100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#define STACK_SIZE 10
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struct stack {
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float values[STACK_SIZE];
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int size;
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};
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void print_stack(struct stack* s) {
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for (int i = 0; i < s->size; i++) {
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printf("%.2f", s->values[i]);
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if (i < s->size - 1) {
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printf(" ");
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} else {
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printf(" ");
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}
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}
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printf("\n");
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}
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void push_stack(struct stack* s, float value) {
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if (s->size >= STACK_SIZE) {
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printf("Chyba: zasobnik je plny\n");
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exit(0);
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}
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s->values[s->size++] = value;
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}
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float pop_stack(struct stack* s) {
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if (s->size == 0) {
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printf("Chyba: zasobnik je prazdny\n");
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exit(0);
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}
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return s->values[--s->size];
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}
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int is_operator(char* input) {
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return (strcmp(input, "+") == 0 || strcmp(input, "-") == 0 ||
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strcmp(input, "*") == 0 || strcmp(input, "/") == 0);
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}
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void perform_operation(struct stack* s, char* operator) {
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if (s->size < 2) {
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printf("Chyba: nedostatok operandov\n");
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exit(0);
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}
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float b = pop_stack(s);
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float a = pop_stack(s);
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float result;
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if (strcmp(operator, "+") == 0) {
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result = a + b;
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} else if (strcmp(operator, "-") == 0) {
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result = a - b;
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} else if (strcmp(operator, "*") == 0) {
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result = a * b;
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} else if (strcmp(operator, "/") == 0) {
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if (b == 0) {
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printf("division by zero\n");
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exit(0);
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}
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result = a / b;
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} else {
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printf("Chyba: neplatna operacia\n");
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exit(0);
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}
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push_stack(s, result);
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}
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int main() {
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char input[100];
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struct stack mystack;
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mystack.size = 0;
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while (fgets(input, sizeof(input), stdin) != NULL) {
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input[strlen(input) - 1] = '\0';
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float value;
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if (sscanf(input, "%f", &value) == 1) {
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push_stack(&mystack, value);
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} else if (is_operator(input)) {
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perform_operation(&mystack, input);
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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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print_stack(&mystack);
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}
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printf("no input\n");
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return 0;
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}
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