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Chapter 11

# 0 1 2 3 4 5 6 7 8 9 base 8 octal digits 0 1 2 3 4 5 6

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Unformatted text preview: ther You can change “base” Base 10 == decimal; digits: 0 1 2 3 4 5 6 7 8 9 Base 8 == octal; digits: 0 1 2 3 4 5 6 7 Base 16 == hexadecimal; digits: 0 1 2 3 4 5 6 7 8 9 a b c d e f // simple test: // simple cout << 1234 << '\t' << hex << 1234 << '\t' << oct << 1234 << endl; cout << showbase << dec; // show bases // show cout << 1234 << '\t' << hex << 1234 << '\t' << oct << 1234 << '\n'; // results: // results: 1234 4d2 2322 1234 0x4d2 02322 Stroustrup/Programming // '\n' // '\n' 8 Floating-point Manipulators Floating-point You can change floating-point output format general – iostream chooses best format using n digits (this is the default) general iostream scientific – one digit before the decimal point plus exponent; n digits after . fixed – no exponent; n digits after the decimal point // simple test: // simple cout << 1234.56789 << "\t\t(general)\n" // \t\t to line up columns // \t\t << fixed << 1234.56789 << "\t(fixed)\n" << << scientific << 1234.56789 << "\t(scientific)\n"; << // results: // results: 1234.57 1234.567890 1234.567890 1.234568e+003 (general) (general) (fixed) (scientific) Stroustrup/Programming 9 Precision Manipulator Precision Precision (the default is 6) general – precision is the number of digits general Note: the general manipulator is not standard, just in std_lib_facilities.h Note: manipulator scientific – precision is the number of digits after the . (dot) fixed – precision is the number of digits after the . (dot) // example: // example: cout << 1234.56789 << '\t' << fixed << 1234.56789 << '\t' << scientific << 1234.56789 << '\n'; cout << general << setprecision(5) << 1234.56789 << '\t' << fixed << 1234.56789 << '\t' << scientific << 1234.56789 << '\n'; cout << general << setprecision(8) << 1234.56789 << '\t' << fixed << 1234.56789 << '\t' << scientific << 1234.56789 << '\n'; // results (note the rounding): // results 1234.57 1234.567890 1.234568e+003 1234.6 1234.56789 1.23457e+003 1234.5679 1234.56789000 1.23456789e+003 Stroustrup/Programming 10 Output field width Output A width is the number of character...
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