C Language, data type

#include <stdio.h>void F0 (void) {printf ("in linux:\n");            printf ("sizeof (char) =%d\n", sizeof (char));            printf ("sizeof (int) =%d\n", sizeof (int));        printf ("sizeof (short int) =%d\n", sizeof (short int));                 printf ("sizeof (long int) =%d\n", sizeof (long int));            printf ("sizeof (float) =%d\n", sizeof (float));           printf ("sizeof (double) =%d\n", sizeof (double));        printf ("sizeof (long double) =%d\n", sizeof (long double));    }void F1 (void) {int i = 1;    unsigned int ui = 1;    char c = 1;    unsigned char UC = 1;    short int si = 1;    unsigned short int usi = 1;    float f = 1;    Double d = 1;        Long double ld = 1;      printf ("for 1, i =%x, UI =%x\n", I, UI);     printf ("for 1, C =%x, UC =%x\n", c, UC);    printf ("for 1, si =%x, usi =%x\n", si, USI);    printf ("for 1, F =%x\n", f);    printf ("for 1, D =%x\n", d);      printf ("for 1, ld =%x\n", LD);    }void F2 () {int i =-1; unsigned int ui =-1;    char C =-1;    unsigned char UC =-1;    short int si =-1;    unsigned short int usi =-1;    float f =-1;    Double d =-1;        Long double ld =-1;      printf ("for-1, I =%x, UI =%x\n", I, UI);     printf ("for-1, C =%x, UC =%x\n", c, UC);    printf ("for-1, si =%x, usi =%x\n", si, USI);    printf ("for-1, F =%x\n", f);    printf ("for-1, D =%x\n", d);            printf ("for-1, ld =%x\n", LD);    c =-255;    UC =-255;        printf ("for-255, C =%x, UC =%x\n", c, UC);    c =-128;    UC =-128; printf ("for-128, C =%x, UC =%x\n", c, UC);}    void F_show1 (void) {printf ("For-1,f_show1:uint =%x\n", (unsigned int)-1);    printf ("For-1,f_show1:int =%x\n", (int)-1);        printf ("For-1,f_show1:c =%x\n", (char)-1);        printf ("For-1,f_show1:uc =%x\n", (unsigned char)-1); printf ("For-1,f_show1:uc =%d\n", (unsigned char)-1);}    int main () {F0 ();        F_show1 ();    F1 ();        F2 (); return 0;} /*[email protected]:/work/dcc# GCC 1.c;./a.out in linux:sizeof (char) = 1sizeof (Int.) = 4sizeof (short int) = 2sizeof (long int) = 4sizeof (float) = 4sizeof (double) = 8sizeof (long double) = 12
Here is a description of the integer constants in the Linux system. means for-1,f_show1:uint = Fffffffffor-1,f_show1:int = Fffffffffor-1,f_show1:c = Fffffffffor-1,f_show1:uc = Fffor-1 , F_show1:uc = 255for 1, i = 1, ui = 1for 1, c = 1, UC = 1for 1, si = 1, usi = 1for 1, f = 0for 1, d = 0for 1, ld = 0for- 1, i = ffffffff, UI = fffffffffor-1, c = ffffffff, UC = fffor-1, si = ffffffff, usi = fffffor-1, F = 0for-1, d = 0for -1, ld = 0for-255, c = 1, UC = 1for-128, c = ffffff80, UC = 80*/

　　

C Language, data type