lab8.2.c

/* example8-2.c */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <assert.h>
#include <math.h>

void printVector(int* a, int n)
{
    int i;
    for (i = 0; i < n; i++)
    {
        printf("%2i:  %3i\n",i, a[i]);
    }
}

float v_sum(int* v, int n)
{
    float sum = 0;
    int i;
    for (i = 0; i < n; i++)
    {
        sum += v[i];
    }
    return sum;
}

float v_len(int* v, int n) {
    float sum = 0;
    int i;
    for (i = 0; i < n; i++)
    {
        sum += v[i] * v[i];
    }
    return sqrt(sum);
}

void freq_analysis(int* v, int n, int* f) {
    int i;
    for (i = 0; i < n; i++)
    {
        f[v[i]]++;
    }
}


int main()
{
    int vec[100];
    int vec_2[3] = {3, 4, 0};

    assert(v_sum(vec_2, 3) == 7.);
    assert(v_len(vec_2, 3) == 5.);

    /* seeding the random number generator: */
    srand(time(NULL));

    int i;
    for (i = 0; i < 100; i++)
    {
        vec[i] = rand() % 10 + 1;
    }

    printf("The vector is:\n");
    printVector(vec, 100);

    printf("frequency:\n");
    int freq[11] = {0};
    freq_analysis(vec, 100, freq);
    printVector(freq, 11);

    return EXIT_SUCCESS;
}

lab8.4.c

/* example8-4.c */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

void printVector(float* a, int n)
{
    int i;
    for (i = 0; i < n; i++)
    {
        printf("%2i:  %7.3f\n",i, a[i]);
    }
}

float v_sum(float* v, int n)
{
    float sum = 0;
    int i;
    for (i = 0; i < n; i++)
    {
        sum += v[i];
    }
    return sum;
}

float v_avg(float* v, int n) {
    float s = v_sum(v, n);
    return s / n;
}

float rand_float()
{
    return (((float)rand()) / ((float)RAND_MAX) - .5) * 4;
}

int main()
{
    float vec[100];

    /* seeding the random number generator: */
    srand(time(NULL));

    int i;
    for (i = 0; i < 100; i++)
    {
        /* generating a random floating point number between 0 and 1 */
        vec[i] = rand_float();
    }

    printf("The vector is:\n");
    printVector(vec, 100);
    printf("sum:%f\n", v_sum(vec, 100));
    printf("avg:%f\n", v_avg(vec, 100));

    return EXIT_SUCCESS;
}

lab8.c

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

int my_rand(int max_range) {
    return rand() % max_range + 1;
}

int main()
{
    int n, max_range = 10;
    scanf("%i %i", &n, &max_range);

    srand(time(NULL));

    int i;
    for (i = 1; i <= n; i++) {
        printf("%i\n", my_rand(max_range));
    }
    return 0;
}