#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include "Header.h"

int main() {
    double dFrom, dTo, y;
    int i, j, iNumber;
    char sAnswer[256];
    char sAgree[] = "Yes";
    struct Func {
        double (*pFunc)(double);
        const char *fname;
    } funcs[] = { {sin, "sin(x)"}, {cos, "cos(x)"}, {tan, "tg(x)"}, {sinh, "sh(x)"},
    {cosh, "ch(x)"}, {SinPlusCos, "sin(x)+cos(x)"} };
    double res[3] = { 0, 0, 0 };
    for (i = 0; i < 6; i++) {
        printf("%d: %s\n", i, funcs[i].fname);
    }
    for (;;) {
        printf("Choose the function: \n");
        scanf_s("%d", &iNumber);
        if ((iNumber >= 0) & (iNumber < (sizeof(funcs) / sizeof(struct Func)))) {
            printf("From: \n");
            scanf_s("%lf", &dFrom);
            printf("To: \n");
            scanf_s("%lf", &dTo);
            y = NumericIntegral(funcs[iNumber].pFunc, dFrom, dTo, 1e-6);
            printf("Integral_of_%s from: %.3f to: %.3f = %lf \n", funcs[iNumber].fname, dFrom, dTo, y);
            printf("Do you want to continue? \n");
            for (;;) {
                fgets(sAnswer, sizeof(sAnswer), stdin);
                if (sAnswer[0] != '\n')break;
            }
            if (tolower(sAnswer[0]) == tolower(sAgree[0]))
                continue;
            else break;
        }
        else printf("We haven\'t added such a function yet. Please, try again. ");
    }
    return 0;

}