似乎使用该函数strsep查找字符串的第一个字存在指针兼容性问题。到目前为止,我一直认为char *s并且char s[]可以完全互换。但是看来它们不是。我的程序在堆栈上使用数组失败,并显示以下消息:
foo.c: In function ‘main’:
foo.c:9:21: warning: passing argument 1 of ‘strsep’ from incompatible pointer type [-Wincompatible-pointer-types]
char *sub = strsep(&s2, " ");
^
In file included from foo.c:2:0:
/usr/include/string.h:552:14: note: expected ‘char ** restrict’ but argument is of type ‘char (*)[200]’
extern char *strsep (char **__restrict __stringp,
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我不明白这个问题。该程序使用的malloc作品。
这有效:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void)
{
char s1[] = "Hello world\0";
char *s2 = malloc(strlen(s1)+1);
strcpy(s2, s1); …Run Code Online (Sandbox Code Playgroud) 我有这个:
char * str = "hahahahahihihihihohohohohahahahahihihihihohohohohahahahahihihihihohohohohahahahahihihihihohohohohahahahahihihihihohohohohahahahahihihihihohohoho\0";
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我该如何正确设置其格式,以80列中断?使用方法:
char * str = "foo\
bar";
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似乎是一个非常糟糕的主意,它导致未定义的行为,使strlen()返回的废话值
编辑:这是我正在谈论的未定义的行为:
#include <stdio.h>
#include <string.h>
int main(void)
{
char *s = "haha\
hihi\0";
unsigned i = strlen(s);
printf("Length: %i\n", i);
return 0;
}
imperator@RomaAeterna ~/P/C/undefined> gcc -Wall -Wextra undefined.c
imperator@RomaAeterna ~/P/C/undefined> ./a.out
Length: 14
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