/* fichero numeros.c */
#include <stdio.h>
#define  SIZE 20
double media(double*, int);
double maximo(double*, int);
double minimo(double*, int);
double semisuma(double, double);
void main(void)
{
    double vector[SIZE];
    int n, i;
    printf("¨Con cuántos valores desea trabajar?\n");
    printf("(el número deberá ser menor de 20)\n");
    printf("n: ");
    scanf("%d", &n);
    printf("\n");
    printf("Introduzca los %d valores:\n",n);
    for (i=0 ;i<n; i++) { 
        printf("Valor %d: ", i + 1);
        scanf("%lf", &vector[i]);
    }
    printf("\n");
    printf("media= %5.2lf \n", media(vector,n));
    printf("maximo= %5.2lf \n", maximo(vector,n));
    printf("minimo= %5.2lf \n", minimo(vector,n));
    printf("semisuma= %5.2lf \n",
        semisuma(maximo(vector, n), minimo(vector, n)));
}
double media(double* valores, int num)
{
    double suma=0.0, med;
    int i;
    for (i=0; i<num ;i++)
        suma += valores[i];
    med = suma/num;
    return (med);
}
double minimo(double* valores, int num)
{
    int i;
    double min;
    min = valores[0];
    for (i=1; i<num ;i++)
        if (valores[i] < min)
            min = valores[i];
    return (min);
}
double maximo(double* valores, int num)
{
    int i;
    double max;
    max= valores[0];
    for (i=1; i<num ;i++)
        if (valores[i] > max)
            max = valores[i];
    return (max);
}
double semisuma(double max, double min)
{
    double semi;
    semi = (max+min)/2.0;
    return(semi);
}