Cles types de programmation type non signé de variable de size_t stockant les tailles des objets dans des résultats de magasin de time_t de bytes du clock_t de fonction de temps () stockent des résultats du DOSSIER de fonction d'horloge () accédant à un sig_atomic_t Jmp_buf de wchar_t de va_list de fpos_t de ldiv_t de div_t de ptrdiff_t de jet (habituellement un dossier ou un dispositif)

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Types pour un but particulier utilisés généralement :

Type variable

Description

size_t

type non signé utilisé pour stocker les tailles des objets en bytes

time_t

stockaient des résultats de la fonction de temps ()

clock_t

stockaient des résultats de la fonction d'horloge ()

DOSSIER

utilisé pour accéder à un jet (habituellement un dossier ou un dispositif)

ptrdiff_t

type signé de la différence entre 2 indicateurs

div_t

stockaient des résultats de la fonction de division ()

ldiv_t

stockaient des résultats de fonction de ldiv ()

fpos_t

tenaient l'information de position de dossier

va_list

utilisé dans la manipulation variable d'argument

wchar_t

type de caractère large (utilisé pour les jeux de caractères prolongés)

sig_atomic_t

utilisé dans des traiteurs de signal

Jmp_buf

utilisé pour des sauts non-local


Pour comprendre mieux ces variables nous ont laissés prendre un exemple :

/* Programme pour dire la gamme et la taille en bytes de la variable de C */

#include <stdio.h>

int main()
{
int a; /* simple integer type */
long int b; /* long integer type */
short int c; /* short integer type */
unsigned int d; /* unsigned integer type */
char e; /* character type */
float f; /* floating point type */
double g; /* double precision floating point */

a = 1023;
b = 2222;
c = 123;
d = 1234;
e = 'X';
f = 3.14159;
g = 3.1415926535898;

printf( "\nA char is %d bytes", sizeof( char ));
printf( "\nAn int is %d bytes", sizeof( int ));
printf( "\nA short is %d bytes", sizeof( short ));
printf( "\nA long is %d bytes", sizeof( long ));

printf( "\nAn unsigned char is %d bytes",
sizeof( unsigned char ));

printf( "\nAn unsigned int is %d bytes",
sizeof( unsigned int ));

printf( "\nAn unsigned short is %d bytes",
sizeof( unsigned short ));

printf( "\nAn unsigned long is %d bytes",
sizeof( unsigned long ));

printf( "\nA float is %d bytes", sizeof( float ));

printf( "\nA double is %d bytes\n", sizeof( double ));

printf("a = %d\n", a); /* decimal output */
printf("a = %o\n", a); /* octal output */
printf("a = %x\n", a); /* hexadecimal output */
printf("b = %ld\n", b); /* decimal long output */
printf("c = %d\n", c); /* decimal short output */
printf("d = %u\n", d); /* unsigned output */
printf("e = %c\n", e); /* character output */
printf("f = %f\n", f); /* floating output */
printf("g = %f\n", g); /* double float output */

printf("\n");

printf("a = %d\n", a); /* simple int output */
printf("a = %7d\n", a); /* use a field width of 7 */
printf("a = %-7d\n", a); /* left justify in
field of 7 */

c = 5;
d = 8;

printf("a = %*d\n", c, a); /* use a field width of 5*/
printf("a = %*d\n", d, a); /* use a field width of 8 */

printf("\n");

printf("f = %f\n", f); /* simple float output */
printf("f = %12f\n", f); /* use field width of 12 */
printf("f = %12.3f\n", f); /* use 3 decimal places */
printf("f = %12.5f\n", f); /* use 5 decimal places */
printf("f = %-12.5f\n", f); /* left justify in field */

return 0;
}

Sample Chapters from book DATA RECOVERY WITH AND WITHOUT PROGRAMMING by Author Tarun Tyagi
Data Recovery with & without Programming


Publishers of the Book
Number of Pages
ISBN
Price of the Book


BPB Publications, New Delhi, India
540
81-7656-922-4
$69.00 (Including Shipping Charges, Cost of Book and Other expenses, Free Source Code CD included with the Book)





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