126 lines
3.0 KiB
C
126 lines
3.0 KiB
C
#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#define MAX_RAZMER 10
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typedef struct {
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double chisla[MAX_RAZMER];
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int vershina;
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} StEk;
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void inicStEk(StEk* stek) {
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stek->vershina = 0;
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}
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int isEmpty(StEk* stek) {
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return stek->vershina == 0;
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}
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int isFull(StEk* stek) {
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return stek->vershina == MAX_RAZMER;
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}
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void push(StEk* stek, double chislo) {
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if (isFull(stek)) {
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printf("no input\n");
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exit(1);
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}
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stek->chisla[stek->vershina] = chislo;
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stek->vershina++;
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}
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double pop(StEk* stek) {
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if (isEmpty(stek)) {
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printf("no input\n");
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exit(1);
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}
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return stek->chisla[--stek->vershina];
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}
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int main() {
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StEk stek;
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inicStEk(&stek);
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char bufer[256];
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while (fgets(bufer, sizeof(bufer), stdin) != NULL) {
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char* konec;
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double chislo = strtod(bufer, &konec);
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if (chislo == 0 && strcmp(bufer, "0\n") != 0) {
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printf("bad input\n");
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exit(1);
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}
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if (*konec == '\n' && *bufer != '\n' && *bufer != ' ') {
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push(&stek, chislo);
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} else if (strcmp(konec, "+\n") == 0) {
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if (isEmpty(&stek)) {
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printf("no input\n");
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exit(1);
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}
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double b = pop(&stek);
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if (isEmpty(&stek)) {
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printf("no input\n");
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exit(1);
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}
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double a = pop(&stek);
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push(&stek, a + b);
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} else if (strcmp(konec, "-\n") == 0) {
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if (isEmpty(&stek)) {
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printf("no input\n");
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exit(1);
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}
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double b = pop(&stek);
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if (isEmpty(&stek)) {
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printf("no input\n");
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exit(1);
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}
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double a = pop(&stek);
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push(&stek, a - b);
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} else if (strcmp(konec, "*\n") == 0) {
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if (isEmpty(&stek)) {
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printf("no input\n");
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exit(1);
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}
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double b = pop(&stek);
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if (isEmpty(&stek)) {
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printf("no input\n");
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exit(1);
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}
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double a = pop(&stek);
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push(&stek, a * b);
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} else if (strcmp(konec, "/\n") == 0) {
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if (isEmpty(&stek)) {
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printf("no input\n");
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exit(1);
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}
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double b = pop(&stek);
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if (isEmpty(&stek)) {
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printf("no input\n");
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exit(1);
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}
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double a = pop(&stek);
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if (b == 0) {
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printf("division by zero\n");
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return 0;
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exit(1);
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}
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push(&stek, a / b);
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} else if (isalpha(konec[-1])) {
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printf("bad input\n");
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exit(1);
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} else {
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printf("bad input\n");
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exit(1);
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}
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for (int i = 0; i < stek.vershina; i++) {
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printf("%.2lf ", stek.chisla[i]);
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}
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printf("\n");
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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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