Chap3 - Chapter 3 1 Outline Formatting Numbers for Program...

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1 Chapter 3
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2 Outline Formatting Numbers for Program Output Using Mathematical Library Functions Program Input Using the cin Object Symbolic Constants
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3 Formatting Numbers for Program Output Proper output formatting contributes to ease of use and user satisfaction cout with stream manipulators can control output formatting
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4 Formatting Numbers for Program Output (continued) Table 3.1 Commonly Used Stream Manipulators
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5 Formatting Numbers for Program Output (continued) Table 3.1 Commonly Used Stream Manipulators (continued)
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6 Formatting Numbers for Program Output (continued)
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7 Formatting Numbers for Program Output (continued) iomanip header file must be included to use manipulators requiring arguments The field width manipulator setw () only affect the number immediately followed Other manipulators remain in effect until they are changed
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8 Formatting Numbers for Program Output (continued) Formatting floating-point numbers requires three field-width manipulators to Set the total width of the display using setw Force a decimal place using fixed Set the number of significant digits after the decimal point using setprecision Example: produces this output:
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9 Formatting Numbers for Program Output (continued) If the field width is too small, cout ignores the setw manipulator setting and allocates enough space for printing setprecision : sets the number of digits after the decimal point if a decimal point has been explicitly forced; otherwise, it sets the total number of displayed digits If setprecision setting is too small, the fractional part
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