Function with vectors in C [closed]

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Function with vectors in C [closed]

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#1 by (2 votes)

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I would like to know how a function in C would receive a vector with N elements and return the number of elements that are above the arithmetic mean of the vector itself.

c

asked by anonymous 27.09.2017 / 14:12

1 answer

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score 2 · Answer 1

Here is a (tested) example of how to compute the quantidade de elementos contained in a vector that is acima da média aritmética of that same vector.

For more readability, clarity and modularity of the code, divide the task into two functions: one of them double media( double vetor[], int tam ) calculates the arithmetic mean of the elements in one vector, while the other int media_qtd_acima( double vetor[], int tam ) counts how many elements are above of the average:

#include <stdio.h>

double media( double vetor[], int tam )
{
    int i = 0;
    double soma = 0.0;

    for( i = 0; i < tam; i++ )
        soma += vetor[ i ];

    return soma / tam;
}

int media_qtd_acima( double vetor[], int tam )
{
    int i = 0;
    int n = 0;
    double med = media( vetor, tam );

    for( i = 0; i < tam; i++ )
        if( vetor[i] > med )
            n++;

    return n;
}

int main( void )
{
    double v[ 10 ] = { 5.03, 5.7, 2.89, 1.97, 1.04, 3.3, 7.8, 9.12, 0.08, 8.41 };

    printf( "Media: %g\n", media( v, 10 ) );
    printf( "Qtd. de amostras acima da media: %d\n", media_qtd_acima( v, 10 ) );

    return 0;
}

Output:

./media 
Media: 4.534
Qtd. de amostras acima da media: 5