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

void info(){
    printf("171RDB133\n");
    printf("Lauris Štekels\n");
    printf("7.grupa\n");
}

float calcA(float x) {
    return logf(2 * x - 3);
}

float calcB(float x) {
    return (4 * x) / (x * x - 9);
}

void function1(float a, float b) {
    float result = logf(fabsf(b) - sqrtf(a));
    printf("%.3f\n", result);
}

void function2(float a, float b) {
    float result = ((a + 1) / 10) - 18 * a * b;
    printf("%.3f\n", result);
}

void mainTask() {
    int validation, trash;
    float x, a, b;

    printf("Ievadiet x: ");

    validation = scanf("%f", &x);
    trash      = scanf("%c", &x);

    if (validation != 1) {
        printf("Invalid input!\n");
    } else {
        a = calcA(x);
        b = calcB(x);
        a < fabsf(b) ? function1(a, b) : function2(a, b);
    }

}

int main() {
    info();
    char cont = 'y';
    while (strcasecmp(&cont, "y") == 0) {
        mainTask();
        printf("Continue? (y or Y)\n");
        scanf("%s", &cont);
    }
    return 0;
}