init commit

3sem/cnts/contest1/02.c

@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+enum
+{
+    NUM_OF_DIGITS = '9' - '0' + 1,
+    NUM_OF_LETTERS = 'z' - 'a' + 1,
+    BIT_MASK_1 = 0b111011,
+    BIT_MASK_2 = 0b001000,
+    MAX_NUM = 64,
+};
+
+int
+main(void)
+{
+    int c;
+
+    while ((c = getchar()) != EOF) {
+        int code = 0;
+
+        if (c <= '9' && c >= '0') {
+            code = c - '0' + 1;
+        } else if (c <= 'z' && c >= 'a') {
+            code = c - 'a' + NUM_OF_DIGITS + 1;
+        } else if (c <= 'Z' && c >= 'A') {
+            code = c - 'A' + NUM_OF_DIGITS + NUM_OF_LETTERS + 1;
+        }
+
+        if (code == 0) {
+            continue;
+        }
+
+        code = code & BIT_MASK_1;
+        code ^= BIT_MASK_2;
+
+        int res = 0;
+        if (code <= NUM_OF_DIGITS && code >= 1) {
+            res = code - 1 + '0';
+        } else if (code <= NUM_OF_DIGITS + NUM_OF_LETTERS && code >= NUM_OF_DIGITS + 1) {
+            res = code + 'a' - NUM_OF_DIGITS - 1;
+        } else if (code <= NUM_OF_DIGITS + NUM_OF_LETTERS * 2 && code >= NUM_OF_DIGITS + NUM_OF_LETTERS + 1) {
+            res = code + 'A' - NUM_OF_DIGITS - NUM_OF_LETTERS - 1;
+        } else if (code == 0) {
+            res = '@';
+        } else if (code == MAX_NUM - 1) {
+            res = '#';
+        }
+
+        putchar(res);
+    }
+
+    return 0;
+}