printf()格式各种数据格式，整数，浮点数，字符串

#include <stdio.h>

int main (voID)
{
    char            c = 'A';
    char            s[] = "abcdefghijklmnopqrstuvwxyz";
    int             i = 999;
    short int       j = 17;
    unsigned int    u = 0xf123U;
    long int        l = 12312L;
    long long int   L = 0x1234567812345678LL;
    float           f = 12.978F;
    double          d = -12.3456;
    char            *cp = &c;
    int             *ip = &i;
    int             c1, c2;

    printf ("Integers:\n");
    printf ("%i %o %x %u\n", i ,i ,i, i);
    printf ("%x %X %#x %#X\n", i, i, i, i);
    printf ("%+i % i %07i %.7i\n", i, i, i, i);
    printf ("%i %o %x %u\n", j ,j ,j, j);
    printf ("%i %o %x %u\n", u ,u ,u, u);
    printf ("%ld %lo %lx %lu\n", l ,l ,l, l);
    printf ("%lli %llo %llx %llu\n", L ,L ,L, L);

    printf ("\nfloats and Doubles:\n");
    printf ("%f %e %g\n", f, f, f);
    printf ("%.2f %.2e\n", f, f);
    printf ("%.0f %.0e\n", f, f);
    printf ("%7.2f %7.2e\n", f ,f);
    printf ("%f %e %g\n", d ,d ,d);
    printf ("%.*f\n", 3 ,d);
    printf ("%*.*f\n", 8 ,2 ,d);

    printf ("\nCharacters:\n");
    printf ("%c\n", c);
    printf ("%3c%3c\n", c, c);
    printf ("%x\n", c);

    printf ("\nStrings:\n");
    printf ("%s\n", s);
    printf ("%.5s\n", s);
    printf ("%30s\n", s);
    printf ("%20.5s\n", s);
    printf ("%-20.5s\n", s);

    printf ("\nPointers:\n");
    printf ("%p  %p\n\n",  ip,  cp);

    printf ("This%n is fun.%n\n", &c1, &c2);
    printf ("c1 = %i, c2 = %i\n", c1, c2);

    return 0;
}