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%i %e %E %f %g %G %o %s %u %x %X %p %n
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Signed decimal integers Scientific notation (lowercase e) Scientific notation (uppercase E) Decimal floating point Uses %e or %f, whichever is shorter Uses %E or %F, whichever is shorter Unsigned octal String of characters Unsigned decimal integers Unsigned hexadecimal (lowercase letters) Unsigned hexadecimal (uppercase letters) Displays a pointer The associated argument must be a pointer to an integer This specifier causes the number of characters written so far to be put into that integer Prints a % sign
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%% Table 8-2
printf( ) Format Specifiers (continued)
Printing Characters
To print an individual character, use %c This causes its matching argument to be output, unmodified, to the screen To print a string, use %s
Printing Numbers
You may use either %d or %i to indicate a signed decimal number These format specifiers are equivalent; both are supported for historical reasons To output an unsigned value, use %u The %f format specifier displays numbers in floating point
8:
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THE FOUNDATION OF C++: THE C SUBSET
The %e and %E specifiers tell printf( ) to display a double argument in scientific notation Numbers represented in scientific notation take this general form: xdddddE+/ yy If you want to display the letter "E" in uppercase, use the %E format; otherwise use %e You can tell printf( ) to use either %f or %e by using the %g or %G format specifiers This causes printf( ) to select the format specifier that produces the shortest output Where applicable, use %G if you want "E" shown in uppercase; otherwise, use %g The following program demonstrates the effect of the %g format specifier:
#include <stdioh> int main(void) { double f; for(f=10; f<10e+10; f=f*10) printf("%g ", f); return 0; }
It produces the following output
1 10 100 1000 10000 100000 1e+006 1e+007 1e+008 1e+009
You can display unsigned integers in octal or hexadecimal format using %o and %x, respectively Since the hexadecimal number system uses the letters A through F to represent the numbers 10 through 15, you can display these letters in either upperor lowercase For uppercase, use the %X format specifier; for lowercase, use %x, as shown here:
#include <stdioh> int main(void) { unsigned num; for(num=0; num<255; num++) { printf("%o ", num); printf("%x ", num);
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printf("%X\n", num); } return 0; }
Displaying an Address
If you wish to display an address, use %p This format specifier causes printf( ) to display a machine address in a format compatible with the type of addressing used by the computer The next program displays the address of sample:
#include <stdioh> int sample; int main(void) { printf("%p", &sample); return 0; }
The %n Specifier
The %n format specifier is different from the others Instead of telling printf( ) to display something, it causes printf( ) to load the variable pointed to by its corresponding argument with a value equal to the number of characters that have been output In other words, the value that corresponds to the %n format specifier must be a pointer to a variable After the call to printf( ) has returned, this variable will hold the number of characters output, up to the point at which the %n was encountered Examine this program to understand this somewhat unusual format code
#include <stdioh> int main(void) { int count; printf("this%n is a test\n", &count); printf("%d", count);
8:
C-Style Console I/O
THE FOUNDATION OF C++: THE C SUBSET
return 0; }
This program displays this is a test followed by the number 4 The %n format specifier is used primarily to enable your program to perform dynamic formatting
Format Modifiers
Many format specifiers may take modifiers that alter their meaning slightly For example, you can specify a minimum field width, the number of decimal places, and left justification The format modifier goes between the percent sign and the format code These modifiers are discussed next
The Minimum Field Width Specifier
An integer placed between the % sign and the format code acts as a minimum field width specifier This pads the output with spaces to ensure that it reaches a certain minimum length If the string or number is longer than that minimum, it will still be printed in full The default padding is done with spaces If you wish to pad with 0's, place a 0 before the field width specifier For example, %05d will pad a number of less than five digits with 0's so that its total length is five The following program demonstrates the minimum field width specifier:
#include <stdioh> int main(void) { double item; item = 1012304; printf("%f\n", item); printf("%10f\n", item); printf("%012f\n", item); return 0; }
This program produces the following output:
10123040 10123040 00010123040
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