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请编写函数fun()，其功能是：将s所指字符串中除了下标为偶数、同时ASCII值也为偶数的字符外，其余的全部删除，串中剩余字符所形成的一个新中放在t所指的数组中。 例如，若s所指字符串中的内容为ABCDEFG123456，其中字符A的ASCII码值为奇数，因此应当删除；其中字符B的 ASCII码值为偶数，但在数组中的下标为奇数，因此也应当删除；而字符2的ASCII码值为偶数，所在数组中的下标也为偶数，因此不应当删除，其他依此类推。最后t所指的数组中的内容应是246。 注意：部分源程序给出如下。 请勿改动主函数main和其他函数中的任何内容，仅在函数fun的花括号中填入所编写的若干语句。 试题程序： #include＜conio.h＞ #include＜stdio.h＞ #include＜string.h＞ void fun(char*s，char t[]) main() char s[100]，t[100]； clrscr()； printf("\nPlease enter string S：")； scanf("%s"，s)； fun(s,t)； printf("\nThe result is：%s\n"，t)；
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在一棵二叉树上第5层的结点数最多是( )。
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