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 
    
     #include 
     
      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;}