Use in printf (C language)

#include <stdio.h>int main (int argc, const char * argv[]) {//Reshape output printf ("%d,%d", 3,4);    printf ("\ n");    The character width of the shaping output,%MD printf ("%4d,%4d", 3,4);    printf ("\ n");    Long shaping format output printf ("%ld,%ld", (Long) 3, (long) 4);    printf ("\ n");    Long shaping can also set the output character width of printf ("%8ld,%8ld", (Long) 3, (long) 4);    printf ("\ n");    Output%o int a =-1 in 8 binary format;    printf ("%d,%o", a,a);    printf ("\ n"); printf ("%d,%13o", a,a);    Sets the output width of the character//-1 in memory (in the form of a complement): eg:111111111 (the first bit is the sign bit) printf ("\ n");    x symbol output 16 binary int b =-1;        printf ("%x,%o,%d", b,b,b);    printf ("\ n");    U is unsigned output int c =-1;    unsigned int d = 65535;    printf ("%x,%o,%d,%u", c,c,c,c);    printf ("\ n");        printf ("%x,%o,%d,%u", d,d,d,d);    printf ("\ n");    c format characters, output a character char e = ' a ';        printf ("%c,%d", e,e);    printf ("\ n");    S-format character, used to output a string//char f[]= "China";//Prinf ("%s", f), #warning output string has a problem//f format character, used to output real numbers (including: single precision, double precision), Output in decimal form 1,%f format character, do not specify the width of the field, the system is automatically specified, so that the whole part of the output, and output 6 decimal places. Note: The number of outputsNot all the numbers in the word are valid digits, and the single-precision real number is usually 7 bits. The double-precision valid bit is 16 bits, giving the decimal 6 bits. float x,y;//x = 11111111.111;y=22222222,222;//printf ("%f \ n", x+y);    It can be seen from the results that only 7 bits are valid.    Double x, y;    x = 11111111.111;y=22222222.222;    printf ("%f \ n", x+y);    2,%M.NF, specify the output data for the Occupy M column, where the decimal bit n bit, if the value is greater than M, will be on the left no space.        3,%-m.nf and%m.nf are basically the same, just the value of the output to the left, the right side to fill the space. Symbol e, output in the form of an exponent//1,%e, does not specify the width of the output data, and the number of decimal places, and some C-compiler system automatically points out that the number is divided into 6 digits, the number of parts divided into 5 bits, (eg:+002) printf ("%e",    12389.454566);//And this system is the default stack of 4-bit printf ("\ n");    %m.ne and%-m.ne, m,n,-in the same way as in the front.    Double F = 123.456;    printf ("%e%10e%10.2e%.2e%-10.2e", f,f,f,f,f);    printf ("\ n");    The format character G, which is used to output a real number, automatically chooses the F format or the e format double g = 123.456, depending on the size of the numbers;    printf ("%f%e%g", g,g,g);    printf ("\ n");    Double h = 1234567123.456;        printf ("%f%e%g", h,h,h); Note: A format character starts with a% and ends with one of the preceding formatting characters.    can be inserted in the middle of additional modifiers, in fact, is the ordinary character//printf ("c=%cf=%fs=%s", c,f,s),//actually f= is the ordinary character printf ("\ n");        Output% symbol printf ("%f%%", 1.0/3);    GetChar (); return 0;}

The following is a picture of some of the corresponding format symbols output: output

The following is the use of the escape character "\"

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Use in printf (C language)