printf()打印十六进制，八进制，十进制，二进制数字段宽度

#include <stdio.h>


int main( void )
{
    float d1 = 10000.123;
    int n, f;
    char *m1 = Binary;
    char *m2 = Decimal;
    char *m3 = Octal;
    char *m4 = Hexadecimal;


    puts(Outputting a number with different field widths.\n);

    printf(%5f\n, d1);
    printf(%10f\n, d1);
    printf(%15f\n, d1);
    printf(%20f\n, d1);
    printf(%25f\n, d1);

    fflush(stdin);

    puts(\nUse the * field width specifier to obtain field width);
    puts(from a variable in the argument list.\n);

    for (n=5;n<=25; n+=5)
        printf(%*f\n, n, d1);

    puts(\n Press Enter to continue...);
    fflush(stdin);
    getchar();

    puts(\nInclude leading zeros.\n);

    printf(%05f\n, d1);
    printf(%010f\n, d1);
    printf(%015f\n, d1);
    printf(%020f\n, d1);
    printf(%025f\n, d1);

    fflush(stdin);

    puts(\ndisplay in octal, decimal, and hexadecimal.);
    puts(Use # to precede octal and hex output with 0 and 0X.);
    puts(Use - to left-justify each value in its field.);

    printf(%-15s%-15s%-15s, m2, m3, m4);

    for (n = 1;n< 20; n++)
        printf(\n%-15d%-#15o%-#15X, n, n, n);

    fflush(stdin);

    puts(\n\nUse the %n conversion command to count characters.\n);

    printf(%s%s%s%s%n, m1, m2, m3, m4, &n);

    printf(\n\nThe last printf() output %d characters.\n, n);

    return 0;
}