Lista 3 - Exercício 33

#include <stdio.h>
#include <math.h>

int main()
{
    int i = 2,j,ntimes,counter = 1;
    float series = 1,var,fat = 1;
    char opt;

    printf("Entre com a operação desejada :\nc - Cosseno\ns - Seno\ne - Exponencial\n\n");
    opt = getche();
    printf("\nEntre com a variavel :\n");
    scanf("%f",&var);
    printf("Entre com a quantidade de termos desejada :\n");
    scanf("%d",&ntimes);

    switch(opt)
    {
        case 'c':
        while (ntimes>0)
        {
            for (j = i; j > 1; j--)
            {
                fat = fat*j;
            }
            printf("%f\n",pow(var,i));
            series = series + ((pow(-1,counter)*(pow(var,i)))/fat);
            counter++;
            i = i + 2;
            ntimes--;
            fat = 1;
        }
        printf("O valor da serie do Cosseno eh igual a %f\n",series);
        break;

        case 's':
        while (ntimes>0)
        {
            for (j = i; j > 0; j--)
            {
                fat = fat*(j+1);
            }
            series = series + ((pow(-1,counter)*(pow(var,i+1)))/fat);
            counter++;
            i = i+2;
            ntimes--;
            fat = 1;
        }
        printf("O valor da serie do Seno eh igual a %f\n",series);
        break;

        case 'e':
        for (i = 0; i < ntimes; i++)
        {
            for (j = i; j > 0; j++)
            {
                fat = fat*j;
            }
            series = series + ((pow(var,i))/fat);
            fat = 1;
        }
        printf("O valor da serie exponencial eh igual a %f\n",series);

        default:
        printf("Entrada invalida!\n");
    }
    return 0;
}