J.Pabrieža noted: dual only on 2

README.md

@@ -22,6 +22,18 @@ https://www.gnu.org/software/gettext/manual/gettext.html#Plural-forms
 * 2 - other plural. Ex. 25 lapā
 * 3 - plural for 11-19, 10, 20, 100... Ex. 12 lapu
 
+## Build and run
+
+Code should be compilled:
+```
+$ gcc -o plural plural.c
+```
+
+Then it can be run to see testing results.
+```
+$ ./plural
+```
+
 ## Result
 
 See result.txt

plural.c

@@ -13,7 +13,7 @@
 
 #include <stdio.h>
 
-main() {
+int main() {
     int i;
     int n;
     int plural;
@@ -21,25 +21,32 @@ main() {
     printf("This is test of plural forms for Samogitian languages\n");
     printf("Written by Arns Udovič in 2021 <a@arns.lt>\n\n");
     printf("0 - singular or ending in 1 with exception for 11. Ex., 1 laps\n");
-    printf("1 - dual or ending in 2 with exception for 12. Ex. 2 lapo\n");
+    printf("1 - dual. Ex. 2 lapo\n");
     printf("2 - other plural. Ex. 25 lapā\n");
     printf("3 - plural for 11-19, 10, 20, 100... Ex. 12 lapu\n\n");
 
     int data[] = {0, 1, 2, 3, 10, 11, 15, 20, 21, 22, 25, 100, 101, 102, 115, 200, 1000, 100000};
-    int result[] = {3, 0, 1, 2, 3, 3, 3, 3, 0, 1, 2, 3, 0, 1, 3, 3, 3, 3};
+    int result[] = {3, 0, 1, 2, 3, 3, 3, 3, 0, 2, 2, 3, 0, 2, 3, 3, 3, 3};
 
     for (i = 0; i < sizeof(data)/sizeof(int); ++i) {
         n = data[i];
 
         plural=(n % 10 == 1 && n % 100 != 11) ? 0
-            : ((n % 10 == 2 && n % 100 != 12) ? 1
-            : ((n % 10 >= 3 && n % 10 <= 9 && (n % 100 < 11 || n % 100 > 19)) ? 2
+            : ((n == 2) ? 1
+            : ((n != 2 && n % 10 >= 2 && n % 10 <= 9 && (n % 100 < 11 || n % 100 > 19)) ? 2
             : 3));
 
 
         printf("Testing %i, should be: %i, got %i\n", n, result[i], plural);
 
+        if (result[i] != plural) {
+            printf("ERR!\n");
+
+            return 1;
+        }
     }
 
+    printf("\nPASS\n");
+
     return 0;
 }

result.txt

@@ -2,7 +2,7 @@ This is test of plural forms for Samogitian languages
 Written by Arns Udovič in 2021 <a@arns.lt>
 
 0 - singular or ending in 1 with exception for 11. Ex., 1 laps
-1 - dual or ending in 2 with exception for 12. Ex. 2 lapo
+1 - dual. Ex. 2 lapo
 2 - other plural. Ex. 25 lapā
 3 - plural for 11-19, 10, 20, 100... Ex. 12 lapu
 
@@ -15,12 +15,14 @@ Testing 11, should be: 3, got 3
 Testing 15, should be: 3, got 3
 Testing 20, should be: 3, got 3
 Testing 21, should be: 0, got 0
-Testing 22, should be: 1, got 1
+Testing 22, should be: 2, got 2
 Testing 25, should be: 2, got 2
 Testing 100, should be: 3, got 3
 Testing 101, should be: 0, got 0
-Testing 102, should be: 1, got 1
+Testing 102, should be: 2, got 2
 Testing 115, should be: 3, got 3
 Testing 200, should be: 3, got 3
 Testing 1000, should be: 3, got 3
 Testing 100000, should be: 3, got 3
+
+PASS