usaa24/cv3/program.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#define STACK_SIZE 10
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struct stack {
float values[STACK_SIZE];
int size;
};
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void init_stack(struct stack* s) {
memset(s, 0, sizeof(struct stack));
}
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void push_stack(struct stack* s, float value) {
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assert(s->size < STACK_SIZE);
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s->values[s->size] = value;
s->size += 1;
}
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float pop_stack(struct stack* s) {
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assert(s->size > 0);
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s->size -= 1;
return s->values[s->size];
}
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void print_stack(struct stack* s) {
for (int i = 0; i < s->size; i++) {
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printf("%.2f ", s->values[i]);
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}
printf("\n");
}
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int main() {
struct stack mystack;
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init_stack(&mystack);
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char input[256];
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int has_input = 0;
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while (1) {
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printf("Zadajte číslo alebo operáciu (+, -, *, /): ");
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if (!fgets(input, sizeof(input), stdin)) {
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break;
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}
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input[strcspn(input, "\n")] = 0;
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char* endptr;
float value = strtof(input, &endptr);
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if (endptr != input) {
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push_stack(&mystack, value);
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has_input = 1;
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print_stack(&mystack);
continue;
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}
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if (strcmp(input, "+") == 0) {
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if (mystack.size < 2) {
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printf("Chyba: Nedostatok hodnôt v zásobníku.\n");
break;
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}
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float b = pop_stack(&mystack);
float a = pop_stack(&mystack);
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push_stack(&mystack, a + b);
print_stack(&mystack);
} else if (strcmp(input, "-") == 0) {
if (mystack.size < 2) {
printf("Chyba: Nedostatok hodnôt v zásobníku.\n");
break;
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}
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float b = pop_stack(&mystack);
float a = pop_stack(&mystack);
push_stack(&mystack, a - b);
print_stack(&mystack);
} else if (strcmp(input, "*") == 0) {
if (mystack.size < 2) {
printf("Chyba: Nedostatok hodnôt v zásobníku.\n");
break;
}
float b = pop_stack(&mystack);
float a = pop_stack(&mystack);
push_stack(&mystack, a * b);
print_stack(&mystack);
} else if (strcmp(input, "/") == 0) {
if (mystack.size < 2) {
printf("Chyba: Nedostatok hodnôt v zásobníku.\n");
break;
}
float b = pop_stack(&mystack);
float a = pop_stack(&mystack);
if (b == 0) {
printf("Chyba: Delenie nulou.\n");
break;
}
push_stack(&mystack, a / b);
print_stack(&mystack);
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} else {
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printf("Chyba: Neplatný vstup.\n");
break;
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}
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}
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if (has_input) {
printf("\n");
} else {
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printf("no input\n");
}
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return 0;
}