请教下：关于LR的 sscanf 函数

shinetony

看了帮助文档，例子如下：
Action() {

     char sentence[] = "After 7 years' siege yet Troy walls stand";
     char s1[32], s2[32];
     int num_of_years;

     sscanf(sentence,"%s %d %s", s1, &num_of_years, s2);
     lr_output_message("Number of years=%d s2=\"%s\"", num_of_years, s2);

     return 0;
}

Output:
Action.c(7): Number of years=7 s2="years'"

有个地方不明白 ：     sscanf(sentence,"%s %d %s", s1, &num_of_years, s2);
我去掉&num_of_years前面的  & 之后就报错：

Action.c(7): Error: C interpreter run time error: Action.c (7):  Error -- memory violation : Exception ACCESS_VIOLATION received.

请问这是什么问题？

msnshow

规定的语法是这样的