adding basic program layout

Signed-off-by: surtur <a_mirre@utb.cz>

main.c

@@ -1,7 +1,118 @@
 #include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#include <string.h>
+
+void print_menu(){
+    printf("\n[*] guess a number from 0 to 10\n");
+    printf( "[*] press:\n"
+            "\t1 to play\n"
+            "\t2 to try again\n"
+            "\t...or anything else to exit\n");
+}
+
+int lemmego(){
+    printf("[*] you wished to go, quitting...\n");
+    return EXIT_SUCCESS;
+}
+
+int get_rand(){
+    int ar [10];
+
+    for (int i = 0; i < 10; i++) {
+        int dat_num = 1+ (rand() % 10);
+        ar[i] = dat_num;
+    }
+    int r = ar[rand() % 10];
+    return r;
+}
+
+int get_userguess(){
+    int x = -1;
+    int ok = -1;
+    while( ok != 1){
+        ok = scanf("%d", &x);
+        if(ok == EOF){
+            printf("[*] please, come on...\n");
+        }
+        if(ok == 0){
+            while (fgetc(stdin) != '\n'){
+            }
+            printf("[*] give me a correct value\n");
+            printf("[*] stop gibbering around\n");
+        }
+    }
+
+    return x;
+}
+
+int compare_guess_with_reality(int userguess, int reality){
+    printf("[*] guess was: %d\n", userguess);
+    printf("[*] reality is: %d\n", reality);
+
+    if (userguess == reality) return 0;
+    else return 1;
+}
+
+void guess(){
+    srand(time(0));
+    int userchoice = -1;
+    printf("\nwelcome to the guessing game\n");
+
+    while (userchoice != 3){
+        int userguess = -1;
+        int nurand = -1;
+        int verdict = -1;
+        int ok = -1;
+
+        print_menu();
+
+        while(ok != 1){
+            printf("[*] you: ");
+            ok = scanf("%d", &userchoice);
+            if(ok == EOF){
+                printf("[*] please, come on...\n");
+            }
+            if(ok == 0){
+                while (fgetc(stdin) != '\n'){
+                }
+//                printf("[*] give me a correct value next time (an integer)\n");
+                lemmego();
+                return;
+            }
+        }
+
+        switch( userchoice ) {
+            case 1:
+                nurand = get_rand();
+                printf( "[?] what is your guess then? pick a number from 0 to 10\n" );
+                printf("\tmy guess: ");
+
+                userguess = get_userguess();
+                verdict = compare_guess_with_reality(userguess, nurand);
+
+                if (verdict == 0){
+                    printf("[*] you won because you've got luck. try me next time!\n");
+                }
+                else {
+                    printf("[*] you lost!\n");
+                }
+                break;
+
+            case 2:
+                printf("[*] guess again\n");
+                userchoice = 1;
+                break;
+
+            default:
+                userchoice = 3;
+                lemmego();
+        }
+    }
+}
 
 int main()
 {
-    printf("Hello World!\n");
+    guess();
     return 0;
 }