘法係一隻環,即係任何一隻整數加、減或者乘別隻整數,結果都會係整數。
到電腦裡頭,整數好多時間係一隻資料型別(datatype)。但係現實裡頭嗰整數有無限可能,但係電腦裡頭嗰整數標記範圍就有限,因為任何電腦嗰處理能力都有極限。到C語言之類嗰電腦語言,整數型別用int
表示,而另一滴子語言像Visual Basic就會用英文字integer 。
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