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关于memset赋值的探讨
2022-07-05 14:01:00 【蜡笔小金QAQ】
memset赋值
尽量用0x3f3f3f3f赋值,这样memset赋值结果和“=”赋值号效果相同,不会出现数字对不上。
0x7fffffff同理(7个f)
这是运行代码
可以看到对于memset,这四种方法是等效的。
#include <bits/stdc++.h>
using namespace std;
int a[100];
int main()
{
memset(a, 0x3f, sizeof(a));
cout << a[0] << endl;
memset(a, 0x3f3f, sizeof(a));
cout << a[0] << endl;
memset(a, 0x3f3f3f, sizeof(a));
cout << a[0] << endl;
memset(a, 0x3f3f3f3f, sizeof(a));
cout << a[0] << endl;
cout << 0x3f << endl;
cout << 0x3f3f << endl;
cout << 0x3f3f3f << endl;
cout << 0x3f3f3f3f << endl;
return 0;
}
运行结果:
1061109567
1061109567
1061109567
1061109567
63
16191
4144959
1061109567
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