编写strcpy遇到的warning: suggest parentheses around assignment used as truth value [-Wparentheses]|

这是我一开始写的

char *mycat(char *a,const char *b)
{
    int i=0;
    int lena,lenb;
    lena=strlen(a);
    lenb=strlen(b);
    do
    {
        a[lena]=b[i];
        lena++;
        i++;
    }while(i<lenb);
    return a;
}

这是查阅资料后抄的：

char *mystrcat(char *s1,const char *s2){
     char *cp = s1;
        while( *cp )
            cp++;
        while( *cp++ = *s2++ ) ;
    return s1;
}

然而在编译过程中遇到了：warning: suggest parentheses around assignment used as truth value [-Wparentheses]|

在查阅优快云的文章后，把while(*cp++ = *s2++);的判断语句加上括号就可以了。

感谢：gcc实践(1)： warning: suggest parentheses around assignment used as truth value [-Wparentheses]