实例 3

使用 printf() 来演示所有可能的格式值：

$num1 = 123456789;

$num2 = -123456789;

$char = 50; // The ASCII Character 50 is 2

// Note: The format value "%%" returns a percent sign

printf("%%b = %b
",$num1); // Binary number

printf("%%c = %c
",$char); // The ASCII Character

printf("%%d = %d
",$num1); // Signed decimal number

printf("%%d = %d
",$num2); // Signed decimal number

printf("%%e = %e
",$num1); // Scientific notation (lowercase)

printf("%%E = %E
",$num1); // Scientific notation (uppercase)

printf("%%u = %u
",$num1); // Unsigned decimal number (positive)

printf("%%u = %u
",$num2); // Unsigned decimal number (negative)

printf("%%f = %f
",$num1); // Floating-point number (local settings aware)

printf("%%F = %F
",$num1); // Floating-point number (not local settings aware)

printf("%%g = %g
",$num1); // Shorter of %e and %f

printf("%%G = %G
",$num1); // Shorter of %E and %f

printf("%%o = %o
",$num1); // Octal number

printf("%%s = %s
",$num1); // String

printf("%%x = %x
",$num1); // Hexadecimal number (lowercase)

printf("%%X = %X
",$num1); // Hexadecimal number (uppercase)

printf("%%+d = %+d
",$num1); // Sign specifier (positive)

printf("%%+d = %+d
",$num2); // Sign specifier (negative)

?>

运行结果：

%b = 111010110111100110100010101

%c = 2

%d = 123456789

%d = -123456789

%e = 1.234568e+8

%E = 1.234568E+8

%u = 123456789

%u = 4171510507

%f = 123456789.000000

%F = 123456789.000000

%g = 1.23457e+8

%G = 1.23457E+8

%o = 726746425

%s = 123456789

%x = 75bcd15

%X = 75BCD15

%+d = +123456789

%+d = -123456789