Thread: Random Time Delay

  1. #1
    Registered User
    Join Date
    May 2020
    Posts
    1

    Random Time Delay

    I want to put a delay in my code to wait for a random number of seconds before going forward. I'm new to C and coding in general so I tried to patch together two example functions I found (random and delay), but so far it's not working. This is what I have so far:

    Code:
    // generate a random number between 1 and 5
    int random() 
    { 
        int i; 
        for (i = 0; i < 1; i++) { 
            int num = (rand() % 
               (5 - 1 + 1)) + 1; 
            return num; 
        } 
    } 
      
    //wait x number of seconds
    void delay(int number_of_seconds) 
    { 
        // Converting time into milli_seconds 
        int milli_seconds = 1000 * number_of_seconds; 
      
        // Storing start time 
        clock_t start_time = clock(); 
      
        // looping till required time is not achieved 
        while (clock() < start_time + milli_seconds); 
    } 
      
    
    
    main(void) {
        init_elecanisms();
        
        
        while (1) {
            if (start==0){
                int t = random();       //t=random number betwen 1 and 5
                delay(t);               //delay for random number of seconds
                led = ON;
                LED2 = (p1 == 0) ? ON : OFF; 
                l1 = (SW3 == 0) ? ON : OFF; 
            }
        }    
    }

  2. #2
    Registered User
    Join Date
    May 2012
    Posts
    392
    [QUOTE=ninnymoggin;1296135]I want to put a delay in my code to wait for a random number of seconds before going forward. I'm new to C and coding in general so I tried to patch together two example functions I found (random and delay), but so far it's not working. This is what I have so far:

    Code:
    // generate a random number between 1 and 5
    int random() 
    { 
        int i; 
        for (i = 0; i < 1; i++) { 
            int num = (rand() % 
               (5 - 1 + 1)) + 1; 
            return num; 
        } 
    }
    strange random() function. If you want a random number on 1-5,
    just take (rand() % 5) + 1.

    Code:
    //wait x number of seconds
    void delay(int number_of_seconds) 
    { 
        // Converting time into milli_seconds 
        int milli_seconds = 1000 * number_of_seconds; 
      
        // Storing start time 
        clock_t start_time = clock(); 
      
        // looping till required time is not achieved 
        while (clock() < start_time + milli_seconds); 
    }
    THis is called busy idling. You sometimes need to do it. Fundamentally this code is correct, but the clock doesn't always tick
    in milliseconds. You need to use the constant CLK_TCK to
    get clock ticks per second.
    However it's better to use the system-defined Sleep() or
    usleep() function if you want to idle for a set period. It's not
    ANSI C, but it's provided for this purpose, and will almost certainly
    exist in some form on your particular platform.
    I'm the author of MiniBasic: How to write a script interpreter and Basic Algorithms
    Visit my website for lots of associated C programming resources.
    https://github.com/MalcolmMcLean


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