重定向函数过程如下:
重定向完后执行 其中int x = 10;
执行结果如下:
所有的字符内容可以正常输出 但是 “”%d” ,x 无法输出;
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我们这里有一篇关于printf使用的总结:https://software-dl.ti.com/ccs/esd/documents/sdto_cgt_tips_for_using_printf.html