我對main
內部的{}
感到困惑。有人能解釋我的目的嗎?我確實瞭解代碼,但這是我第一次看到這種格式。功能中嵌套花括號的用途
爲什麼{}
需要這部分代碼,或者{}
裏面有什麼用的函數?它不是聲明一個嵌套函數,還是它?
int main()
{
void *p1, *p2, *p3;
arenaCheck();
p1 = malloc(254);
arenaCheck();
p2 = malloc(25400);
arenaCheck();
p3 = malloc(254);
printf("%llx %llx %llx\n", (long long)p1, (long long)p2, (long long)p3);
arenaCheck();
free(p2);
arenaCheck();
free(p3);
arenaCheck();
free(p1);
arenaCheck();
{ /* What is the purpose of these, what is this doing { } */
struct timeval t1, t2;
int i;
getutime(&t1);
for(i = 0; i < 10000; i++)
if (malloc(4) == 0)
break;
getutime(&t2);
printf("%d *** malloc(4) required %f seconds\n", i, diffTimeval(&t2,&t1));
}
return 0;
}
你刪除了它們並編譯並運行它以查看是否有任何區別? – Cyrus
[爲什麼用花括號括住C代碼塊?](http://stackoverflow.com/questions/1677778/why-enclose-blocks-of-c-code-in-curly-braces) – Cubia