Negative days completion.

programs/lst34/info.json

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+{
+  "language": "C",
+  "name": "演習課題 1 List 3-4",
+  "description": "偶数奇数判定プログラム",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/lst34.png"
+  },
+  "note": ""
+}

programs/lst34/main.c

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+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Input integer: ");
+    scanf("%d", &n);
+
+    if (n % 2)
+        puts("The integer is odd.");
+    else
+        puts("The integer is even.");
+    
+    return 0;
+}