pattern

patterns/.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+    "files.associations": {
+        "iostream": "cpp",
+        "ostream": "cpp"
+    }
+}

patterns/1.cpp

@@ -0,0 +1,30 @@
+/*
+* * * *
+* * * *
+* * * *
+* * * *
+* * * *
+
+Rows 5
+Cols 4
+
+*/
+
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int rows = 5, cols = 4;
+    int i, j;
+    for (i = 0; i < rows; ++i)
+    {
+        for (j = 0; j < cols; ++j)
+        {
+            cout << "* ";
+        }
+        cout << endl;
+    }
+
+    return 0;
+}

patterns/10.cpp

@@ -0,0 +1,37 @@
+/*
+          * * * *
+        * * * *
+      * * * *
+    * * * *
+  * * * *
+
+n 5
+rows 1 to n
+cols 
+n-i = spaces at first {space print from 1 to n-i}
+then print starts 1 to n
+
+*/
+
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int n = 5;
+    int i, j;
+    for (i = 0; i < n; ++i)
+    {
+        for (j = 0; j < n - i; ++j)
+        {
+            cout << "  ";
+        }
+        for (j = 0; j < n; ++j)
+        {
+            cout << "* ";
+        }
+        cout << endl;
+    }
+
+    return 0;
+}

patterns/11.cpp

@@ -0,0 +1,43 @@
+/*
+         1    
+       1  2      
+     1  2  3        
+   1  2  3  4          
+ 1  2  3  4  5    
+
+n=5
+Rows  i to n (i ptr)
+space will be n-i
+cols 1 to i numbers
+
+*/
+
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int n = 5;
+    int i, j;
+    int cnt = 0;
+    for (i = 1; i <= n; ++i) //for rows
+    {
+        for (j = 1; j <= n; ++j) //for cols
+
+        {
+
+            if (j <= n - i)
+            {
+                cout << " ";
+            }
+            else
+            {
+                cout << ++cnt << " ";
+            }
+        }
+        cnt = 0;
+        cout << endl;
+    }
+
+    return 0;
+}

patterns/12.cpp

@@ -0,0 +1,46 @@
+/*
+         1    
+       2 1 2      
+     3 2 1 2 3        
+   4 3 2 1 2 3 4         
+ 5 4 3 2 1 2 3 4 5 
+
+n=5
+Rows  1 to n (i ptr)
+cols has 3 parts
+space   -> 1 to n-i, when n =5 and row npo is 1 we have 4 spaces
+nos in decreasing order n-i to 1 -> k= row number (i), print k-- till 1
+nos in incre order -> let k = 2 , k++ till n
+
+
+*/
+
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int n = 5;
+    int i, j;
+    for (i = 1; i <= n; i++) //for rows
+    {
+        for (j = 1; j <= n - i; j++) //space   -> 1 to n-i, when n =5 and row npo is 1 we have 4 spaces
+
+        {
+            cout << "  ";
+        }
+        int k = i;          //nos in decreasing order n-i to n -> k= row number (i), print k-- till 1
+        for (; j <= n; j++) // j=n-i that is 4 to 5(n) (k is 1)
+        {
+            cout << k-- << " ";
+        }
+        k = 2;                      //nos in incre order -> let k = 2 , k++ till
+        for (; j <= n + i - 1; j++) //writing in terms of rows
+        {
+            cout << k++ << " ";
+        }
+        cout << endl;
+    }
+
+    return 0;
+}

patterns/13.cpp

@@ -0,0 +1,68 @@
+/*
+         *    
+      *  *  *      
+   *  *  *  *  *        
+*  *  *  *  *  *  *  
+*  *  *  *  *  *  *      
+   *  *  *  *  * 
+      *  *  *    
+         *
+         
+         *    
+      *  *  *      
+   *  *  *  *  *        
+*  *  *  *  *  *  *  
+
+rows 1 to n
+cols 
+spaces n-i
+stars 2*i - 1 will give stars will give me odd nos
+        
+
+n=4
+*/
+
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int n = 4;
+    int i, j;
+    int cnt = 0;
+    //for first half
+    for (i = 1; i <= n; ++i) //for rows
+    {
+
+        for (j = 1; j <= n - i; ++j) //for spaces
+
+        {
+            cout << "  ";
+        }
+        for (j = 1; j <= (2 * i) - 1; ++j) //for stars  (2*i - 1 will give stars will give me odd nos)
+
+        {
+
+            cout << "* ";
+        }
+        cout << endl;
+    }
+    //for 2nd half
+    for (i = n; i >= 1; --i) //for rows
+    {
+
+        for (j = 1; j <= n - i; ++j) //for spaces
+
+        {
+            cout << "  ";
+        }
+        for (j = 1; j <= (2 * i) - 1; ++j) //for stars  (2*i - 1 will give stars will give me odd nos)
+
+        {
+
+            cout << "* ";
+        }
+        cout << endl;
+    }
+    return 0;
+}

patterns/14.cpp

@@ -0,0 +1,42 @@
+/*
+   
+    *        *
+  *   *    *   *    
+*       *        *    
+
+n=9
+rows = 3 
+cols
+chech col and row no of stars
+when we add i+j we get 4,6,8,10,12
+so i+j%4==0 will be acceptable for 4 and 8 and 12
+but for 6 and 10
+when i = 2 and j%4==0
+*/
+
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int n = 9;
+    int i, j;
+    for (i = 1; i <= 3; ++i) //for rows
+    {
+        for (j = 1; j <= n; ++j) //for cols
+
+        {
+            if ((j + i) % 4 == 0 or (i == 2 and j % 4 == 0))
+            {
+                cout << "* ";
+            }
+            else
+            {
+                cout << "  ";
+            }
+        }
+        cout << endl;
+    }
+
+    return 0;
+}

patterns/2.cpp

@@ -0,0 +1,41 @@
+/*
+* * * *
+*     *
+*     *
+*     *
+* * * *
+
+Rows 5
+Cols 4
+
+*/
+
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int rows = 5, cols = 4;
+    int i, j;
+    for (i = 0; i < rows; ++i)
+    {
+        for (j = 0; j < cols; ++j)
+        {
+            if (i == 0 or i == rows - 1) //when 1st row or last row
+            {
+                cout << "* ";
+            }
+            else if (j == 0 or j == cols - 1) //when 1st column or last column
+            {
+                cout << "* ";
+            }
+            else
+            {
+                cout << "  ";
+            }
+        }
+        cout << endl;
+    }
+
+    return 0;
+}

patterns/3.cpp

@@ -0,0 +1,30 @@
+/*
+* * * * *  n=5
+* * * *      4
+* * *        .
+* *          .
+*            1
+
+Rows 5
+
+
+*/
+
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int n = 5;
+    int i, j;
+    for (i = n; i > 0; --i) //for rows
+    {
+        for (j = 0; j < i; ++j) //for cols
+        {
+            cout << "* ";
+        }
+        cout << endl;
+    }
+
+    return 0;
+}