strcat
- Appends a copy of the source string to the destination string. The terminating null character in destination is overwritten by the first character of source, and a null-character is included at the end of the new string formed by the concatenation of both in destination.
- 后附 src 所指向的空终止字节字符串的副本到 dest 所指向的空终止字节字符串的结尾。字符 src[0] 替换 dest 末尾的空终止符。产生的字节字符串是空终止的。
- 若目标数组对于 src 和 dest 的内容以及空终止符不够大，则行为未定义。
- 若字符串重叠，则行为未定义。
- 若 dest 或 src 不是指向空终止字节字符串的指针，则行为未定义。
char * strcat ( char * destination, const char * source );
Parameters
destination
- Pointer to the destination array, which should contain a C string, and be large enough to contain the concatenated resulting string.
- 指向要后附到的空终止字节字符串的指针
source
- C string to be appended. This should not overlap destination.
- 指向作为复制来源的空终止字节字符串的指针
Return Value
- destination is returned.
- 该函数返回一个指向最终的目标字符串 dest 的指针。
Example
//
// Created by zhangrxiang on 2018/2/3.
//
#include <stdio.h>
#include <string.h>
int main() {
char str[] = "Hello C";
char str2[50] = "Hello World";
printf("%s\n", str);//Hello C
printf("%s\n", str2);//Hello World
char *str3 = strcat(str2, str);
printf("%s\n", str2);//Hello WorldHello C
printf("%s\n", str3);//Hello WorldHello C
str3 = "hi everyone";
printf("%s\n", str3);//hi everyone
printf("%s\n", str2);//Hello WorldHello C
str2[2] = 'L';
str[2] = 'L';
str[0] = 'h';
printf("%s\n", str2);//HeLlo WorldHello C
printf("%s\n", str);//heLlo C
char *str4 = "hi world";
// str[0] = 'H'; //行为为定义 h
printf("%c\n",str4[0]);//h
printf("%s\n",str4);
char str5[80];
strcpy (str5,"these ");
strcat (str5,"strings ");
strcat (str5,"are ");
strcat (str5,"concatenated.");
puts (str5);
//these strings are concatenated.
return 0;
}
文章参考