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t4.c

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+#include <stdio.h>
+int num[4], Class[4];
+float Maths[4], Physics[4], English[4], sum[4];
+void Swap(int k);
+void insert_array();
+int main()
+{
+    insert_array();
+}
+void insert_array()
+{
+    for (int i = 0; i < 3; i++)
+    {
+        scanf("%d%d%f%f%f\n", &num[i], &Class[i], &Maths[i], &Physics[i], &English[i]);
+        sum[i] = Maths[i] + Physics[i] + English[i];
+    }
+    scanf("%d%d%f%f%f", &num[3], &Class[3], &Maths[3], &Physics[3], &English[3]);
+    for (int i = 0; i < 3; i++)
+    {
+        if (num[i] == num[3])
+        {
+            printf("The student's info has already existed!\n");
+            return;
+        }
+    }
+    int inserted_num = num[3];
+    sum[3] = Maths[3] + Physics[3] + English[3];
+    for (int i = 0; i < 4; i++)
+    {
+        for (int j = 3; j > i; j--)
+        {
+            if (Class[j] < Class[j - 1])
+            {
+                Swap(j);
+            }
+            else if (Class[j] == Class[j - 1])
+            {
+                if (sum[j] > sum[j - 1])
+                {
+                    Swap(j);
+                }
+            }
+        }
+    }
+    for (int i = 0; i < 4; i++)
+    {
+        if (num[i] == inserted_num)
+        {
+            printf("%d %d %.1f %.1f %.1f", num[i], Class[i], Maths[i], Physics[i], English[i]);
+            printf(" inserted\n");
+        }
+        else
+        {
+            printf("%d %d %.1f %.1f %.1f\n", num[i], Class[i], Maths[i], Physics[i], English[i]);
+        }
+    }
+}
+void Swap(int k)
+{
+    int num0 = num[k], Class0 = Class[k];
+    float Maths0 = Maths[k], Physics0 = Physics[k], English0 = English[k], sum0 = sum[k];
+    num[k] = num[k - 1];
+    Class[k] = Class[k - 1];
+    Maths[k] = Maths[k - 1];
+    Physics[k] = Physics[k - 1];
+    English[k] = English[k - 1];
+    sum[k] = sum[k - 1];
+    num[k - 1] = num0;
+    Class[k - 1] = Class0;
+    Maths[k - 1] = Maths0;
+    Physics[k - 1] = Physics0;
+    English[k - 1] = English0;
+    sum[k - 1] = sum0;
+}