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Formatting Data
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You can set or clear more than one flag in a single call to setf( ) or unsetf( ) by OR-ing two or more flags together For example, this turns on both the showpos and boolalpha flags:
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mystreamsetf(ios::showpos | ios::boolalpha);
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The following turns off the uppercase and boolalpha flags:
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mystreamunsetf(ios::uppercase | ios::boolalpha);
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You can obtain the current format flag settings by using flags( ) It is shown here: fmt ags ags( ) const It returns the current format flag bitmask It, too, is declared by ios_base It is important to understand that each stream instance has its own set of format flags Therefore, changing the flag settings for a stream affects only that stream The format flags of any other stream are unchanged
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The following example shows how to set and clear format flags It first sets the boolalpha flag on cout and then displays a bool value It then clears the boolalpha flag and redisplays the value Notice the difference in the output
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// Demonstrate the setf() and unsetf() functions #include <iostream> using namespace std; int main() { // Set the boolalpha flag on cout coutsetf(ios::boolalpha); cout << "The value true when the boolapha flag is set: " << true << endl;; // Now, clear the boolalpha flag coutunsetf(ios::boolalpha); cout << "The value true when the boolapha flag is cleared: " << true << endl;; return 0; }
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The output is shown here:
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The value true when the boolapha flag is set: true The value true when the boolapha flag is cleared: 1
Herb Schildt's C++ Programming Cookbook
Bonus Example: Display the Format Flag Settings
When debugging format problems, it is sometimes helpful to see how all of the format flags are set It has been my experience that some compilers behave in unexpected ways due to the interaction of seemingly unrelated flags Also, there can be differences between compilers when two flags conflict For example, if both the oct and dec flags are set, which format is used Different compilers might resolve this situation differently (Of course, good programming practice dictates that only one of the flags oct, dec, or hex is set at any one time) Being able to see the actual flag settings can help explain otherwise unusual results Towards this end, the following program creates a function called showflags( ), which takes a stream as an argument and displays the current settings of that stream's format flags:
// This program creates a function called showflags() // that displays the format flag settings associated // with a given stream #include <iostream> using namespace std; void showflags(ios &strm) ; int main() { // Show default condition of format flags cout << "Default settings for cout:\n"; showflags(cout); // Set the right, showpoint, and fixed flags coutsetf(ios::right | ios::showpoint | ios::fixed); // Show flags after call to setf() cout << "Flags after setting right, showpoint, and fixed:\n"; showflags(cout); return 0; } // This function displays the status of the format flags // for the specified stream void showflags(ios &strm) { ios::fmtflags f; // Get the current flag settings f = strmflags(); if(f & ios::boolalpha) cout << "boolalpha:\ton\n"; else cout << "boolalpha:\toff\n"; if(f & ios::dec) cout << "dec:\t\ton\n"; else cout << "dec:\t\toff\n";
6:
Formatting Data
if(f & ios::hex) cout << "hex:\t\ton\n"; else cout << "hex:\t\toff\n"; if(f & ios::oct) cout << "oct:\t\ton\n"; else cout << "oct:\t\toff\n"; if(f & ios::fixed) cout << "fixed:\t\ton\n"; else cout << "fixed:\t\toff\n"; if(f & ios::scientific) cout << "scientific:\ton\n"; else cout << "scientific:\toff\n"; if(f & ios::right) cout << "right:\t\ton\n"; else cout << "right:\t\toff\n"; if(f & ios::left) cout << "left:\t\ton\n"; else cout << "left:\t\toff\n"; if(f & ios::internal) cout << "internal:\ton\n"; else cout << "internal:\toff\n"; if(f & ios::showbase) cout << "showbase:\ton\n"; else cout << "showbase:\toff\n"; if(f & ios::showpoint) cout << "showpoint:\ton\n"; else cout << "showpoint:\toff\n"; if(f & ios::showpos) cout << "showpos:\ton\n"; else cout << "showpos:\toff\n"; if(f & ios::uppercase) cout << "uppercase:\ton\n"; else cout << "uppercase:\toff\n"; if(f & ios::unitbuf) cout << "unitbuf:\ton\n"; else cout << "unitbuf:\toff\n"; if(f & ios::skipws) cout << "skipws:\t\ton\n"; else cout << "skipws:\t\toff\n"; cout << " \n"; }
The output is shown here (This output was generated by Visual C++ Your compiler may show different default settings)
Default settings for cout: boolalpha: off dec: on hex: off oct: off fixed: off scientific: off right: off
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