1 files changed, 42 insertions, 0 deletions
diff --git a/src/odutils/oif.c b/src/odutils/oif.c
new file mode 100644
index 0000000..b5ef22f
--- /dev/null
+++ b/src/odutils/oif.c
@@ -0,0 +1,42 @@
+/**
+ * oif.c - source file for just testing basic optics-related functions.
+ *
+ * Copyright (C) 2025 https://optics-design.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * See the COPYING file for the full license text.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[]) {
+    if (argc != 4){
+        printf("This program calculates relations between object, image and focal length.\nIt requires you to provide two of these and leave the third one as any char in the form of O I F.\nExample: 90 x 50 will output 112.5");
+        return 1;
+    }
+    char *po, *pi, *pf;
+    float o,i,f;
+
+    o =  strtof(argv[1], &po);
+    i =  strtof(argv[2], &pi);
+    f =  strtof(argv[3], &pf);
+    if (*po && !*pi && !*pf) {
+        o = i*f/(i-f); 
+    }
+    else if (!*po && *pi && !*pf) {
+        i = o*f/(o-f); 
+    }
+    else if (!*po && !*pi && *pf) {
+        f = o*i/(o+i); 
+    }
+    else {
+        printf("Wrong usage of the program! Refer to help");
+        return 1;
+    }
+    printf("Object Distance: %.5f\nImage Distance: %.5f\nFocal Length: %.5f\n",o,i,f);
+    return 0;
+}