90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define STACK_SIZE 10
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#define BUFFER_SIZE 100
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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 init_stack(struct stack* s) {
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s->size = 0;
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}
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int push_stack(struct stack* s, float znac) {
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if (s->size >= STACK_SIZE) {
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printf("full stack\n");
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return 0;
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}
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s->values[s->size++] = znac;
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return 1;
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}
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int pop_stack(struct stack* s, float* out) {
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if (s->size < 1) {
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printf("not enough operands\n");
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return 0;
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}
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*out = s->values[--s->size]; //зменшуємо розмір стеку
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return 1;
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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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}
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printf("\n");
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}
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int main() {
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struct stack mystack;
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char buffer[BUFFER_SIZE];
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char operator;
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float new, a, b, result;
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init_stack(&mystack); //обнуляємо стек
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float chyslo;
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char symbol;
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init_stack(&mystack); //обнуляємо стек
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while (fgets(buffer, BUFFER_SIZE, stdin)) {
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buffer[strcspn(buffer, "\n")] = '\0';
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if (strlen(buffer) == 0) {
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printf("no input\n");
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return 1;
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}
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if (sscanf(buffer, " %f %c", &chyslo, &symbol) == 1) { //спроба прочитати число але без символів
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new = chyslo;
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if (!push_stack(&mystack, new)) return 0;
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print_stack(&mystack);
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} else if (sscanf(buffer, " %c %c", &operator, &symbol) == 1 && strchr("+-*/", operator)) {
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if (!pop_stack(&mystack, &b) || !pop_stack(&mystack, &a)) return 0;
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switch (operator) {
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case '+': result=a+b; break;
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case '-': result=a-b; break;
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case '*': result=a*b; break;
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case '/':
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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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result = a/b;
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break;
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}
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if (!push_stack(&mystack, result)) {
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return 1;
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}
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print_stack(&mystack);
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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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}
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printf("no input\n");
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return 0;
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} |