Question

请编写一个自定义函数mystrcat，该函数要完成库函数strcat的功能，请编写main函数

Answer 1

#include <stdio.h>

char *mystrcat(char *s1, char *s2)
{
char *p = s1;
char *q = s2;
while (*p != '\0') p++;
while (*q != '\0') *p++ = *q++;

*p = '\0';

return s1;
}

int main()
{
char a[100] = "hello";
char *b = " baidu";
printf("%s\n", mystrcat(a, b)); // 运行结果为hello baidu
return 0;
}