C dat veranderlijk types size_t niet ondertekend type programmeert dat de grootte van voorwerpen in bytes opslaat time_t slaat resultaten van de de opslagresultaten van de tijd() functie clock_t van op het klok ()- functiedossier dat tot een stroom toegang heeft (gewoonlijk een dossier of een apparaat) ptrdiff_t div_t ldiv_t fpos_t va_list wchar_t sig_atomic_t Jmp_buf

De types voor speciale doeleinden gebruikten algemeen:

Om deze variabelen beter te begrijpen nemen een voorbeeld:

/* Programma om de waaier en de grootte in bytes van de variabele van C te vertellen */

#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;
}

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