diff --git a/README.md b/C/README.md
similarity index 77%
rename from README.md
rename to C/README.md
index c01ca966..d837d3c1 100644
--- a/README.md
+++ b/C/README.md
@@ -34,3 +34,7 @@
 | Program-30 | Program to print the pattern |
 | Program-31 | Program to take the details of student and print the details of students using array and to add details of new students into the existing array |
 | Program-32 | Program to take the details of student and print the details |
+| Program-33 | Program on Arithematic operation using pointers  |
+| Program-34 | Program to determine whether the matrix is a triangular matrix. First, you will be given N, which is the size of the matrix. Then you will be given N rows of integers, where each row consists of N integers separated by spaces. If the input matrix is triangular, then print yes. Otherwise, print no. |
+| Program-35 | Program where you are given a sequence of non-negative integers terminated by -1. You have to output 1 if there are atleast 2 distinct elements in the sequence and 0 if the sequence consists of only 1 integer. Note that -1 is not part of the sequence. The sequence is not necessarily sorted. |
+
diff --git a/program-1/a.out b/C/program-1/a.out
similarity index 100%
rename from program-1/a.out
rename to C/program-1/a.out
diff --git a/program-1/program.c b/C/program-1/program.c
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rename to C/program-1/program.c
diff --git a/program-1/read.md b/C/program-1/read.md
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diff --git a/program-10/program.c b/C/program-10/program.c
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rename to C/program-10/program.c
diff --git a/program-11/program.c b/C/program-11/program.c
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rename to C/program-11/program.c
diff --git a/program-12/program.c b/C/program-12/program.c
similarity index 100%
rename from program-12/program.c
rename to C/program-12/program.c
diff --git a/program-13/program.c b/C/program-13/program.c
similarity index 100%
rename from program-13/program.c
rename to C/program-13/program.c
diff --git a/program-14/program.c b/C/program-14/program.c
similarity index 100%
rename from program-14/program.c
rename to C/program-14/program.c
diff --git a/program-15/a.out b/C/program-15/a.out
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diff --git a/program-15/program.c b/C/program-15/program.c
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diff --git a/program-15/readme.md b/C/program-15/readme.md
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diff --git a/program-16/.vscode/launch.json b/C/program-16/.vscode/launch.json
similarity index 100%
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rename to C/program-16/.vscode/launch.json
diff --git a/program-16/a.out b/C/program-16/a.out
similarity index 100%
rename from program-16/a.out
rename to C/program-16/a.out
diff --git a/program-16/program.c b/C/program-16/program.c
similarity index 100%
rename from program-16/program.c
rename to C/program-16/program.c
diff --git a/program-16/readme.md b/C/program-16/readme.md
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diff --git a/program-17/a.out b/C/program-17/a.out
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diff --git a/program-17/program.c b/C/program-17/program.c
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rename to C/program-17/program.c
diff --git a/program-18/program.c b/C/program-18/program.c
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diff --git a/program-19/a.out b/C/program-19/a.out
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rename to C/program-19/a.out
diff --git a/program-19/program.c b/C/program-19/program.c
similarity index 100%
rename from program-19/program.c
rename to C/program-19/program.c
diff --git a/program-2/program.c b/C/program-2/program.c
similarity index 100%
rename from program-2/program.c
rename to C/program-2/program.c
diff --git a/program-2/read.md b/C/program-2/read.md
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rename from program-2/read.md
rename to C/program-2/read.md
diff --git a/program-20/a.out b/C/program-20/a.out
similarity index 100%
rename from program-20/a.out
rename to C/program-20/a.out
diff --git a/program-20/program.c b/C/program-20/program.c
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rename from program-20/program.c
rename to C/program-20/program.c
diff --git a/program-21/a.out b/C/program-21/a.out
similarity index 100%
rename from program-21/a.out
rename to C/program-21/a.out
diff --git a/C/program-21/program.c b/C/program-21/program.c
new file mode 100644
index 00000000..3fa728fa
--- /dev/null
+++ b/C/program-21/program.c
@@ -0,0 +1,26 @@
+/*
+You are given a sorted (either in the increasing or in the decreasing order) sequence of numbers, ending with a -1. You can assume that are at least two numbers before the ending -1.
+
+Let us call the sequence x0  x1 ... xn -1.
+
+You have to output the number of distinct elements in the sorted sequence.
+
+Kindly do not use arrays in the code.
