Finished first group of assignments

programs/rev3dig/info.json

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+{
+    "name": "課題4",
+    "description": "入力した三桁の正の整数の数字の並びを逆順させた数字を表示するプログラム。",
+    "output": {
+        "type": "screenshot",
+        "content": "./assets/rev3dig.png"
+    }
+}

programs/rev3dig/main.c

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+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Integer n: ");
+    scanf("%d", &n);
+
+    // Throw error when n is not in range of 100 <= n <= 999
+    if (n < 100 || n > 999) {
+        printf("Integer n must be 3 digit number");
+        return 1;
+    }
+
+    int a, b, c, m; // a * 10^2 + b * 10^1 + c * 10^0 = n
+
+    a = n / 100;
+    b = n / 10 % 10;
+    c = n % 10;
+
+    m = c * 100 + b * 10 + a; // m is reversed n
+
+    printf("Reversed integer is %d.", m);
+
+    return 0;
+}