lab6

#include <stdio.h>
#include <math.h>
double f1(int);
int f2(void);
int f3(void);
int main() {
    int(*ptr)(void);
    ptr = f2;
    ptr();
    ptr = f3;
    ptr();

    int(*ptMas[])(void) = { f2, f3 };
    ptMas[0]();
    ptMas[1]();
    int mas[3] = { (int)f1, (int)f2, (int)f3 };
    double (*pt1)(int);
    pt1 = (double(*)())mas[0];
    double m = pt1(0);
    printf("\nm= %f", m);
    for (int i = 1; i < 3; i++) {
        ptr = (int(*)())mas[i];
        ptr();
    }
    printf("\n\n");
    double(*ppf)(double);
    ppf = sin;
    printf("sin(0.5) = %f\n", ppf(0.5));
    ppf = cos;
    printf("cos(0.5) = %f\n", ppf(0.5));

    return 0;
}
double f1(int a) {
    printf("\ndouble f1(int a)");
    double b = a;
    if (a == 0) return b + 1.0;
    else return 1.0 / b;
}
int f2()
{
    printf("\nint f2(void)");
    return 200;
}
int f3() {
    printf("\nint f3(void)");
    return 300;
}