c++学习随笔 setw( n )

About the use of setw( int n )， First the setw() is included in the header comment #include, Setw means “set the width”,it’s usually right-aliged in the field of n spaces , you can type like this :

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cout << setw(25) << "Hello World " << endl;

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Hello World

If you want to set the characters being left-aligned, you can use setiosflags(ios::left). Also, you may use setfill() to fill the blanks with “*” “@” and so on, let me give an example:

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cout << setw(25) << setiosflags(ios::left) << "Hello World " << endl;
cout << setw(25) << setiosflags(ios::left) << setfill('*') << "Hello World " << endl;

you will see

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Hello World
Hello World**************

Decomposing makes everything easier…(分解使一切变得更容易！)

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srand()   rand()