How not to show in the output the null positions of a vector?

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How do I prevent those gigantic numbers referring to the empty positions of my vector from appearing?

My code:

int main(int argc, char** argv) {

double notas[10];
double soma = 0, media = 0;
int i, P[10];
int j = 0, count = 0;

for(i=0;i<10;i++){
    printf("Digite %d: ", i);
    scanf("%lf", &notas[i]);
}

for(i=0;i<10;i++){
    if(notas[i] > 5){
        soma = soma + notas[i];
        count++;
    }
}
media = soma/ count;

for(i=0;i<10;i++){
    if(notas[i]>= media){
        P[j] = i;
        j++;
    }
}
    printf("%.2lf\n", media);


for(i=0;i<10;i++){
    printf("%d  ", P[i]);
}
return (EXIT_SUCCESS);
}

Exit:

Exemplo de saída

Curiosity: What are the names of these large numbers that appear?

c array

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1 answer

3

The final print is printing the 10 positions of the array of notes that were above average, can only print the amount of notes that were inserted there, that is, can only go up to j (bad name for variable since it does not indicate what it is). Another solution would only be to mark unused positions as invalid and then check if it is invalid (it could even mark the first invalid position and stop reading the others), but I don’t like this. I don’t even like wearing one anymore array fixed for this, but I understand the use in exercise. Maybe you have some logic problem too, but I can’t talk about it. Something like this:

#include <stdio.h>

int main(void) {
    double notas[10];
    for (int i = 0; i < 10; i++) {
        printf("Digite %d: ", i);
        scanf("%lf", &notas[i]);
    }
    int j = 0, count = 0;
    double soma = 0;
    for (int i = 0; i < 10; i++) {
        if (notas[i] > 5) {
            soma = soma + notas[i];
            count++;
        }
    }
    double media = soma / count;
    int P[10];
    for (int i = 0; i < 10; i++) {
        if (notas[i] >= media) {
            P[j] = i;
            j++;
        }
    }
    printf("%.2lf\n", media);
    for (int i = 0; i < j; i++) {
        printf("%d  ", P[i]);
    }
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.

The "big" numbers that appear is memory junk, since it is accessing positions of the array which were not initialized into the program he picks up whatever crap he had in his memory before its execution. In C the integral memory management has to be done manually.

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