draft

programs/p41/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "課題1",
+  "description": "教科書の演習4ー1の解答",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p41.png"
+  },
+  "note": ""
+}

programs/p41/main.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+    int retry = 1;
+
+    do {
+        printf("Input integer: ");
+        scanf("%d", &n);
+
+        if (n > 0) {
+	        printf("%d is positive.\n", n);
+        } else if (n < 0) {
+            printf("%d is negative.\n", n);
+        } else {
+            printf("It is zero.\n");
+        }
+
+        printf("Retry? [1/0]: ");
+        scanf("%d", &retry);
+    } while (retry == 1);
+
+    return 0;
+}

programs/p42/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "課題2",
+  "description": "教科書の演習4ー2の解答",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p42.png"
+  },
+  "note": ""
+}

programs/p42/main.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main(void) {
+    int a, b, i, ans;
+
+    printf("Input upper limit: ");
+    (void)scanf("%d", &a);
+    printf("Input lower limit: ");
+    (void)scanf("%d", &b);
+
+    i = b;
+    ans = 0;
+
+    do {
+        ans += i++;
+    } while (i <= a);
+
+    printf("Sum of all integer between %d and %d is %d.\n", b, a, ans);
+
+    return 0;
+}

programs/p43/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "課題3",
+  "description": "教科書の演習4ー3の解答",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p43.png"
+  },
+  "note": ""
+}

programs/p43/main.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Input positive integer: ");
+    scanf("%d", &n);
+
+    while (n >= 0) {
+        printf("%d ", n);
+        n--;
+
+        if (n < 0) {
+            printf("\n");
+        }
+    }
+
+    return 0;
+}

programs/p44/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "課題4",
+  "description": "教科書の演習4ー4の解答",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p44.png"
+  },
+  "note": ""
+}

programs/p44/main.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Input positive integer: ");
+    scanf("%d", &n);
+
+    while (n > 0) {
+        printf("%d ", n--);
+
+        if (n == 0) {
+            printf("\n");
+        }
+    }
+
+    return 0;
+}