В одномерном массиве, состоящем из n вещественных элементов, вычислить сумму элементов массива

 #include  

#include  

 

#define RAND(min, max) (rand() % ((max) - (min)) + (min)) 

#define LEFT 100 

#define RIGTH (LEFT * 10) 

 

void random_fill(double* box, size_t length)  

{ 

    size_t i = 0; 

     

    if (box == NULL || 0 == length)  

    { 

        return; 

    } 

     

    do  

    { 

        box[i] = RAND(LEFT, RIGTH) / 10.0; 

    }  

    while (++i < length); 

} 

 

double* create(double* box, size_t length)  

{ 

    if (box != NULL)  

    { 

        free(box); 

    } 

     

    box = (double*)malloc(length * sizeof(double)); 

    random_fill(box, length); 

     

    return box; 

} 

 

double* destroy(double* box) 

{ 

    if (box != NULL) 

    { 

        free(box); 

        box = NULL; 

    } 

     

    return box; 

} 

 

void show(double* box, size_t length) 

{ 

    size_t i = 0; 

     

    if (box == NULL || 0 == length) 

    { 

        return; 

    } 

     

    do 

    { 

        printf(" %.1lf ", box[i]); 

    } 

    while (++i < length); 

    puts(""); 

} 

 

double sum(double* begin, double* end) 

{ 

    double s = 0.0; 

     

    if (begin && end && begin < end)  

    { 

        do 

        { 

            s += *begin; 

        } 

        while (++begin != end); 

    } 

     

    return s; 

} 

 

int main(void) { 

    size_t n; 

    double* box = NULL; 

    double s; 

     

    printf("n: "); 

    scanf("%zu", &n); 

     

    box = create(box, n); 

    show(box, n); 

    s = sum(box + 1, box + n - 1); 

     

    printf("sum: %.1lf\n", s); 

     

    destroy(box); 

     

    return 0; 

}