printf()格式各种数据格式，整数，浮点数，字符串，字符，指针

#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;
}