长整数转换成16进制字符串

要将长整数转换成十六进制字符串，可以使用函数f( long int x, char *p )。这个函数接受一个长整数x和一个指向字符数组的指针p作为参数。函数的功能是将转换得到的十六进制字符串写入p所指向的数组中。你可以在主函数main()中输入一个长整数，然后调用函数f()，输出转换后的十六进制字符串结果。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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