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03_Swift2基础之基本数据类型

发布时间:2016-05-01 16:00:12
1. 整数 整数就是没有小数部分的数字,比如`42`和`-23`。整数可以是`有符号`(正、负、零)或者`无符号`(正、零)。 Swift 提供了8,16,32和64位的有符号和无符号整数类型。这些整数类型和 C语言的命名方式很像,比如8位无符号整数类型是`UInt8`,32位有 ...

1. 整数

 整数就是没有小数部分的数字,比如`42`和`-23`。整数可以是`有符号`(正、负、零)或者`无符号`(正、零)。

 Swift 提供了8,16,32和64位的有符号和无符号整数类型。这些整数类型和 C语言的命名方式很像,比如8位无符号整数类型是`UInt8`,32位有符号整数类型是`Int32`。就像 Swift 的其他类型一样,整数类型采用大写命名法。

 1> 整数范围

  你可以访问不同整数类型的`min`和`max`属性来获取对应类型的最大值和最小值:

     let minValue = UInt8.min  // minValue 为 0,是 UInt8 类型的最小值

     let maxValue = UInt8.max  // maxValue 为 255,是 UInt8 类型的最大值

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5cn1SfuJs/CHnLH0OTeDYko/OP1kZeig8gojl6/mxvjPtKtBpwYdEiOZ9RBUKefcosBQxC3LITGmEc6PeQOnlpYijJQsPEgrIMjrcXIuQAxsR8t8pZOHQxBe3dCh4C3c9Py7YuGsych7xhvfWeXDnOE4KJWPx5Jg0/PniMJyLacc/7GucyP2Ys4ef9aqJi0YBuR3hJoxFVnm6QU2uRy6UN38SxX1ccJN7dpIevPkc6YWj2VKytMuEBwhVCU9w6kdfww3aAcvebg96T9uBE1OSkK9nSqms4d0lexc6bs1Bxsjh2LZoA+JnnsTVAAfYHeVIuA8yXxqOHHl5cnF7Egny3liDGuMY3ZLFwN0LP9pk/hlalL/PRGvV36e6ui2mpFlQSgtPh3VbK9POEGAI1BUC/vs+R9S8WaS+K7I+eQeNP3gOfnQCRw8rbki7C+Ryc4630JwidJrZX/Dg0AQKFbnVvHYv5MeyLAiLSelw3Z3O1+084g3cahJLBDSbZqFwlgw56DLnwZdmmGu6foiCEG/rasQcG3o+z2tCfdS1pWhDBKjtOhtHRw9HVcrL6LJ1AH6d2x/BaycjuMwVTqkcAQah8MUPkN63J01+KUKrLUvQ4icaL/wiH/n/9z1yOBIoOYfHPkrka8iNaWW1DQUdaR2iXRoan0mD/dk0Xq7KyHvlQro+RufEj4102NA82QvkIg36MQnNzqwnY6OZMAnGSEq60KLJzq/hTrNaO+/eiUtzl9Cawlg+U3pmseFIS/4wp1UbW+2SKvHdljwgPsUBODtiMp+iI6IOv7Ae7lEv4TRtwSkMYGphl1sA20YmhWvp8m9FgrV0z0wNQ4AhUA8QUF5aLhIgLR+YvQrpgZfBdaY2N3Nhb3E8kPI4i8rZtPFlCF/wGvz0VhVZO7ZtsGPNdShVefDLpwl4oaRZnG6vsy1C5zFtaawtGfvmvkHLq2ipAG+9tKExszZ65W6p53kSvPpyEs7X5OHbbRhOvOONJlfLELB1ORyJZ7VOJxD1o4beI1Fqp4Gi8nEU9w+kE2zyEfLLct4q0zo1RVHUSGh6jhEIkFrimbGVd6dyY2qnaXxTHhR5uXArb0UzWym9/CQ6TuvP6xFkBiEvkIhPHzhLjdyxo/sLnsnyS2ixhCNELS9xdeDncL+ajmYHE9F12wHs7tNSX9IQUeBC4o8oCp+Pzl98jFBaEG8394pZuwzyFKNjgWyMEuQXvrA/vxJtSZdZ2D0cXYwmxvTBqQXj+bZzzwa1GRgJ1iaaTBdDgCFwzwhoQvvjWo9LqOz/b5wnlxrKhQ4z74MfaAcVy12T75aXeXeovBLlpR9ppudBsrw+hCrrY7hLBGqrRcR/otCEyNGHFpT/ESqRggOREWkot+c7VR2NS5mHCjTbJ0xqCf3oZTT1JrckP4tOkiyDzpH0qWmjjrjp2N/HQJ7cWTe5/hp0+EIYaKlyCyfy3gZfPUlLOmjtoiGqj+X1fk8fL3x0PO3GkggNjTXqAy1V2LEug4g8DN1GJ1P+G9DQ2sTflpyFg06QuuPmQ65SfQmKcBNj4nGuW4IwS1MXhACeBCUZB5wevZQWsUfDdckIhEf8inTJvJNExPf8mCTs+cQb0duUNO5qTMyCSAXaT2uGwKvhNPEmnSdBjZMlh2g+Ktt+hINf9tW7S6tsSxA2pRdZgstxlLMEKfiuG0afry+/ckDQX7uvlj792q2BaWMIMAQYAhYR8MDJt2RWAHXa3BIp3+8no7u75cliiixzd6gmMAaFXb/CybefQcgkGQkSGf0xkab/04L2JpOTULjke1wWVlhZbI1xYgV1zF2h9XelNpXC7haRiFGgzTturufH+mw7ms/60AW/gF/XvUDLCWhh+/ID+HP4FmT6EmGQFdqJs0K7bsXWIVGw1S8GNyg3ImVaexr26wY4G60vUNKCcWlXlgN4dC0ZXBoNpRkmpNhovHHppYEoMCJC2bmU4sQYQ60Usw1G6qdfoffksfC8RhN9AhRQqIwk9BdlreOgWjYRrY8/hmMd/fTpQsQBhY+MJUfrdboMJ6bvgIzY5iYywqVO4YLCAOnhhEujZSFk6bt6B6GgEZ1FW1kAfw2Z0v4jccvLEWEWtTxYIiPBB8OPlWYIMARqGQGbq8fMPZ5SHZw71F+6EN/tW+Lg25z7znDMtV7CMxr7P5lNe3ROQNsp3+IWuT/5OSp6AWsRDyLQH61lCuncMoMX4qy6+zijTFl8Cu7HZuHOgERk8ssxHFBFVqjN+qfw9HpT9YNw6vv5uMpZqVKgXVr8139czdjmNpp4Qg8GZoF2Z3mOSFCvi5sYUwk7apSGW7dHi9AtuSk1oS9g55JnoKZNAkDrEd0ILGFTE+MKfPZ9B5/MbVDdnmacIV5d7fdvXO1nyOKWUDz9SzscXTS+2ok3nHuWaxeHUQBZ/R2WC/dW1SOALFhuHWLtB0aCtY8p08gQYAjcJwJcB5g/eQuO6l2Xxor8qWOMotmh1oKlDlvdejjODvoJbXeU0PZnVLK2etLKcr7DvmPFauXaqFNw5ENdu9EkFUrwH46CR4O5LH2wJeutwnTAi3d93tDLGCKcRRlGm1cnYw8ROzfiV30ga6tkCrq9MKV6McrlCZCTEnEyI0ua8Rk5j3MVj8T5uGBO0hAsYlsB36OCBV9ukl9ler9kvXOfoc0dBXJonNIu4C0yC5viMjemS2tAuY/PrD2G2u8rxkjwvmBjhRgCDIE6Q4CzVCwGLTzJ+rA8O9RiAX3i5SE/4PozRErcRBBdGRTiuKFJn6yXtxgR99QUtgyroNmc3/GzUQtCTU3TClqCQbMZaTcWhytZvCpnendz9yVeKQR5MlH12ACceS4CNiabg9vm55AbkdbO+fuR5UPkcekCWYHm42k6OmTcNZdUu91E40sX4cHdl0mwoQUieaG0tIxPF5YwFA6KJdcp1a+5AN9ty01K0CW35lFVwZ9+0WTnCt4CVZlsbBuyKpm31FVvvoZciSh5j/BV+KZfRGmAI52UIaom8nfI3iFMWurkJbaFy+NcoOsRtnA+aFtoWaiAvfcg3Lm4Dl1WNCIXL5d1Co1TqdGl6fwaUOF+ZEUeMGqBBKugKSH/cjWKlWQq1zYbV1OdmKVFafYtlBYJ/ncbF2f4hHoKU6LvXphJMATuEYEC/LF2LS7+SVO3H3sZ8dEBJuVUyNixCr9t3oo/+cdvVzSPfgo9nnsWIb7SY20lTq1djHO3xdn2Jhr4