From 0d8d38c2c44ce49aa93acb1cc0e9cdd4e6e67477 Mon Sep 17 00:00:00 2001
From: nk365yf <nataliia.kobryn@student.tuke.sk>
Date: Thu, 16 Oct 2025 21:09:49 +0200
Subject: [PATCH] calc

---
 du3/program.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 du3/program.c

diff --git a/du3/program.c b/du3/program.c
new file mode 100644
index 0000000..7f39703
--- /dev/null
+++ b/du3/program.c
@@ -0,0 +1,90 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#define STACK_SIZE 10
+
+
+struct stack {
+   float values[STACK_SIZE];
+   int size;
+};
+
+
+void init(struct stack *s){
+    s->size=0;
+}
+
+int is_empty(struct stack *s){return s->size==0;}
+int is_full(struct stack *s){return s->size==STACK_SIZE-1;}
+
+
+void push(struct stack *s, float value){
+    if (is_full(s)){
+        printf("Chyba");
+        exit(1);
+    }
+    s->values[s->size++]=value;
+}
+
+float pop (struct stack *s){
+    if (is_empty(s)){
+        printf("Stack is empty");
+        return 1;
+    }
+    return s->values[--(s->size)];
+}
+
+
+void print_s(struct stack *s){
+    for(int i =0;i<s->size;i++){
+        printf("%.10f ", s->values[i]);
+    }
+    printf("\n");
+}
+
+
+int main(){
+    struct stack mystack;
+    init(&mystack);
+
+    char input[100];
+
+    while(fgets(input, sizeof(input), stdin)){
+        input[strcspn(input,"\n")]='\0';
+
+        char *endpt;
+        float num = strtod(input,&endpt);
+
+        if(endpt!=input&&*endpt=='\0'){
+            push(&mystack,num);
+        }
+        else if (strlen(input)==1&&strchr("+-*/",input[0])){
+            if (mystack.size<2){
+                printf("Nedostatok hodnot");
+                return 1;}
+            float b=pop(&mystack);
+            float a = pop(&mystack);
+            float result = 0;
+
+            if (input[0]=='+') result=a+b;
+            if (input[0]=='-') result=a-b;
+            if (input[0]=='*') result=a*b;
+            if (input[0]=='/'){
+                if (b==0) {printf("delenie nulou, chyba");return 1;}
+                result=a/b;
+            }
+            push(&mystack, result);
+        }
+        else{
+            printf("Chyba");
+            return 1;
+        }
+        print_s(&mystack);
+    }
+    
+    
+    return 0;
+}
+