102 lines
2.4 KiB
C
102 lines
2.4 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("not enough operands\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("not enough operands\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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if (bufer[0] == '\n') {
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if (isEmpty(&stek)) {
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printf("no input\n");
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} else {
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double result = pop(&stek);
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printf("%.2lf\n", result);
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}
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return 0;
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}
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char* konec;
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double chislo = strtod(bufer, &konec);
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char c = konec[0];
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if (c == '\n' && *bufer != '\n' && *bufer != ' ') {
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push(&stek, chislo);
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} else if (c == '+' || c == '-' || c == '*' || c == '/') {
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if (isEmpty(&stek)) {
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printf("not enough operands\n");
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return 0;
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}
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double b = pop(&stek);
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if (isEmpty(&stek)) {
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printf("not enough operands\n");
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return 0;
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}
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double a = pop(&stek);
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if (c == '+') {
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push(&stek, a + b);
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} else if (c == '-') {
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push(&stek, a - b);
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} else if (c == '*') {
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push(&stek, a * b);
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} else if (c == '/') {
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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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}
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push(&stek, a / b);
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}
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} else if (!isdigit(c) || !isalpha(c)) {
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printf("bad input\n");
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return 0;
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} else {
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printf("no input\n");
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return 0;
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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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} |