C语言复习

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算术表达式优先级数值越小,顺序越先,等优先级从左到右算;

算数表达式的变量必须有确定的值;

赋值表达式的结合顺序是从右到左;

强制转换的时候,转换类型必须有小括号();

逗号表达式的结合顺序是从左到右;

035是八进制的整形常量(一般8进制整形都是0开头)

0xla是十六进制整形常量(一般16进制整形都是0x开头)

赋值运算符顺序从右到左;

void main(){printf("%d\n",-2147483648-1);printf("%d",2147483647+5);}//输出1.2147483647//      2.-2147483648
需要再 深入理解溢出的原理

#include <stdio.h>void main(){int a=10,b=3;a=(double)a/b;printf("a=%d,%lf,b=%d",a,a,b);}
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6EcGCLYkv1qlBeQ+2AVvrsAogyXujz0puXK4U28mU8kBfLXVa6RBsIwGqtd59jdWOzY/EbCh0a8DoekyVninUzmsSSxIv06QLfQwGdali/VL99fh/Qkn2eqLdjODTp8kOj3jhzmGvQ9+yr+hN1T1vcOAY4DIpFQz+Hwlb/72+4f/vGDhUQX2MUmHYXASXIHweMQ/uKV/xLXlcZ8PCzN2EUhoBjEJ0mKKJ8y43DRwMK5SV08VERCVo85/FEWERnzn1yQ4uOgK0sjm9gP07LvP0FL8d5fsZt0ei9m0bfFMDTY44D0pUIsbIzQiV6UjDPYkigXlOlF1foaZ8MfY9tKe5FD7g9fntica8VHn18vX+xbtzixR3uNdDS3uBxGzBjrDRSvRb50EP0dCXcCeuXaDhjyiUmHw+hg4AMA9DgksIKvCCMKUh1D4SM1DgdWaw2BhsBJCMQBkReRLmLuHDgc/vJLXzjJQBNqCDQEGgINgeeJQLlnfp7JtawaAg2BhkBD4HwE9JukefvgpxXnW2qaDYGGQEOgIfCsEDi4g6jOimeVZEumIdAQaAg0BG6OgL+DyLsIf1GIjeoLxZubHDTee++9YaLRu+++ezBfmoz1kb+JjSX9x86fw6eO/SaY1DZrG0lPW1M8ZJKf8q2fRqDGr2E2jdFdURPrhvNdITrYObiDGMi3H9WLlguXtFOspyy6+UIv6Us2Ui516WlJz/6x8h3szFvmMyMyy1rKv7afGGEw9WaNN2ZX4/eQcDz19Xrq8T/k2t+Fb/3bDrpdGD1buosbiLu+QG67UZb0Hzv/LhZ7zsZS/nO6jfc4EXjqa3pq/Hddax7naj5MVPz3X/wSffmN9uELa8IZL9B4Icb8TGEsl/Rz+2N+TrW3pP/Y+Ut51vHX2Nf02kYtA/2YXK0zHtc62Mt5bTtpqVvzoN2Wn3aP9XP2xzxsHIsv6amT82N+j9HH+jlP+bHd5Cd9PE+9qT5l4dXjtDWmM695zJdabRfZsf4cf8wb69f8elz7qOlz+vBoU7pJS1s5Rz5pjGk1LyjP/708Yjo8GDJtAMkXtCnAkl/3qZ86qYfMue02uvhc0n/s/DnciD3jT6wz5+TV/ZSt1J/iYTPtplz2Y/mUyz79Ipe0enwuf+x3ap62M9baf8qnTB1T8u6yT9/jWC7lP/2QQ/qoaXU8SU/aKXmnbNpGJ2n1+Bg/fRzjZ0zIpUxNq+lpa6pPXXh1fFOyNS1lz9WvbT3lsR4xRfgcEeNHSwnSsQSP8euFzDGyvHJ+zOaYfszHWO7YfEn/sfOP5XUK/Vhu9Rock6nt1/I1PcfYQGbK1hQNvZRPXeZ1W+LXssfGx3wfk78UPeMY54i/5F3K933Zncrtvnxf0s9zWZ9zMRr+LSZb4IiIu4kEJhc+57Wj5NW0S4xv62dJ/7Hzz8V0Ka+0e6pcyo/71M++5k/Rkp+83Fs5P5WfclP92GbOp2QvTSMv/PM6luOlY2j2z0NgvF7nWXm6Wus6dP/bPTXhFuO8IJZMpBz9VFtaoNvqL9l/aP5SflOY3YS2lN9NbM3JZh4pU88zBmjZlvgpd8m+jitjS9pN/aZe2hnr1/kmr9ZJvaSlzKn9lP1TdU+Re+r2l3K8dH5L/h+Kv/rG9/TvqfKbTKW981bXfe7zf9j91Z/+cQco2diYOT91k6Z8bSPH2dcyY7s1L+XnZOZ4U/pL9h+aT8x1DHV+SYeWY+RrGeZzrdZLudQf85Keckt85JZkbsvPWI71tX3iz/l4XMc6zjNt17pJm+tTHpm0mbTxPO0kPed1P9ateXPj1ENmbL/mTfHn7MJb0p/jJy9jGs/Td9KZp+wUL2kpl3qpM54jl7QlHfi0tBWzl/G++pfv8X91Df/0bH1AXBqCXKCXCPwp2DZ8TkHp8jIPvQ4P7f/yCDcPjxUBfwdR/8PO9xloOxjm0W74zONzSW4W5fRx32vx0P4z79a/bARGX1K/bDBa9g2BROC+D4T0m/1D+884Wv+yERgOiOm/CvGy0WnZNwQaAg2BF4zAwW8xDV9Vv2BEWuoNgYZAQ6AhYAT4fxw9GA6HdivR9kZDoCHQEGgI8D+v0w7+sb7hqGgANQQaAg2BhsDLRaB/xMT/CXGXf1Hu5ULaMm8INAQaAs8Dgf6AuPYPMT2P/FoWDYGGQEOgIXAmAq/8jUP1VCn/d7kz7TW1hkBDoCHQEHgmCKzbncMzWcmWRkOgIdAQuGMEhkdMd2y4mWsINAQaAg2Bp41AOyCe9vq16BsCDYGGwMUQaAfExaBthhsCDYGGwNNGQP8n9dNOoEXfEGgINAQaApdB4OAOgl9mqn6h6TIem9WGQEOgIdAQeBII9AdEOxiexHq1IBsCDYGGwL0h4AOiHQ73hndz1BBoCDQEngwC/ue+668h6vGTyaIF2hBoCDQEGgJ3jkD/iOnOLTeDDYGGQEOgIfCkEWgHxJNevhZ8Q6Ah0BC4HALtgLgcts1yQ6Ah0BB40gj8P/J1JCDioayRAAAAAElFTkSuQmCC" 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为什么会这样?
<pre name="code" class="cpp">scanf("a=%3d",&a);在读取时,需要同时把“a=”打上;否则赋值不了

getche();//输入显示不等待

getch();输入不显示也不等待(注:直接用getch();不赋值可以实现分屏显示)

getchar();输入显示等待

字符输入时需要注意空格也是一个字符!!

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