Commit 40bf6a4

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add comment for reading binary file

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Original file line number	Diff line number	Diff line change
`@@ -7,10 +7,20 @@`
`7`	`7`
`8`	`8`	`int main(){`
`9`	`9`	`std::ifstream in("xxx.txt");`
	`10`	`+`
	`11`	`+ // this only works if there is no whitespace`
	`12`	`+ // in >> content;`
`10`	`13`
`11`	`14`	`// Method 1`
`12`	`15`	`std::string content1((std::istreambuf_iterator<char>(in)),`
`13`	`16`	`std::istreambuf_iterator<char>());`
	`17`	`+`
	`18`	`+ /**`
	`19`	`+ same as`
	`20`	`+ std::string content1;`
	`21`	`+ content1.assign((std::istreambuf_iterator<char>(in)),`
	`22`	`+ std::istreambuf_iterator<char>());`
	`23`	`+ **/`
`14`	`24`
`15`	`25`	`// Method 2`
`16`	`26`	`std::stringstream ss;`

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