c - malloc() 打破循环

Question

为什么下面的代码直接显示Mb占用的堆:

int Mb = 0;
while ( malloc(1<<20)) ++Mb;
printf("Allocated %d Mb total\n", Mb);

1<<20是什么意思？

Answer 1

What is meant by 1<<20?

A 1，左移20位，又称为2^20 = 1048576。<<是向左移动的位移运算符。