1.strcat()函数的调用形式
strcat(字符串1,字符串2);
2.功能
将字符串2链接到字符串1的末尾,形成一个新字符串
#include<stdio.h>
#include<string.h>
int main()
{
char s1[50] = "hello";
char s2[50] = "world";
strcat(s1, s2);
printf("%s", s1);
return 0;
}
3.模拟实现strcat函数
#include<stdio.h>
#include<string.h>
#include<assert.h>
void * my_strcpy(char*dest, const char*src)
{
assert(dest != NULL);//断言,如果为空指针,编译器会报错
assert(src != NULL);
while (*dest++ = *src++)
{
;
}
}
char * my_strcat(char *dest, const char *src)
{
char *ret = dest;//保存字符串s1的首地址,最后要输出,这个地址不能丢
assert(dest != NULL);
assert(src != NULL);
//找到字符串s1的'\0'
while (*dest != '\0')
{
dest++;
}
//从'\0'处开始拷贝字符串s2
my_strcpy(dest, src);
return ret;
}
int main()
{
char s1[50] = "hello";
char s2[50] = "world";
my_strcat(s1, s2);
printf("%s", s1);
return 0;
}