+*/
+
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int count=0,n=0;
+   while(n!=-1)
+   {
+   scanf("%d",&n);
+    count++;
+
+   }
+printf("%d",count-1);
+    return 0;
+}
diff --git a/program-22/a.out b/C/program-22/a.out
similarity index 100%
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rename to C/program-22/a.out
diff --git a/program-22/program.c b/C/program-22/program.c
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rename from program-22/program.c
rename to C/program-22/program.c
diff --git a/program-23/a.out b/C/program-23/a.out
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diff --git a/program-23/program.c b/C/program-23/program.c
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diff --git a/program-24/a.out b/C/program-24/a.out
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diff --git a/program-24/program.c b/C/program-24/program.c
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diff --git a/program-25/a.out b/C/program-25/a.out
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diff --git a/program-25/program.c b/C/program-25/program.c
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rename to C/program-25/program.c
diff --git a/program-26/a.out b/C/program-26/a.out
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rename from program-26/a.out
rename to C/program-26/a.out
diff --git a/program-26/program.c b/C/program-26/program.c
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rename from program-26/program.c
rename to C/program-26/program.c
diff --git a/program-27/a.out b/C/program-27/a.out
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rename from program-27/a.out
rename to C/program-27/a.out
diff --git a/program-27/program.c b/C/program-27/program.c
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rename from program-27/program.c
rename to C/program-27/program.c
diff --git a/program-28/a.out b/C/program-28/a.out
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rename to C/program-28/a.out
diff --git a/program-28/program.c b/C/program-28/program.c
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rename from program-28/program.c
rename to C/program-28/program.c
diff --git a/program-29/a.out b/C/program-29/a.out
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rename from program-29/a.out
rename to C/program-29/a.out
diff --git a/program-29/program.c b/C/program-29/program.c
similarity index 100%
rename from program-29/program.c
rename to C/program-29/program.c
diff --git a/program-3/program.c b/C/program-3/program.c
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rename from program-3/program.c
rename to C/program-3/program.c
diff --git a/program-30/a.out b/C/program-30/a.out
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rename from program-30/a.out
rename to C/program-30/a.out
diff --git a/program-30/program.c b/C/program-30/program.c
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rename from program-30/program.c
rename to C/program-30/program.c
diff --git a/program-31/a.out b/C/program-31/a.out
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rename from program-31/a.out
rename to C/program-31/a.out
diff --git a/program-31/program.c b/C/program-31/program.c
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rename from program-31/program.c
rename to C/program-31/program.c
diff --git a/program-32/program.c b/C/program-32/program.c
similarity index 100%
rename from program-32/program.c
rename to C/program-32/program.c
diff --git a/C/program-33/program.c b/C/program-33/program.c
new file mode 100644
index 00000000..80f7131f
--- /dev/null
+++ b/C/program-33/program.c
@@ -0,0 +1,14 @@
+/* Arithematic operation using pointers */
+#include <stdio.h>
+void main()
+{
+int a,b;
+int *x,*y;
+scanf("%d%d",&a,&b);
+x=&a;
+y=&b;
+//s=;
+printf("%d\t%d",*x+*y,abs(*x-*y));
+
+}
+
diff --git a/C/program-34/program.c b/C/program-34/program.c
new file mode 100644
index 00000000..4e0af2f0
--- /dev/null
+++ b/C/program-34/program.c
@@ -0,0 +1,36 @@
+/* To determine whether the matrix is a triangular matrix.
+First, you will be given N, which is the size of the matrix.
+
+Then you will be given N rows of integers, where each row consists of
+N integers separated by spaces.
+If the input matrix is triangular, then print yes. Otherwise, print
+no. */
+
+
+
+
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+int a[10][10],n,i,j,flag=0;
+   scanf("%d",&n);
+   for(i=0;i<n;i++)
+   {
+   for(j=0;j<n;j++)
+   {scanf("%d",&a[i][j]);
+   }
+   }
+   for(i=0;i<n;i++)
+   {
+   for(j=0;j<n;j++)
+   {
+   if(!(i==j) &&(i>j || j>i) ) flag=1;
+   }
+   }
+    if(!(flag))printf("no\n");
+    else printf("yes");
+    return 0;
+}
diff --git a/C/program-35/program.c b/C/program-35/program.c
new file mode 100644
index 00000000..97c5c795
--- /dev/null
+++ b/C/program-35/program.c
@@ -0,0 +1,25 @@
+/* You are given a sequence of non-negative integers terminated by -1.
+   You have to output 1 if there are atleast 2 distinct elements in the sequence and 0 if the sequence consists of only 1 integer.
+   Note that -1 is not part of the sequence. The sequence is not necessarily sorted. */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int a=0,n=0,count=0;
+   while(n!=-1)
+   {
+   scanf("%d",&n);
+   if(a!=n)
+   {
+   a=n;
+   count++;
+   }
+
+   }
+if(count>=2) printf("%d",1);
+else printf("%d",0);
+    return 0;
+}
diff --git a/program-4/program.c b/C/program-4/program.c
similarity index 100%
rename from program-4/program.c
rename to C/program-4/program.c
diff --git a/program-5/program.c b/C/program-5/program.c
similarity index 100%
rename from program-5/program.c
rename to C/program-5/program.c
diff --git a/program-6/program.c b/C/program-6/program.c
similarity index 100%
rename from program-6/program.c
rename to C/program-6/program.c
diff --git a/program-7/program.c b/C/program-7/program.c
similarity index 100%
rename from program-7/program.c
rename to C/program-7/program.c
diff --git a/program-8/program.c b/C/program-8/program.c
similarity index 100%
rename from program-8/program.c
rename to C/program-8/program.c
diff --git a/program-9/program.c b/C/program-9/program.c
similarity index 100%
rename from program-9/program.c
rename to C/program-9/program.c
diff --git a/Python/program-1/program.py b/Python/program-1/program.py
new file mode 100644
index 00000000..4648e701
--- /dev/null
+++ b/Python/program-1/program.py
@@ -0,0 +1 @@
+print("Hello, World!")
\ No newline at end of file
diff --git a/Python/program-2/program.py b/Python/program-2/program.py
new file mode 100644
index 00000000..7df869a1
--- /dev/null
+++ b/Python/program-2/program.py
@@ -0,0 +1 @@
+print("Hello, World!")
diff --git a/program-21/program.c b/program-21/program.c
deleted file mode 100644
index 0cfb05d1..00000000
--- a/program-21/program.c
+++ /dev/null
@@ -1,17 +0,0 @@
-#include<stdio.h>
-int main()
-{
-    int a,i,count=0;
-    printf("enter the number\n");
-    scanf("%d",&a);
-    for(i=2;i<=a/2;i++)
-    {
-        if(a%i==0)
-        { 
-            count=1;
-        break;
-    }}
-if(count) printf("not prime");
-else printf("prime");
-return 0;
-}
\ No newline at end of file
diff --git a/readme.md b/readme.md
new file mode 100644
index 00000000..39f1a208
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,2 @@
+# Basic programs
+## This repo contains basics programs in c programming language and python.
\ No newline at end of file