如何清空char数组? [英] How to empty a char array?

问题描述

具有类似于char成员[255]的char数组.如何不使用循环将其完全清空?

Have an array of chars like char members[255]. How can I empty it completely without using a loop?

char members[255];

空"的意思是，如果其中存储了一些值，则应该没有.例如，如果我使用strcat，则旧值不应保留

By "empty" I mean that if it had some values stored in it then it should not. For example if I do strcat then old value should not remain

members = "old value";

//empty it efficiently
strcat(members,"new"); // should return only new and not "old value new"

推荐答案

使用

  memset(members, 0, 255);

一般

  memset(members, 0, sizeof members);

如果数组在范围内，则为

if the array is in scope, or

  memset(members, 0, nMembers * (sizeof members[0]) );

如果只有指针值，并且nMembers是数组中的元素数.

if you only have the pointer value, and nMembers is the number of elements in the array.

编辑当然，现在要求已从清除数组的一般任务更改为纯粹重置字符串，memset是过大的选择，只是将第一个元素清零就足够了(如其他答案中所述).

EDIT Of course, now the requirement has changed from the generic task of clearing an array to purely resetting a string, memset is overkill and just zeroing the first element suffices (as noted in other answers).

编辑为了使用 memset ，您必须包括string.h .

EDIT In order to use memset, you have to include string.h.

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