20190328

Author: Del-te

多项式输出-简单模拟.cpp

@@ -0,0 +1,101 @@
+// 仔细逻辑的把问题想全面
+#include <iostream>
+using namespace std;
+const int maxn = 105;
+int a[maxn];
+int main()
+{
+    int n;
+    cin >> n;
+    for (int i = 0; i < n + 1; i++)
+    {
+        cin >> a[i];
+    }
+
+    for (int j = n; j > 0; j--)
+    {
+        if (j == n)
+        {
+            if (a[n - j] == 0)
+            {
+                continue;
+            }
+            if (a[n - j] == 1)
+            {
+                cout << "x^" << j;
+            }
+            else if (a[n - j] == -1)
+            {
+                cout << "-"
+                     << "x^" << j;
+            }
+            else
+                cout << a[n - j] << "x^" << j;
+        }
+        else if (j == 1)
+        {
+            if (a[n - j] == 1)
+            {
+                cout << "+" << "x";
+            }
+            else if (a[n - j] == -1)
+            {
+                cout << "-"  << "x";
+            }
+
+            else if (a[n - j] == 0)
+            {
+                continue;
+            }
+
+            else if (a[n - j] > 0)
+            {
+                cout << "+" << a[n - j] << "x";
+            }
+            else
+            {
+                cout << a[n - j] << "x";
+            }
+        }
+
+        else if (a[n - j] == 1)
+        {
+            cout << "+"
+                 << "x^" << j;
+        }
+        else if (a[n - j] == -1)
+        {
+            cout << "-"
+                 << "x^" << j;
+        }
+
+        else if (a[n - j] == 0)
+        {
+            continue;
+        }
+
+        else if (a[n - j] > 0)
+        {
+            cout << "+" << a[n - j] << "x^" << j;
+        }
+        else
+        {
+            cout << a[n - j] << "x^" << j;
+        }
+    }
+    // 最后常数项所有情况也要考虑好
+    if (a[n] != 0)
+    {
+
+        if (a[n] > 0)
+        {
+            cout << "+" << a[n];
+        }
+        else
+        {
+            cout << a[n];
+        }
+    }
+    system("pause");
+    return 0;
+}