Negative days completion.

programs/lst35/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "演習課題 1 List 3-5",
+  "description": "非ヌル判定プログラム",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/lst35.png"
+  },
+  "note": ""
+}

programs/lst35/main.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Input integer: ");
+    scanf("%d", &n);
+
+    if (n)
+        puts("The integer is not null(zero).");
+    else
+        puts("The integer is null(zero).");
+
+    return 0;
+}