How many elements does an array have?

Question

I have a array of 10 positions which is filled through a function,

ARMultiEachMarkerInfoT marcadoresVisiveis[10];

always before adding elements to the array, the function clears all elements and fills again. I want to know how best to count how many elements the array has, tried something like: count how many non-null elements the array has and increments a counter but was unsuccessful.

Follows the function:

void ReposicionaObjetos(){
    int i;

    //Limpa o array
    memset(marcadoresVisiveis, 0, sizeof marcadoresVisiveis);

    //Preenche o array
    for( i = 0; i < config->marker_num; i++ ) {
        if( config->marker[i].visible >= 0 ){
            marcadoresVisiveis[i] = config->marker[i];
        }
    }

    //... Saber quantos elementos o array possui...
}

Answer 1

It would be something like that:

void ReposicionaObjetos(){
    int contaElementosValidos = 0;
    memset(marcadoresVisiveis, 0, sizeof marcadoresVisiveis);
    for int (i = 0; i < config->marker_num; i++) {
        if (config->marker[i].visible >= 0 ){
            marcadoresVisiveis[i] = config->marker[i];
            contaElementosValidos++;
        }
    }
    //faz o que precisa com contaElementosValidos
}

I put in the Github for future reference.

I have serious doubts whether this approach to clean up array and popular again is the correct, but as I did not give the context I can not talk much.