lab 03 9.03.2018

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

int main()
{
    int i, x;
    int a, b, k;

    printf("a = ");
    scanf("%d",&a);
    printf("b = ");
    scanf("%d",&b);

    printf("k = ");
    scanf("%d",&k);

    x = rand()%(b + 1 - a) + a;
    printf("\n (x = %d)\n",x);

    int ok = 0;

    for (i=0; i<k; i++)
    {
        int guess;

        printf("Ghiciti numarul. ");
        scanf("%d",&guess);
        printf("\n");

        if (guess == x)
        {
            printf("Numar ghicit.");
            break;
            ok = 1;
        }
    }

    if (ok == 0)
        printf("\nNumarul nu a fost ghicit.");

    srand(time(NULL));

    return 0;
}

//////////////

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

int func(int m, int n, int (*f)(int))
{
    int i, sum = 0;

    for (i=m; i<=n; i++)
        sum = sum + f(i);

    return sum;
}

int f1(int x)
{
    return x*(x+1)/2;
}

int f2(int x)
{
    return 3*x*x + 7;
}

int f3(int x)
{
    if (x > 0)
        return 1;
    if (x < 0)
        return -1;
    return 0;
}

int main()
{
    printf("%d",func(1,3,f2));
    return 0;
}


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

void *cautare(void *val, void *tablou, int nr_elemente, int dim_el)
{
    int i, c = 0;
    char *pt = tablou;

    for (i=0; i<nr_elemente; i++)
        if (memcmp(val,pt + i*dim_el,dim_el) == 0)
            c++;

    return c;
}

int main()
{
    int v[] = {1,2,2,4,5};
    int a = 2;
    printf("%d",cautare(&a,v,5,sizeof(int)));
    return 0;
}