time.h

[Ridhi]

unable to use time.h file 

i have used:

#include time.h in main.c

added time.h file from C:\Keil_v5\ARM\ARMCC\include\time.h

when i use 

time_t T = time(NULL);
srand(T);

but it throw error

.\_build\nrf52832_xxaa.axf: Error: L6218E: Undefined symbol time (referred from main.o).

[Ridhi]

pls help

[Ridhi]

gentle reminder

[Jørgen Holmefjord]

I already explained you why time() is not working.

You can get a random number from the RNG peripheral and pass this to srand() instead of the output from time().

[Ridhi]

i am asking how to use this srand() because srand() requires time.h file usage

[Jørgen Holmefjord]

srand() does not require use of time.h. srand() takes a seed argument, which can be any unsigned int number. time(0) is popularly used as seed to the function, as it in many cases generates a "random enough" number to give a random sequence of numbers from the pseudo-random function rand(). See the description of the srand() function on cplusplus.com.

I'm trying to tell you that you can use a random number from the RNG peripheral to pass as the seed to srand(), instead of the output from time(0).