Use of EOF in vectors

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Use of EOF in vectors

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#1 by (1 votes)
#2 by (0 votes)

-1

Good night, I would like to know if in this program I am using EOF (end of file) right, that is, as long as I do not type 0, the vector is being allocated and recorded with a value ?? Here is the code below:

#include <stdio.h>
#include <stdlib.h>

int main (void)
{
    int i,j, counter = 1,mediaaritmetica, novasequencia;
    int* sequencia = NULL;

    while (scanf(%d), &sequencia[i] != EOF)
    {
        sequencia = (int*) realloc(sequencia, counter * sizeof(int));
        scanf("%d", &sequencia[i]);
        counter++
    }   

    for (j = 0; j < counter ; j++)
    {
        mediaartimetica += sequencia[j];
    }

    mediaaritmetica = mediaartimetica/counter - 1;

    for ( k = 2, k < counter ; k++)
    {
        novasequencia = pow(sequencia[k], 2)/mediaaritmetica * (sequencia[k - 2] + sequencia[k -1] + sequencia[k])
        printf(".4%d\n", novasequencia);
    }

    return 0;
}

c

asked by anonymous 16.05.2015 / 05:49

2 answers

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score 1 · Answer 1

Some notes:

% with% error of quotes and parentheses

while (scanf(%d), &sequencia[i] != EOF) you are for the car ahead of the oxen

use sequencia = NULL; /* ... */ &sequencia[i] without assigning value

i needs parenthesis

mediaaritmetica = mediaartimetica/counter - 1; needs pow() . But you can do the same by multiplying the value: <math.h>

different identifiers !!! sequencia[k] * sequencia[k] and mediaaritmetica

score 0 · Answer 2

The EOF is only used when moving files, just as the name already says End Of File , end of file, not vector.

Beginning with its while , scanf is a method that for reading information and sequencia[i] does not yet exist, and conditions in while out any other structure separates with && or || (this is in C, C ++, etc). The correct thing is to have a variable to collect the value of scanf and through it check the input.

int in = 1;
sequencia = (int*) malloc(0);
// continua enquanto 'in' diferente de '0'
while(in != 0){
    scanf("%i", &in);                     // counter deve iniciar em 0 para
                                          // não ter problema no for abaixo.
    sequencia = (int*) realloc(sequencia, (couter + 1)*sizeof(int));
    sequencia[counter] = in;
    counter++;
}

Another thing, first of a malloc in sequencia .

Your average has to have parentheses in counter - 1 to remove one before the division.

mediaaritmetica = mediaartimetica/(counter - 1);

And finally, you should declare k before using it in for .

int k;
for ( k = 2, k < counter ; k++){

and all other variables start with 0, because when a variable is created, the compiler inserts value garbage into them.

int i,j, counter = 1,mediaaritmetica=0, novasequencia=0;