GLIN202/TP5-6

// tp56.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <math.h>

int identiques (int *a, int *b);
int valeursIidentiques (int *a, int *b);
void echange (int *a, int *b);
void saisieTemps(int *heures, int *minutes, int *secondes);
int tempsValide(int *heures, int *minutes, int *secondes);

float discriminant(float a, float b, float c);
int nmbreRacines(float a, float b, float c);

int resolutionEqua2ndDegre(float a, float b, float c, float *x1, float *x2);

void onePGCDstep(int *a, int *b);
int pgcd(int a, int b);


int _tmain(int argc, _TCHAR* argv[])
{
    int a, b;

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

    printf("pgcd(%d, %d) = %d\n", a, b, pgcd(a, b));

    scanf("\n");
    return 0;
}

int identiques (int *a, int *b)
{
    if (a == b)
        return 1;
    else
        return 0;
}

int valeursIidentiques (int *a, int *b)
{
    printf("pendant a : %d\n", *a);
    printf("pendant a : %d\n", *b);
    if (*a == *b)
        return 1;
    else
        return 0;
}

void echange (int *a, int *b) {
    int t = *a;
    *a = *b;
    *b = t;
}

void saisieTemps(int *heures, int *minutes, int *secondes)
{
    do {
        printf("hh:mm:ss : ");
        scanf("%d:%d:%d", heures, minutes, secondes);
    } while (!tempsValide(heures, minutes, secondes));
}

int tempsValide(int *heures, int *minutes, int *secondes)
{
    if (*secondes < 0 || *secondes > 60)
        return 0;
    if (*minutes < 0 || *minutes > 60)
        return 0;
    if (*heures < 0)
        return 0;

    return 1;
}

float discriminant(float a, float b, float c)
{
        return b*b - 4*a*c;
}

int nmbreRacines(float a, float b, float c)
{
        float discrim = discriminant(a, b, c);
        if (discrim > 0.) {
                return 2;
        } else if (discrim == 0.) {
                return 1;
        } else {
                return 0;
        }
}

int resolutionEqua2ndDegre(float a, float b, float c, float *x1, float *x2)
{
    float discri = discriminant(a, b, c);

    switch (nmbreRacines(a, b, c)) {
    case 2:
            *x1 = (-b-sqrt(discriminant(a, b, c))) / (2*a);
            *x2 = (-b+sqrt(discriminant(a, b, c))) / (2*a);
            return 2;
            break;
    case 1:
            *x1 = -b/(2.*a);
            *x2 = *x1;
            return 1;
            break;
    default:
            *x1 = -1.;
            *x2 = -1.;
            return 0;
            break;
    }
}

void onePGCDstep(int *a, int *b)
{
    int t = *b;
    *b = *a % t;
    *a = t;
}

int pgcd(int a, int b)
{
    int c = a;
    int d = b;
    while (d > 0) {
        onePGCDstep(&c, &d);
    }
    return c;
}