Finished first group of assignments

programs/lst22/info.json

@@ -0,0 +1,8 @@
+{
+    "name": "List 2ー2 +$\\\\alpha$",
+    "description": "2桁以上の正の整数の十の位の数字を表示するプログラム。",
+    "output": {
+        "type": "screenshot",
+        "content": "./assets/lst22.png"
+    }
+}

programs/lst22/main.c

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+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Integer n: ");
+    scanf("%d", &n);
+
+    // Don't trust user input
+    if (n < 10) {
+        printf("Integer n must be more than 2 digits.");
+        return 1;
+    }
+
+    printf("Tens digit of interger n is %d.", n / 10 % 10);
+
+    return 0;
+}

programs/prog1/info.json

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+{
+    "name": "演習 2ー1",
+    "description": "2つの整数値を読み込み、前者の値が後者の何\\%であるかを表示するプログラム。",
+    "output": {
+        "type": "screenshot",
+        "content": "./assets/prog1.png"
+    }
+}

programs/prog1/main.c

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+#include <stdio.h>
+
+int main(void) {
+    int x;
+    int y;
+
+    printf("Integer x: ");
+    scanf("%d", &x);
+    printf("Integer y: ");
+    scanf("%d", &y);
+
+    printf("Value of x is %d%% of y.", x * 100 / y);
+
+    return 0;
+}

programs/prog2/info.json

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+{
+    "name": "演習 2ー2",
+    "description": "2つの整数値を読み込み、それらの和と積を表示するプログラム。",
+    "output": {
+        "type": "screenshot",
+	"content": "./assets/prog2.png"
+    }
+}

programs/prog2/main.c

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+#include <stdio.h>
+
+int main(void) {
+    int a;
+    int b;
+
+    printf("Integer a: ");
+    scanf("%d", &a);
+    printf("Integer b: ");
+    scanf("%d", &b);
+
+    printf("Sum of two integers is %d, and product is %d.", a+b, a*b);
+
+    return 0;
+}

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;
+}