rand 函数 c args

Question

I have a multi task application based on DTW(Dynamic Time Wrapping) that has this code line:

void randPattern(int in[SIZE][SIZE]){
    int i,j;

    for(i=0; i<SIZE; i++){
        for(j=0; j<SIZE; j++){
            in[i][j] = abs(rand(23, 2, 100)%5000);
        }
    }
}

So, when i tried to compile with "arm-none-eabi-gcc" this returns:

error: too many arguments to function 'rand'

What i can do to solve this message or what i can use instead this function. If someone have an explanation... Thanks for attention

Answer 1

As explained in this article from cplusplus.com , the rand function has the following prototype:

int rand (void);

and you get an int between 0 and RAND_MAX . You must pass no argument to the function.

By the way, don't forget to initialize the function at the begginning of your program by calling :

srand (time(NULL));

If you need to choose a random element from an array, this question may be the right place to look for.