draft

programs/p410/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "演習 4-10",
+  "description": "入力した整数値の個数分縦にアスタリスクを表示するプログラム。",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p410.png"
+  },
+  "note": ""
+}

programs/p410/main.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Input positive integer: ");
+    scanf("%d", &n);
+
+    if (n < 1) {
+        return 1;
+    }
+
+    while (n-- > 0) {
+        putchar('*');
+        if (n != 0) {
+            putchar('\n');
+        }
+    }
+
+    return 0;
+}

programs/p411/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "演習 4-11",
+  "description": "教科書のList 4-10の出力に入力値も表示するように変更したプログラム。",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p411.png"
+  },
+  "note": ""
+}

programs/p411/main.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    do {
+        printf("Input positive integer: ");
+        scanf("%d", &n);
+        if (n <= 0) {
+            puts("\aPlease input non-negative, non-zero integer.");
+        }
+    } while (n <= 0);
+
+    printf("Reverse of %d is ", n);
+    while (n > 0) {
+        printf("%d", n % 10);
+        n /= 10;
+    }
+
+    puts(".");
+
+    return 0;
+}

programs/p412/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "演習 4-12",
+  "description": "入力した正の整数値の桁数を表示するプログラム。",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p412.png"
+  },
+  "note": ""
+}

programs/p412/main.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    do {
+        printf("Input positive integer: ");
+        scanf("%d", &n);
+        if (n <= 0) {
+            puts("\aPlease input non-negative, non-zero integer.");
+        }
+    } while (n <= 0);
+
+    int d = 0;
+    int x = n;
+    while (x > 0) {
+        x /= 10;
+        d++;
+    }
+
+    printf("%d is %d digit number.\n", n, d);
+
+    return 0;
+}

programs/p45/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "演習 4-5",
+  "description": "教科書のList 4-7のスタートを0から1へ書き換えたプログラム。",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p45.png"
+  },
+  "note": ""
+}

programs/p45/main.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Input positive integer: ");
+    scanf("%d", &n);
+
+    if (n <= 0) {
+        return 1;
+    }
+
+    int i = 1;
+
+    while (i <= n) {
+        printf("%d ", i++);
+    }
+    printf("\n");
+
+    return 0;
+}

programs/p46/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "演習 4-6",
+  "description": "入力した整数値以下の偶数を出力するプログラム。",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p46.png"
+  },
+  "note": ""
+}

programs/p46/main.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Input positive integer: ");
+    scanf("%d", &n);
+
+    if (n <= 1) {
+        return 1;
+    }
+
+    int i = 1;
+
+    while (2*i <= n) {
+        printf("%d ", 2*i++);
+    }
+
+    printf("\n");
+
+    return 0;
+}

programs/p47/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "演習 4-7",
+  "description": "入力した整数値以下の2のべき乗を出力するプログラム。",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p47.png"
+  },
+  "note": ""
+}

programs/p47/main.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Input positive integer: ");
+    scanf("%d", &n);
+
+    if (n <= 1) {
+        return 1;
+    }
+
+    int i = 2;
+
+    while (i <= n) {
+        printf("%d ", i);
+        i <<= 1;
+    }
+
+    printf("\n");
+
+    return 0;
+}

programs/p48/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "演習 4-8",
+  "description": "教科書のList 4-8を1未満の時に改行を出力しないよにしたプログラム。",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p48.png"
+  },
+  "note": ""
+}

programs/p48/main.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Input positive integer: ");
+    scanf("%d", &n);
+
+    if (n < 1) {
+        return 1;
+    }
+
+    while (n-- > 0) {
+        putchar('*');
+    }
+
+    putchar('\n');
+
+    return 0;
+}

programs/p49/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "演習 4-9",
+  "description": "入力した整数値の個数分$+$と$-$を交互に出力するプログラム。",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p49.png"
+  },
+  "note": ""
+}

programs/p49/main.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Input positive integer: ");
+    scanf("%d", &n);
+
+    if (n <= 0) {
+        return 1;
+    }
+
+    int i = 0;
+
+    while (i < n) {
+        if (i % 2) {
+            putchar('-');
+        } else {
+            putchar('+');
+        }
+        i++;
+    }
+
+    putchar('\n');
+
+    return 0;
+}