diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8334bf2..409c998 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,18 @@ project(skola C)
 
 set(CMAKE_C_STANDARD 23)
 
-add_executable(skola main.c)
+add_executable(skola calc.c
+        kruh.c
+        main_rovnice.c
+        newoldmain.c
+        oldmain.c
+        tyzden.c
+        main.c
+        tyzden.h
+        newoldmain.h
+        main_rovnice.h
+        kruh.h
+        calc.h
+        znak.c)
 
 target_link_libraries(skola m)
diff --git a/calc.c b/calc.c
new file mode 100644
index 0000000..92c4a14
--- /dev/null
+++ b/calc.c
@@ -0,0 +1,39 @@
+#include "stdio.h"
+#include "math.h"
+#include "calc.h"
+int calc(){
+    double a = 0;
+    double b = 0;
+    char operacia = 0;
+    double vysledok = 0;
+    printf("Zadaj prvé číslo:\n");
+    scanf("%lf", &a);
+    printf("Zadaj druhé číslo:\n");
+    scanf("%lf", &b);
+    printf("Zadaj operáciu(+ - * /):\n");
+    scanf(" %c", &operacia);
+    vysledok = a;
+    switch (operacia) {
+        case '+':
+            vysledok += b;
+            break;
+
+        case '-':
+            vysledok -= b;
+            break;
+
+        case '*':
+            vysledok *= b;
+            break;
+
+        case '/':
+            vysledok /= b;
+            break;
+
+        default:
+            printf("Nesprávna operácia.\n");
+            return 1;
+    }
+    printf("Vysledok %f %c %f je: %f\nKalkulačka skončila úspešne.\n", a, operacia, b, vysledok);
+    return 0;
+}
\ No newline at end of file
diff --git a/calc.h b/calc.h
new file mode 100644
index 0000000..49769b5
--- /dev/null
+++ b/calc.h
@@ -0,0 +1 @@
+int calc();
diff --git a/kruh.c b/kruh.c
index de6475d..811a387 100644
--- a/kruh.c
+++ b/kruh.c
@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <math.h>
-
-int main(){
+#include "kruh.h"
+int circle(){
     float r = 0;
     float obsah = 0;
     float obvod = 0;
diff --git a/kruh.h b/kruh.h
new file mode 100644
index 0000000..98a26b1
--- /dev/null
+++ b/kruh.h
@@ -0,0 +1 @@
+int circle();
diff --git a/main.c b/main.c
index 26dbafb..5f850c6 100644
--- a/main.c
+++ b/main.c
@@ -1,39 +1,5 @@
-#include "stdio.h"
-#include "math.h"
+#include "znak.h"
 
 int main(){
-    double a = 0;
-    double b = 0;
-    char operacia = 0;
-    double vysledok = 0;
-    printf("Zadaj prvé číslo:\n");
-    scanf("%lf", &a);
-    printf("Zadaj druhé číslo:\n");
-    scanf("%lf", &b);
-    printf("Zadaj operáciu(+ - * /):\n");
-    scanf(" %c", &operacia);
-    vysledok = a;
-    switch (operacia) {
-        case '+':
-            vysledok += b;
-            break;
-
-        case '-':
-            vysledok -= b;
-            break;
-
-        case '*':
-            vysledok *= b;
-            break;
-
-        case '/':
-            vysledok /= b;
-            break;
-
-        default:
-            printf("Nesprávna operácia.\n");
-            return 1;
-    }
-    printf("Vysledok %f %c %f je: %f\nKalkulačka skončila úspešne.\n", a, operacia, b, vysledok);
-    return 0;
+    return znak();
 }
\ No newline at end of file
diff --git a/main_rovnice.c b/main_rovnice.c
index 7636f4e..6eb8d61 100644
--- a/main_rovnice.c
+++ b/main_rovnice.c
@@ -1,7 +1,7 @@
 #include <stdio.h>
 
 #include <math.h>
-
+#include "main_rovnice.h"
 
 int trojuholnikalgo(int a, int b, int c) {
     if (((a + b) > c) && ((a + c) > b) && ((b + c) > a)) {
@@ -76,7 +76,7 @@ void rovnicapriamky() {
     }
 }
 
