From 9786b86b3fc2994410d5b2fbb892c3d76729c517 Mon Sep 17 00:00:00 2001
From: vj586da <valer.jakubco@student.tuke.sk>
Date: Thu, 21 Oct 2021 22:16:34 +0200
Subject: [PATCH] first commit

---
 cv3/program.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 cv3/program.c

diff --git a/cv3/program.c b/cv3/program.c
new file mode 100644
index 0000000..c6294d5
--- /dev/null
+++ b/cv3/program.c
@@ -0,0 +1,99 @@
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <stdlib.h>
+
+#define STACK_SIZE 20
+
+struct stack{
+    float values[STACK_SIZE];
+    int size;
+};
+
+void print_stack(struct stack* stack);
+void push_stack(struct stack* stack, float value);
+float pop_stack(struct stack* stack);
+int count_stack(struct stack* stack);
+
+
+
+int main(){
+    
+
+    char char_value[STACK_SIZE];
+    memset(&char_value,0,STACK_SIZE);
+    float float_value;
+    char* ptr;
+    struct stack myStack;
+    memset(&myStack,0,sizeof(struct stack));
+    while(1){
+        ptr = fgets(char_value, STACK_SIZE-1, stdin);
+        if(ptr != NULL ){
+            float_value = strtof(char_value, NULL);
+            if(float_value == 0){
+                if(char_value[0] == '+'){
+                    float a = pop_stack(&myStack);
+                    float b = pop_stack(&myStack);                    
+                    float c = a+b;
+                    push_stack(&myStack, c);
+                    print_stack(&myStack);
+                    printf("\n");
+                }
+                if(char_value[0] == '-'){
+                    float a = pop_stack(&myStack);
+                    float b = pop_stack(&myStack);                    
+                    float c = a-b;
+                    push_stack(&myStack, c);
+                    print_stack(&myStack);
+                    printf("\n");
+                }
+                if(char_value[0] == '*'){
+                    float a = pop_stack(&myStack);
+                    float b = pop_stack(&myStack);                    
+                    float c = a*b;
+                    push_stack(&myStack, c);
+                    print_stack(&myStack);
+                    printf("\n");
+                } 
+                if(char_value[0] == '/'){
+                    float a = pop_stack(&myStack);
+                    float b = pop_stack(&myStack);                    
+                    float c = a/b;
+                    push_stack(&myStack, c);
+                    print_stack(&myStack);
+                    printf("\n");
+                }
+ 
+            }else { 
+                push_stack(&myStack, float_value);
+                print_stack(&myStack);
+                printf("\n");
+            }
+        }else{
+            break;
+        }
+    } 
+
+
+    return 0;
+}
+
+void print_stack(struct stack* stack){
+    printf(">");
+    for(int i = 0; i < stack->size; i++){
+        printf(" %f ",stack->values[i]);
+    }
+}
+
+void push_stack(struct stack* stack, float value){
+    assert(stack->size < STACK_SIZE);
+    stack->values[stack->size] = value;
+    stack->size += 1;
+}
+
+float pop_stack(struct stack* stack){
+    assert(stack->size > 0);
+    float value = stack->values[stack->size-1];
+    stack->size -= 1;
+    return value;
+}