Sw3NJQ/qjgF9aVzIUv4/MY17zLcQbHN/RsKYROrwyQqw5A6VlbHhyE1VaY4pnewR9684Y7dihKWtvGTKTKIhy55Em200PmUUhuO60SxMyiw/i65jnjKScv1vL3STp2x7DnGWvJiiDL8xOG2k0XmysR65Cj5Om4W3mSxM4DHLowQ7cYNxmztX6eol/D6EJtHwgnnoVOqIMhdjCnD74wt0k28+TuOiVx8L5ktwLy5nvqVt36jhbu/hRLwhvTQojHK3we8/sWSdWg6qThF6ErQRbVfH3R/zxGaphOVR4YdgCXLbpu1OvmapTfq0ppPiEdHaMAirz6hRpBzZGy+hmGZotRgUBlep/7CgQ33+ItJmXKJT6E2DA1pMikbL1uRAZoEh8IAIaGgSw/JR/bH5gqAo0qefMQlSR7p2SCxWivlSdaePbsfmeWPxyoqTGBjFdQFqXFn9sZmcJK9/b+WK3kSC8mkB+rx/YsTeDUURg8y2IdN5heF21+G0XybXLbrjxjP9DbtGGeGkQGHcWJJqp+9s9dn2gbhKW6t56DsRb/z59FPmcvoC5pFrT82At/IYbwDYasha8gxD1hN9kG/ad9mH4MRHm8l+MyYYc42WU2xood0NTqdtW9ohZg8cJKvKsrj1VHLF5otd4/V+61DUm06D0Ev74djbH+uvpIgq7FlcGd5CsD3tPJEb3R25sslEOo82KPXvitIxI8mmNYTCmHdw9KNu8ColA8pksb4NnZxR2SgcV0MN9Fju3xlV/u1wfMZ45N5r902/v64fTSRXsqxBhibcd+x/fs0s/n/y0trsdOycekWeZBY37O1plnXvCeW52P3WCfpQlGi/IB5+1oDQywmqHaN8aZczFfJTpW+zLdrMfgJBjR6+bXrvN8sk6wMChTdvwMXN0qR0La7smIvRb880amb05BQ61b2dmKbFH18+ganfCnt8Dp29GT1jQqC9loofP3od23liTKCzA5fT0Ula5KTtR77RlHpOjR0cHFXYNmw49nCX/b7B+pnGp81zySwwBBgCDw8Bs0cVbhu0XgtbkTvUhvzVN3BgzAl66nJA5Jfd6bijKlRpbeiorVogHHvB062heuxMn6Rk91+adk3/9BJIG3eHixt3axIysG9qFvn4dcjefZO2XmssK8WiDIF7R0B9YameACPfmIWedEjoV98eMlZQmY5fRQJ8ZSlZfNHiU61XPyStTUFlx15EbNtx4XIRwtrThsJRPfiF38ZK6Kr8CDaKiWPp4NQH9aeY6WcJDAGGQI0QMCNBrrQN7U8n0BwRoaiOIz4bW+7fRH95IbL35wONfRHQyhY52y8iP7OCzuiiST2dmqFNAq310Bepwq1j2SiiJ2TbkgLRvXkHOb9loVS0BGmDAfh0CqZDRoWa9WcG0v4OLWQnVyiDQxAYmIXs6j23+potRrQFOPnbQdq1wQOKohNI3XMW9s27o99rfVG883uk0HWFU1sMnpCEYNkm4Opbl5F54hDOp+fg9o1cmnjsCO+WEWgXm4CIEB9ZVUU4s3MvuGFMjzbkQm5m7PhSXzmGtHPcWhpfRD4RA1kVMh0sWucIiO6moXP2YEjvNsjZeNRClXY0+YALgxDVweDW4ZPswxBF08H3bKEr8zkMvIj0cmrhRDpDkAJZgY+3ogVRLDAEGAJ/KQIWSbAmLdJcvYaM1VxHnqU/akkqr7p4Gnmn1Yh/t6XoHdcg5+sMOopRHuhoxtXGaSW+TdAxQtiJwJ6OTuIWUHLzurgpMUIqV57mTt3m3inYSVQtXN7za2U2ViUNp7lH8rAWG+fIr4Fdl+2xbuWbwthN5UlM7dzNpIxB/qlZ+zD6ufZiggIFvwzHzE3c5RDMO7UIoVK/V3kWi3vGYyuX1WUO1vWJ4WIs/AUIOIY8i4U7X4K/eKgtN3vOLNi3QVL6DSSZZVBCeQbSOAKk4ORQDQvm78Zi0ZocO7Kv7OFQKMteGQIMgYePwH2yh6yhCmMV3rTVTacpkfBrKZqMZy4hJ0+aa6pE8Ltt0eZ/I9F2uPQ0rURgYltE/m9btKX/NiMjEdrCQHWu4ZJldQvHV2ZBXUkuWVqfk/PDceSJw4KNO3rKGlSDqMJOvyh3yJfb8OX8f+sLtxu1GPM2LAZPTYfpAElpCFLcaaH5gPF4Z9FmzNvxO77ZvAHDBrTly259rxsOXJdGsl0QN+t3PMvnrMXoD1aKA/oVtO3QYwIB4lV8s+hVNjlCj/xfELH30RNgzWtXYe8szhXKBdpuqpn0lMMnyF5oTHHlNGRzKZwV2KKaMQBZKRZlCDAE6haBB7YE5c3zHtkVnWKEmTvekxxRnniU352hrIgerf04YrOBe0SQsF+ezh7Zy/PIJWqDxp2D4G2lT7Dxa4luk+5g34wrdPgujQPSvzw0fftxhAXf/20I03D7IjYhBqG2bjQe9B/sArlAXx2MUO8KxPQCUlN+QVZ2GVpzh+Q6R+Dfh67AvbHgHBPa0grBX3SCMqMZlpwn+bQsxDZtJWQpWuGVXcuxsedwYNNbWNy7A56x24CZq4Xsd7YmI9havym/URavlwikrxiFz38Qmjb+5ynwNx0uEFuty9+JZcwKrJefIWvUPxuB+2cPM9ycEfSIbOqqrSu8AmmTAhqz01VIlqCskNaQprOyPkiQ1qKQzvyzFkov34a2g3QIrjWpu6S3joYnR8IqrWipBcODN0Yli447E1KKOxAB0mnVqlxcTr+AgpJyKOzsYGd3Bxq6XxAJqguNpwUqmw3Ad/PfwmtJC7A1SbIAgZ6zDqFXmPE44V1ayrLrEQKZa5Mw6dPtfIv6zzmC7latOy3SvvsU2ZwkswJ5vNgLQ6C+IFB7JBjoBQ8r1lzxBdp8toM486WGd166/3ecXlfEl3Ijl2OHhCY090CD/N0n+fSSTWdx2MmZLDnvGmqWiQe6CUdg2TtaXehpkC7C4UVTMW3mUkOSSczRRbAv5cn+fT7B+y8uwHTRAkSXBfjf5wQXqlyOxf8eCFz55V2Mm7aeb2zcRyl4vXew1Ybrcn9F8vJzfP54NhZoFSeWwRD4KxCoPRI0Nn5q6V40+HOHQICICkP0s0HibFUFmvSNgTZnB86l6qBKoeNMiAQNs1Dvs3pFEzQn9ydSrJfP3SYjwC6vYvSQHvD1EGrO/ukTLCFSVpfdAxi0VZAVz5n1yllOvUAgd/d0jJ6wgm9L3Edb8c4QaS2hpeaRFbjwdSGDrMAYq9aipbIsjSHAEKhrBGqPBB+gpVWSp7EaHY60wZzxFBw6cDKcxuVSbwEFpXQwJu3YLmMV3a2zSKVToUHHi9CGBQiITkAouTEfLJThzE+CBRhDR7S8P6K7jMi0KPvpBavqc7d9YLACOamUt/DVhg6YwKxBq5jVx4ybB77AyKS5fNOiJ3MEGFVtM3VXyQqUxgyZFVgtViyTIfBXIHAXEpTRjoxgaqWhRFrCqGAFbudraSG+5aZIw4W6okqzavVrCGkZhYNJ+zR5+zF93ER9mcQNV2qBBPXq0Km7yZ6PqhPYxy+FMMhIMc2Vdfx4IHfdc9ZODHbegFE0PrjrvcfQNuI6nmLjghJU9fr9dtq3SBwh7irz/DcY+1J7qMulacNi021pcy9aZyuEShz57nUh+jzNNGZWoIgLe2MI1B8EZCwnNUoLVV4JSm+WQ5Vbyq/N4+iqPLcM6ptlKM0r008RkUrc17uTO7zE1Q8FR3L4pQ+cHsN0Ge6KdpMRjTfN3nSkn+B2zxWC+nwGzm6tEC4c7c3XKCuMByhp7kotBC3u0PAmF35et1PcApYuVJexaXw8Uvkck5fKC1jWU+wIaT3gqOc6IbjP+3hngCA376l3cMmkHzXRwC4fOgLihyyvt/IUvhk2xZDywyi8FNkUQzq1MPpP/sGwwbIm6xfMkKzA13o/uLveUDuLMQQYArWEgPTIqlfHbaB9IPm6/lqIaJAxdb9+MbwfbV/WXrZ7i4mw/lKy4vQJRhEH+HRU4nqKhpY+nKOlD8LEAU7EsDepAiEvhyJryiVK1eHanIO4RlafI1GzusCgPTgx9D63quW2OqZgoc+TPLTcAn1D8EDkkFeBw0txeelwDF7aFu26eKH08H5cNgjJYmU48Mmj4jZZfTF7gbQe0AW9PtmHE5u60XIMWj84vjvW/XcoWysoQ+6vjCo9m/HVOxoNMks7xlTfMm+l4Wnr0m5h3DB4OFmBQcYPZdVrYbkMAYbAw0LAjARtTCwoSw1xcDAYkDbSYnlHQ5pQxgb27uSjvKaDnZX9wPyGdoXG7jgy95ZCww3qiUHu2bQJaIkeU+1w4utzKCwggYIKcRkDxX3cEPZmFIKDjXorUYtxmuUd3RVEqBRcjWW5s64EYBRwEq1VJ/FQzMD+yZhRCEz6mBsbPItTh4Xqek5cgx6u2/HBlKVwFI8nUWes048DJq6Ziwh3QZZ/dW6PUZvnYFf/t/nxwW2/J2DQo9LGADI5Fn3oCPj3/gSb0z8xrre6HWOMJfVX4YkbsTlRf8kiDAGGQD1EwOwUiXrYRn2TNIXkklUJtpmNsyNcPR90ootedY0jOlUB8mlCDogcnTz84e5s9jxRY52sQN0iYP0Uibqtl2lnCDAE6i8Cf6ueW+npAuV97pBW2x+BrTNttUX/LDAEGAIMAYbA3xcBUx/m3/dOWMsZAgwBhgBDgCFQQwQYCdYQMCbOEGAIMAQYAg0HAUaCDeezZHfCEGAIMAQYAjVEgJFgDQFj4gwBhgBDgCHQcBBgJNhwPkt2JwwBhgBDgCFQQwQYCdYQMCbOEGAIMAQYAg0HAUaCDeezZHfCEGAIMAQYAjVEgJFgDQFj4gwBhgBDgCHQcBBgJNhwPkt2JwwBhgBDgCFQQwQYCdYQMCbOEGAIMAQYAg0HAUaCDeezZHfCEGAIMAQYAjVEgJFgDQFj4gwBhgBDgCHQcBBgJNhwPkt2JwwBhgBDgCFQQwQYCdYQMCbOEGAIMAQYAg0HAUaCDeezZHfCEGAIMAQYAjVEgJFgDQFj4gwBhgBDgCHQcBBgJNhwPkt2JwwBhgBDgCFQQwQYCdYQMCbOEGAIMAQYAg0HAUaCDeezZHfCEGAIMAQYAjVEgJFgDQFj4gwBhgBDgCHQcBBgJNhwPkt2JwwBhgBDgCFQQwQYCdYQMCbOEGAIMAQYAg0HAUaCDeezZHfCEGAIMAQYAjVEgJFgDQFj4gwBhgBDgCHQcBBgJNhwPkt2JwwBhgBDgCFQQwQYCdYQMCbOEGAIMAQYAg0HAUaCDeezZHfCEGAIMAQYAjVEgJFgDQFj4gwBhgBDgCHQcBBgJNhwPkt2JwwBhgBDgCFQQwQYCdYQMCbOEGAIMAQYAg0HAYX5rVRBU6JBlXmGPkXp5oC/jD0rtdDoqmBjq4DC/i6tqKzArYsFUFcAChc7OHq4wtXP6a9rOyGou7EXK+ZthCboabwy4gko9aiyyN8BAXVuGvauWY39JzOF5rqEIOrJZxDfJxbutpbuQIWMHavw2+at+LOMy3dF8+in0OO5ZxHiay8WqMSptYtx7jZgZ+0LoakEgrpjQN8oGKrR4sqBldiweCmyi0iVhyeCWz+BuIHP4ZFWfqJu+ZsWOUc2Y9ePPyHjRimf4RTcCbFPPo/Y6JYyvfIyLM4QaNgI/M+vmcX/T36LmktnsDv5mjzJLN50UjwiWlv7tZqJW0koR/bGSygut0eLQWFwlfoDK9JVJYW4vCUdl1JKBAmfQPT4LMIqiahOnEHqnGvQmepr2QI93g+zWs5UvLav1Wf/i4H9JwJdZmLdyjfhUtsVMH1WESi8eQMubu5W8++WcfPAF0gcMdOK2DB8eewzhDjJsisvYu2QWKy8IEuTRV9ZcRIDoziyKsKWZ8LwrRU5fZFWyVj10xvid6YIe6c+g89/OKfPlkfiPtqKd4ZEyZKKsHNiGL7aIkuSR/t9hVUzX2DfRzkmLP6PQMDMErRR3MW6IlhszErdB1blxbi86To0REeNnyUStKqiHBcXHkNWqspYwtH4Un5VmpqGQwvz9UmOLZ2BwgqoC4gS/6ys1srVF6qriOIubF9X9TK9D4bA7QOYIxJgcL+JeHPkSwjyAa4f3oD5b3+MbKzAuFm9sHFqgmhRafHHgjf0BDh09mb0jAmB9loqfvzodWwnwls27D20PbwcYW4u6PjBGkxVmzbRDg6OKmwbNhx7uKwwb/3DW/o3r+oJMGHyGjzfN5K4NBP7F07Esi3nsGfaUwjvmIU+rei7TyF3R7KeAOPGL8bz/WLoN1eIs1vmYMbn64EtY/F9ty5I6hvMy7MXhsA/BQEzOlMEh6PXwlZEFDawqbyBA2NOQA0HRH7ZHX5uVajS2tzdDXkv6NkrYUdyGqrHrjpeILLMlQjQmaxPlUbQbtZhiJVW3sRJiQCdPdA++VH4eQq3qSVrMj+rSt+R3Esza1vGMexV/JwxjNQqmPuptsGtQ3230/fiNK9/DKbOfAdeYl1hvZPwwfwiJCbNBbLz6LcCwZqqTMev3wpW2itLyeKLFt2TXv2QtDYFlR17EbFtx4XLRQhr74GAqB4IsNT+8iPYKKaPTUwQvrslR7By3iE+NWH2HiKuNoKElw8GzvwJdjfIqjwKLPjlOJFgLOVV4vKhFbxM5OgNeCeRS+OCDx5LnI9kzZ+YQvoyLuRARyRocLcKUuyVIdCQETAjQe5mbewV4rgZEaF499z4m40t928CR3khsveT1dXYFwGtbJGz/SLyMyvADWG4dmqGNgkBMtKpwq1j2SiinsK2pACCbXcHOb9lodRJ0Ku7Qz/NTsFwdxNr5uqkn2XTxEi0etwf6u0HcXi16BI1aQp3qT59VdRLxP1pDBG3QUjh5okmHQzXNY5pC3Dyt4NQO3lAUXQCqXvOwr55d/R7rS+Kd36PFLqucGqLwROSEOwuh7YI5/elooynfa5WuknHEHR8tJV5h6O6jMM7jwH+nfBIuAJ/bF6FU2dzyW0MNI8bgr79Y1CNEVzjW2IF7g0BRxqPe2uyLxzDn9QToFTSvVmIGBUf0PgrO3jw74MQ1cFkfM4+DFH9gD2ca5J7EqwmnCLL7giX3+8bPC5ZdYd/Fgi51UT8SyJAvQ4P9Jubho4Fati6NBFTtbgjPjSGRYbqJaVIoxCu/YeIw/P54QPTn7gkx94ZAg0RAXlPfV/3p7l6DRmrr1PZLGSYaFBdPI2802rEv9uS7B4uaJDzdQbyjOR0yFttnFbi2wQdIxwEKfvGiF3WW1+itNxslE+fB7Jfb6Te4q9tyfXUhAhQU1KOO5U0zUehhLMnWZIPEiqzsSppOE4Z6ViLjXOMErDrsr3xeJ/qEsa9+oKxUGsaE/ylldkYjDp7O6aNm2gsK11tWoolR5djU/IA2YOFlMne6xIBx6BY9BkmWVDymgqw64uxQkJwkOEBxb4NktJvIEkuKsXLM5Amjs05OVTDgvm7sVi0JseO7Kv/zMsLr/Ca4l5+Ei7lF7F3wxacOZNJ9p4jfIIjEd13EMJayO1KZ4R0GUQuz/VYP+IzRB+YgTAv4Repu52GH99ewetLiH9EX4fUVPbOEGjoCDwwCcJkDNF7cFs0D7NBztp05F0kwjpzCTl5IQj24yw7JYLfbQvPCrLuSm7i7HKODpUITGwJDzJvuBmpVXds4NlCJMAao69Feb5Akt7BlTg5fYfQBklPoDfaj+kEv0aSfStl3OO7wg7CCAsw5Mtt6KLch3FJ/+ELtxu1GG88Aax67nWkHt6HHNWbaC0JO4di9qI1KLOzQ8XJ7zBzzi80k8/e3ArkNJmMGQ6ZtRlxEUocWzgeSzadBVYPxx+jbqFL0wf/6O