-int main() {
+int rovnice() {
 
     //trojuholnik();
     rovnicapriamky();
diff --git a/main_rovnice.h b/main_rovnice.h
new file mode 100644
index 0000000..6f1d532
--- /dev/null
+++ b/main_rovnice.h
@@ -0,0 +1,9 @@
+int trojuholnikalgo(int a, int b, int c);
+
+void trojuholniktyp(int a, int b, int c);
+
+void trojuholnik();
+
+void rovnicapriamky();
+
+int rovnice();
diff --git a/newoldmain.c b/newoldmain.c
index 17ddfca..0c024ad 100644
--- a/newoldmain.c
+++ b/newoldmain.c
@@ -1,5 +1,8 @@
 #include <stdio.h>
 #include <math.h>
+#include "stdint.h"
+#include "stdlib.h"
+#include "newoldmain.h"
 
 const float pi = 3.14;
 
@@ -45,7 +48,7 @@ float otrojuholnik(float a, float b, float c){
     return a + b + c;
 }
 
-void trojuholnik(){
+void trojuholnikold(){
     float a = 0;
     float b = 0;
     float c = 0;
@@ -73,13 +76,6 @@ void trojuholnik(){
 
 }
 
-int main(){
-    //valec();
-    trojuholnik();
-
-    return 0;
-}
-
 void parne(){
     int cislo = 0;
     printf("Zadaj cislo:");
@@ -95,7 +91,7 @@ void parne(){
 
 }
 
-int porovnavanie(cislo1, cislo2, cislo3){
+int porovnavanie(int cislo1, int cislo2, int cislo3){
     int min = 0;
 
     if (cislo1 < cislo2){
diff --git a/newoldmain.h b/newoldmain.h
new file mode 100644
index 0000000..bc7b708
--- /dev/null
+++ b/newoldmain.h
@@ -0,0 +1,25 @@
+extern const float pi;
+
+float skruhu(float r);
+
+float okruhu(float r);
+
+float svalec(float r, float h);
+
+float vvalec(float r, float h);
+
+void valec();
+
+float strojuholnik(float a, float va);
+
+float otrojuholnik(float a, float b, float c);
+
+void trojuholnikold();
+
+void parne();
+
+int porovnavanie(int cislo1, int cislo2, int cislo3);
+
+int porovnavanietest(int *cisla, int pocet);
+
+void porovnavaniecelok();
diff --git a/oldmain.c b/oldmain.c
index 09802f7..3e37aae 100644
--- a/oldmain.c
+++ b/oldmain.c
@@ -5,7 +5,7 @@ FILE *fp;
 char c;
 int a;
 
-int main(){
+int oldmain(){
 
     fp = fopen("test.txt", "r");
     while (!feof(fp)){
diff --git a/tyzden.c b/tyzden.c
new file mode 100644
index 0000000..62d5236
--- /dev/null
+++ b/tyzden.c
@@ -0,0 +1,36 @@
+#include "tyzden.h"
+#include "stdio.h"
+#include "stdint.h"
+
+
+int tyzden(){
+    uint8_t den = 0;
+    printf("Zadaj číslo dňa v týždni:");
+    scanf("%hhd", &den);
+    switch (den) {
+        case 1:
+            printf("1. deň v týždni je pondelok\n");
+            break;
+        case 2:
+            printf("2. deň v týždni je utorok\n");
+            break;
+        case 3:
+            printf("3. deň v týždni je streda\n");
+            break;
+        case 4:
+            printf("4. deň v týždni je štvrtok\n");
+            break;
+        case 5:
+            printf("5. deň v týždni je piatok\n");
+            break;
+        case 6:
+            printf("6. deň v týždni je sobota\n");
+            break;
+        case 7:
+            printf("7. deň v týždni je nedeľa\n");
+            break;
+        default:
+            printf("Taký deň v týždni neexistuje.");
+
+    }
+}
\ No newline at end of file
diff --git a/tyzden.h b/tyzden.h
new file mode 100644
index 0000000..1b151ac
--- /dev/null
+++ b/tyzden.h
@@ -0,0 +1 @@
+int tyzden();
\ No newline at end of file
diff --git a/znak.c b/znak.c
new file mode 100644
index 0000000..5115363
--- /dev/null
+++ b/znak.c
@@ -0,0 +1,16 @@
+#include "stdio.h"
+int znak(){
+    char in;
+    printf("Zadaj znak:");
+    scanf("%c", &in);
+    switch (in) {
+        case 'a': printf("Volba a.\n");
+        case 'b': printf("Volba b.\n");
+        case 'c': printf("Volba c.\n");
+            break;
+        default:
+            printf("Nevybral si si a/b/c.\n");
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/znak.h b/znak.h
new file mode 100644
index 0000000..d1ed7ee
--- /dev/null
+++ b/znak.h
@@ -0,0 +1 @@
+int znak();
\ No newline at end of file