Lista 7 - Exercício 8

#include <stdio.h>
#define ITER 50
#define PI 3.141592

void menuGen(void);
float coss(float angle);
float sen(float angle);
float radConvert (float angle);

int main() {

    int option;
    float angle,ans,angleRad;

    menuGen();
    scanf("%d",&option);
    printf("Entre com o angulo, em graus:\n");
    scanf("%f",&angle);

    angleRad = radConvert(angle);
    switch(option) {
        case 1:
            ans = sen(angleRad); break;
        case 2:
            ans = coss(angleRad); break;
        case 3:
            ans = sen(angleRad)/coss(angleRad); break;
        default:
            printf("Opcao invalida!\n");
    }

    printf("Resultado : %f\n",ans);
    return 0;
}

void menuGen(void) {

    printf("-----------------------------------\n");
    printf("Escolha a funcaoo trigonometrica :\n1 - seno\n2 - cosseno\n3 - tangente\n");
    printf("-----------------------------------\n");
}

float radConvert (float angle) {

    return (angle*PI/180);
}
float sen(float angle) {
    float num = angle*angle*angle, fat = 6, sen = angle;
    int i,j = 3, k = 4, sinal = 1;

    for (i = 1; i <= ITER; i++) {
        sinal = (-1)*sinal;
        sen = sen + (sinal*num)/fat;
        fat = fat*(i+j)*(i+k);
        num = num*angle*angle;
        j++;
        k++;
    }

    return sen;
}


float coss(float angle) {

    float num = 1, fat = 2, coss = 1;
    int i,j = 2, k = 3, sinal = 1;

    for (i = 1; i <= ITER; i++) {
        sinal = (-1)*sinal;
        num = num*angle*angle;
        coss = coss + (sinal*num)/fat;
        fat = fat*(i+j)*(i+k);
        j++;
        k++;
    }

    return coss;
}