usaa24/cv3/program.c

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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
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#include <ctype.h>
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#include <string.h>
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#define MAX_VELKOST 10
typedef struct {
float zasobnik[MAX_VELKOST];
int vrchol;
} KalkulackaZasobnik;
void inicializuj(KalkulackaZasobnik *kalkulacka) {
kalkulacka->vrchol = -1;
}
bool vloz(KalkulackaZasobnik *kalkulacka, float hodnota) {
if (kalkulacka->vrchol >= MAX_VELKOST - 1) {
return false;
}
kalkulacka->zasobnik[++kalkulacka->vrchol] = hodnota;
return true;
}
bool vyber(KalkulackaZasobnik *kalkulacka, float *a, float *b) {
if (kalkulacka->vrchol < 1) {
return false;
}
*a = kalkulacka->zasobnik[kalkulacka->vrchol--];
*b = kalkulacka->zasobnik[kalkulacka->vrchol--];
return true;
}
bool scitat(KalkulackaZasobnik *kalkulacka) {
float a, b;
if (vyber(kalkulacka, &a, &b)) {
return vloz(kalkulacka, b + a);
}
return false;
}
bool odcitat(KalkulackaZasobnik *kalkulacka) {
float a, b;
if (vyber(kalkulacka, &a, &b)) {
return vloz(kalkulacka, b - a);
}
return false;
}
bool nasobit(KalkulackaZasobnik *kalkulacka) {
float a, b;
if (vyber(kalkulacka, &a, &b)) {
return vloz(kalkulacka, a * b);
}
return false;
}
bool delit(KalkulackaZasobnik *kalkulacka) {
float a, b;
if (vyber(kalkulacka, &a, &b)) {
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if (a == 0) {
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return false;
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}
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return vloz(kalkulacka, b / a);
}
return false;
}
void zobraz_zasobnik(KalkulackaZasobnik *kalkulacka) {
for (int i = 0; i <= kalkulacka->vrchol; i++) {
printf("%.2f ", kalkulacka->zasobnik[i]);
}
printf("\n");
}
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bool je_platna_operacia(char operacia) {
return operacia == '+' || operacia == '-' || operacia == '*' || operacia == '/';
}
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bool je_platne_cislo(const char *vstup) {
char *koniec;
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strtof(vstup, &koniec);
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return *koniec == '\n' || *koniec == '\0';
}
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int main() {
KalkulackaZasobnik kalkulacka;
inicializuj(&kalkulacka);
char vstup[100];
while (true) {
fgets(vstup, sizeof(vstup), stdin);
if (vstup[0] == '\n') {
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break;
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}
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if (je_platne_cislo(vstup)) {
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float hodnota = strtof(vstup, NULL);
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vloz(&kalkulacka, hodnota);
zobraz_zasobnik(&kalkulacka);
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}
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else if (strlen(vstup) == 2 && je_platna_operacia(vstup[0])) {
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char operacia = vstup[0];
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switch (operacia) {
case '+':
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if (scitat(&kalkulacka)) {
zobraz_zasobnik(&kalkulacka);
} else {
printf("no input\n");
return 0;
}
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break;
case '-':
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if (odcitat(&kalkulacka)) {
zobraz_zasobnik(&kalkulacka);
} else {
printf("no input\n");
return 0;
}
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break;
case '*':
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if (nasobit(&kalkulacka)) {
zobraz_zasobnik(&kalkulacka);
} else {
printf("no input\n");
return 0;
}
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break;
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case '/': {
float a, b;
if (vyber(&kalkulacka, &a, &b)) {
if (a == 0) {
printf("division by zero\n");
return 0;
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} if else {
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vloz(&kalkulacka, b / a);
zobraz_zasobnik(&kalkulacka);
}
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else{
printf("not enough operands\n");
}
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} else {
printf("no input\n");
return 0;
}
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break;
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}
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}
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} else {
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printf("bad input\n");
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return 0;
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}
}
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return 0;
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}