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add 'system' call
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C and C++.txt

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@@ -140,6 +140,10 @@
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(void) &a == &b;
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return _a > _b ? _a : _b)
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41、system函数是等到cmd执行完后返回吗?
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(tips:是的,这里联想Unix环境高级编程中的示例,先fork,
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然后子进程exec,主进程wait)
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