Update ex5_24.cpp

增加头文件以使得编译通过。
Merge pull request #5 from wgqimut/patch-2

Update ex5_24.cpp
fix a bug
Revert "fix a bug"

This reverts commit c1f744dc47b149235ca97565d8aa523f14a2ec00.
fix a bug
fix the layout
Update README.md

int f();
sizeof f()==4;
etc..
Merge pull request #35 from shbling/patch-1

fix 4.30 README.md
fixed #6
Merge branch 'evan617-master'

improve the answer of exercise 3.37
fixed bugs of ex6_27 and ex6_28
fixed bugs of ex6_27 and ex6_28
Merge pull request #36 from pezy/upstream

fixed bugs of ex6_27 and ex6_28
Thx @Mr.M for reporting.
	new file:   ex41_01.cpp
	deleted:    ch41/ex41_01.cpp
fix some bugs
Fix the exercise4.30
Update README.md
Merge branch 'master' of https://github.com/evan617/Cpp-Primer into evan617-master
Merge branch 'evan617-master'