7xrpmYCQK3T27H0axC2Glu4eTqj7GHxveAQUgeGWf5MzUqr8JeGjvcw6eNQHgz6UtiJEQXNKa4chqNNVLgrMAW0piBijwv27lUIGMVxr2/SJARUvjX9fPeQ8L0FCQ9206fGtB/Mt44fBbfblmBCbErEN1vEFFmKVmjoq6eyXg+PlgvzyIMgX8KArXak3qP7IpOMYL/0XuSI8oTj4JzXJYVkZvIjyM2G7hHBIGfn6ezRzaRoIrSGncOgrf0G39A5CVXTv7qS+aarlGnNWEvMLeHkZvUXNB6iuCK7IvYhBiE2rqhJ/6DXSAX6KuDEepdgZheQGrKL8jKLkPrttLcTw9ExD/JK9U1vSGQoPUq9DlDlp7BK90C+evgWcuQu+lRbKWrG0U0176p4GzTC7PIQ0Og8NinWPC5MN6nr3T0ILT0v/uXOH3FKJrQIpQa//MU+EtfWL0iIaLL34llFqxAudie5Yv4ywSa6NKnR2ua/HUe2z4RJt1sf78X/IPO0uxTmr3DBVs/hHfrRNag0O4jZBXKQ8KTsWhkpS1yORZnCDQ0BGqRBJ0R9IhsAM7WFV7Uf5dco7VxFRZWHWoNaTrBeKt1bJUxoejyeks40o+7lJZMHKIlE0AFzm3Igd+rcndRDatuHQ1Prr9TafmJEEAwPHjjVatXdIee5C0FjZYeCO4pDKG1WwIB8uKKJmhNBLs1hUYUyy3rvie1TMgcgcpzWDwkjtzcbYzzLpxD8Ed7aKmBcbrP48mY1EJF08U0uH5iG779lghl3gsYcuRDLFuSBC8rZJK5NgmTPhUsr/5zjqC73rozrpazAtO++1Sw8IysQFM5wGjSDVoi6ac0+L8ShWVHgWU/pOJpGnzkBgEyVryGCWLdkc9PxIAnu9PDaAFO/PpfrPzhELZPiEPR7c14f1i0eSUshSHQgBG4T7+gBUQCvTgPn8VQfKHUYnrdJnrgkZECAXL1uHaIQNsYoXfSnL1NVPgAIdAN/Dwee0eYTHl4AKUmRXvFoKkVPNPTr5sIs8sHQkBXjsvk0swm0jP6J6XZZTQjySS4t4rFYz0S8EiPfug3bj7W/vQNPQZROEqu0TNFJtLC5ZVf3sW4aYL1FfdRCl7vHWxRjkvU5f6K5OWCxTZeNhZoXmAi4qVZp/rMADw5Llm4unGbaJoCzSZdriffA5g+9R10jo5CWHQChkzdiAVzxvDyRz6dgXTrc84EneyVIdDAEKg9S1BdP5CRjErbqMZmaw+9o7zJV5lPMzO5Gae1EMg6a07WGcg6q/XwVzw31PpN/E0UOrXH5D0nBcIwabKtgyefor6djfyCO/Bo1hLuJg8njq3644XnR2EGuTnPnboK0JIHecjdPR2jJ6zgk4RF7IaxOrmcECcrcOHrQpSswBgza9EZwURe2MVZlJZ/dLaurkJ58sZzj33qnFPibNIPMbh3SyFP9hrQ+2Ua0ZyL9TRDNDOnCOHhxu2XibIoQ6DBIVB7JPgA0FTVonfPTppTo7RAcyaTeORN1t06i9SD6TRPRwnOYxlAHU1oY0mZXJLFGx4CCrj4VmfTV+Loh9H4fBcQTe7R903cozTqjVvZAioeXo5G8HC7zIzk1hBSiJ5suouLkSh/obtKViCRKResWYFNouIplyPBDFy5DbTz4qQN4fz2tcJFmUZY8kAzo/lw4QjySpJo+ZFBlo+VXCdNQrC725oNk6LskiHwd0fAAlPIb0mWLXgS5ZkPFieTTRgVrMDt/PtgQeO+RmyLEr7ixBwdWXwqkxYWHqcegwtqWvQvxPSvmrz9mD7udUynJRAzxw3HidwHcpjq9VqNiA/rVvNZRj1CwB4h8bTEgMKRaf/GtrRsg9VYmYejS97nF6dz+a3bBHFvfLid9q1hm7Xnv8HYl9pDX**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

