Merge pull request #2 from varunk122/master

added a new program

Author: SayanBan

pointer based matrix addition.c

@@ -0,0 +1,25 @@
+#include<stdio.h>
+
+int main()
+{
+
+    int m,n;
+    scanf("%d%d",&m,&n);
+    int *ptr1=(int*)malloc((m*n)*sizeof(int));
+    int *ptr2=(int*)malloc((m*n)*sizeof(int));
+    for(int i=0;i<m*n;i++)
+        scanf("%d",(ptr1+i));
+    for(int i=0;i<m*n;i++)
+       scanf("%d",(ptr2+i));
+
+       for(int i=0;i<m*n;i++)
+       {
+           if (!((i%n)==(n-1)))printf("%d ",*(ptr1+i)+*(ptr2+i));
+           if(i%n==(n-1)) printf("%d \n",*(ptr1+i)+*(ptr2+i));
+       }
+
+
+
+
+    return 0;
+}

rotation of matrix by 90 degrees.c

@@ -0,0 +1,26 @@
+#include<stdio.h>
+
+int main()
+{
+    int n;
+    scanf("%d",&n);
+    int mat[n][n],i,j;
+    for(i=0;i<n;i++)
+    {
+        for(j=0;j<n;j++)
+        {
+            scanf("%d",&mat[i][j]);
+        }
+    }
+    for(j=0;j<n;j++)
+    {
+        for(i=n-1;i>=0;i--)
+        {
+            printf("%d ",mat[i][j]);
+        }
+        printf("\n");
+    }
+
+
+    return 0;
+}