Matrix

circular matrix.cpp

@@ -0,0 +1,46 @@
+#include <bits/stdc++.h>
+#define ll long long
+using namespace std;
+int main() 
+{
+        int n,r1,r2,c1,c2,k=1,i,j;
+        cout<<"Enter matrix size:"<<endl;
+        cin>>n;
+        int a[n][n];
+        c1=0;c2=n-1;r1=0;r2=n-1;
+        do
+        {
+            //arranging the matrix
+            for(i=c1;i<=c2;i++)
+            {
+                a[r1][i]=k;
+                k++;
+            }
+            for(j=r1+1;j<=r2;j++)
+            {
+                a[j][c2]=k;
+                k++;
+            }
+            for(i=c2-1;i>=c1;i--)
+            {
+                a[r2][i]=k;
+                k++;
+            }
+            for(j=r2-1;j>=r1+1;j--)
+            {
+                a[j][c1]=k;
+                k++;
+            }
+            c1++;c2--;r1++;r2--;
+        }
+        while(k<=n*n);
+        //printing the new matrix
+        cout<<"Circular matrix is listed below:"<<endl;
+        for(i=0;i<n;i++)
+        {
+            for(j=0;j<n;j++)
+            cout<<a[i][j]<<"\t";
+            cout<<endl;
+        }
+}
+

diamond_pattern.cpp

@@ -0,0 +1,34 @@
+#include<bits/stdc++.h>
+#include<math.h>
+using namespace std;
+int main()
+{
+        int i,j,k,m=5;
+        //message to be displayed on screen
+        cout<<"Enter a character"<<endl;
+        char ch;
+        cin>>ch;
+        cout<<"The required pattern:"<<endl;
+        //printing the pattern
+        for(i=1;i<=5;i++)
+        {
+               for(j=1;j<=m;j++)
+               cout<<" ";
+               for(k=1;k<=i;k++)
+               cout<<ch<<" ";
+               cout<<endl;
+               m=m-1;
+        }
+        m=2;
+        for(i=4;i>=1;i--)
+        {
+            for(j=1;j<=m;j++)
+            cout<<" ";
+            for(k=1;k<=i;k++)
+            cout<<ch<<" ";
+            cout<<endl;
+            m=m+1;
+        }
+ }
+
+

julian_date.cpp

@@ -0,0 +1,48 @@
+#include<bits/stdc++.h>
+#include<math.h>
+using namespace std;   
+	int dd=0,mm=0,yy=0;
+    int jd=0;
+
+    int fnleap()
+    {
+        cout<<"Enter day:"<<endl;
+        cin>>dd;
+        cout<<"Enter month:"<<endl;
+        cin>>mm;
+        cout<<"Enter year:"<<endl;
+        cin>>yy;
+        if(yy%4==0)
+        return(1);
+        else 
+        return(0);
+    }
+    int fnisvalid()
+    {
+        if(dd<1||dd>31)
+        return(0);
+        if(mm<1||mm>12)
+        return(0);
+        if(yy<1)
+        return(0);
+        else
+        return(1);
+    }
+    int main()
+    {
+        int endm[]={31,29,31,30,31,30,31,31,30,31,30,31};
+        if(fnleap()==0)
+        endm[1]=28;
+        int r=0;
+        int p=fnisvalid();
+        if(p==0)
+        {
+            cout<<"INVALID INPUT !!!!"<<endl;
+            exit(0);
+        }
+        for(int i=0;i<mm-1;i++)
+        r=endm[i]+r;
+        jd=dd+r;
+        cout<<"JULIAN DATE :"<<jd;
+    }
+

kaprekar_number.cpp

@@ -0,0 +1,37 @@
+#include<bits/stdc++.h>
+#include<math.h>
+using namespace std;
+int sum(int n)
+  {
+        int m=n,d=0;
+        int s=m*m;
+        //while loop begins to count the number of digits
+        while(n!=0)
+        {
+         d++;
+         n=n/10;
+        }
+        int a=s%(int)pow(10,d);
+        int b=s/(int)pow(10,d);
+        int su=a+b;
+        return(su);
+  }
+  int main()
+  {
+  	int k=0,num,m;
+    cout<<"Enter the upper and lower limits :"<<endl;
+    cin>>num>>m;
+    //displaying the reasult
+    cout<<"The kaprekar numbers within "<<m<<" and "<<num<<" : "<<endl;
+    for(int i=m;i<=num;i++)
+    {
+      if(sum(i)==i)
+      {
+        cout<<i<<"\t";
+        k++;
+      }
+    }
+    cout<<endl;
+  }
+
+