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char *va_list;
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#define va_start(ap,v)( ap = (va_list)&v +
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#define va_arg(ap,t) ( *(t
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struct student {
int num;
int score;
int length;
};
struct student *pt;
pt = (struct student *) malloc(sizeof(struct student));
pt->num = 1;
pt->score = 90;
pt->length = 3 * sizeof(int);
printf("pt length:%d\n", *pt);
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