79 lines
1.6 KiB
C
79 lines
1.6 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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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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}
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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("full stack\n");
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exit(0);
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}
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s->values[s->size] = value;
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s->size++;
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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("not enough operands\n");
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exit(0);
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}
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s->size--;
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return s->values[s->size];
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}
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int main() {
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struct stack s;
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s.size = 0;
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char input[100];
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while (scanf("%s", input) == 1) {
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if (strcmp(input, "+") == 0 || strcmp(input, "-") == 0 ||
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strcmp(input, "*") == 0 || strcmp(input, "/") == 0) {
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if (s.size < 2) {
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printf("not anough operands\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(input, "+") == 0) result = a + b;
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else if (strcmp(input, "-") == 0) result = a - b;
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else if (strcmp(input, "*") == 0) result = a * b;
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else result = a / b;
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push_stack(&s, result);
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print_stack(&s);
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}
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else {
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char *endptr;
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float val = strtof(input, &endptr);
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if (*endptr != '\0') {
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printf("division by zero\n");
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exit(0);
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}
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push_stack(&s, val);
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print_stack(&s);
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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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}
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