Microchip Technology XC8 Standard Compiler (Workstation) SW006021-1 SW006021-1 ユーザーズマニュアル

®

DS52053B-page 342

 2012 Microchip Technology Inc.

#include <stdio.h>

#include <time.h>

    char * wday[] = {

        "Sunday", "Monday", "Tuesday", "Wednesday",

        "Thursday", "Friday", "Saturday"

};

void 

main (void)

{

    time_t clock;

    struct tm * tp;

    time(&clock);

    tp = localtime(&clock);

    printf("Today is %s\n", wday[tp->tm_wday]);

}

ctime()

, asctime(), time()

Returns a structure of type 

tm

.

The example will require the user to provide the time() routine as one cannot be 
supplied with the compiler. See time() for more detail.

#include <math.h>

 

double log (double f)

double log10 (double f)

The 

log()

 function returns the natural logarithm of 

f

. The function 

log10()

 returns the 

logarithm to base 10 of 

f

.

#include <math.h>

#include <stdio.h>

void 

main (void)

{

    double f;

    for(f = 1.0 ; f <= 10.0 ; f += 1.0)

        printf("log(%1.0f) = %f\n", f, log(f));

}

exp()

, pow()