62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define SIZE 10
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int main(void) {
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double ulozisko[SIZE];
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int top = 0;
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char vstup[64];
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while (fgets(vstup, sizeof(vstup), stdin)) {
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vstup[strcspn(vstup, "\n")] = 0;
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if (strlen(vstup) == 0) {
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printf("no input\n");
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return 0;
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}
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char *koniec;
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double cislo = strtod(vstup, &koniec);
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if (*koniec == '\0') {
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if (top >= SIZE) {
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printf("full stack\n");
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return 0;
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}
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ulozisko[top++] = cislo;
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}
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else if (strlen(vstup) == 1 && strchr("+-*/", vstup[0])) {
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if (top < 2){
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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 = ulozisko[--top];
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double a = ulozisko[--top];
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double vysledok = 0.0;
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switch (vstup[0]) {
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case '+': vysledok = a + b; break;
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case '-': vysledok = a - b; break;
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case '*': vysledok = a * b; break;
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case '/': vysledok = b == 0 ? (printf("division by zero\n"), exit(0), 0) : a / b; break;
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default: printf("invalid op\n"); return 0;
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}
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ulozisko[top++] = vysledok;
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}
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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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for (int i = 0; i < top; i++)
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printf("%.2f ", ulozisko[i]);
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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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