字符串指针数组对比 [英] Character String Pointer vs. Array

问题描述

我想知道是否有什么不同（在语法和性能方面）像

I was wondering if there is any difference (in terms of syntax and performance) between a string defined like

char str[200];

和

char *str;
str = calloc(200, sizeof(char));

是否有使用方面的差异？ （防爆，一个就是不要跟函数strncpy 或兼容的东西），更重要的同时，有没有在性能方面的差异？

Are there differences in terms of usage? (for ex, one is not compatible with strncpy or something) And more importantly, are there differences in terms of performance?

编辑：据我了解，由的char *定义了一个数组和释放calloc CAN增长和收缩，但我应该选择堆内存超过堆栈存储器或因故其他方式？这就是我真的想问问。

I understand that an array defined by char * and calloc can grow and shrink, but should I pick heap memory over stack memory or the other way around for any reason? That's what I was really trying to ask.

推荐答案

字符海峡[200] 在栈内存中分配，其中作为释放calloc（） 分配在堆内存。

char str[200] allocated in stack memory where as calloc() allocates in heap memory.

，由calloc（）的性质，它分配0到它分配的所有字节。

By nature of calloc(), it assigns 0 to all the bytes allocated by it.

请参照栈和堆比较以下

<一个href=\"http://stackoverflow.com/questions/161053/c-which-is-faster-stack-allocation-or-heap-allocation\">C++这是更快：堆栈分配或堆分配

的http://www.linuxquestions.org/questions/programming-9/stack-faster-than-heap-685004/

什么，在哪里栈和堆？

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