编写取子字符串函数void fun(char s1[],char s2[],int m,int n),其作用是将字符数组s2中从第m个字符开始

#includevoid fun(char s1[],char s2[],int m,int n){ int len=0; int count = 0; while(s2[len]) len++; for (;m<=len && (count < n);++count;) //加个变量统计计数就可以了，没必要那么繁琐 *(s1++)=*(s2-1+m++);}void main(){ static char a[100],b[100]; int s,len; void fun