 2> Int(有符号整型)

  一般来说,你不需要专门指定整数的长度。Swift 提供了一个特殊的整数类型`Int`,长度与当前平台的原生字长相同:

   * 在32位平台上,`Int`和`Int32`长度相同。

   * 在64位平台上,`Int`和`Int64`长度相同。

  除非你需要特定长度的整数,一般来说使用`Int`就够了。这可以提高代码一致性和可复用性。即使是在32位平台上,`Int`可以存储的整数范围也可以达到`-2147483648`~`2147483647`,大多数时候这已经足够大了。

 3>UInt(无符号整型)

  Swift 也提供了一个特殊的无符号类型`UInt`,长度与当前平台的原生字长相同(具体范围见 1>整数范围):

   在32位平台上,`UInt`和`UInt32`长度相同。

   在64位平台上,`UInt`和`UInt64`长度相同。

  > 注意:尽量不要使用`UInt`,除非你真的需要存储一个和当前平台原生字长相同的无符号整数。除了这种情况,最好使用`Int`,即使你要存储的值已知是非负的。

  统一使用`Int`可以提高代码的可复用性,避免不同类型数字之间的转换,并且匹配数字的类型推测,请参考[类型安全和类型推测](#type_safety_and_type_inference)。

2. 浮点数

 

 1> 浮点数概述

原标题:03_Swift2基础之基本数据类型

关键词:数据类型

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