diff --git a/program-1/a.out b/program-1/a.out
new file mode 100755
index 00000000..3448b52e
Binary files /dev/null and b/program-1/a.out differ
diff --git a/program-23/a.out b/program-23/a.out
new file mode 100755
index 00000000..99981a39
Binary files /dev/null and b/program-23/a.out differ
diff --git a/program-23/program.c b/program-23/program.c
new file mode 100644
index 00000000..b78c8f62
--- /dev/null
+++ b/program-23/program.c
@@ -0,0 +1,13 @@
+#include<stdio.h>
+int main()
+{
+   int n,count=0;
+    printf("Enter the number\n");
+    scanf("%d",&n);
+    while(n!=0)
+    {
+        count++;
+        n/=10;
+    }
+printf("number of digits =%d\n",count);
+}
\ No newline at end of file
diff --git a/program-24/a.out b/program-24/a.out
new file mode 100755
index 00000000..d8f80262
Binary files /dev/null and b/program-24/a.out differ
diff --git a/program-24/program.c b/program-24/program.c
new file mode 100644
index 00000000..f068ced1
--- /dev/null
+++ b/program-24/program.c
@@ -0,0 +1,15 @@
+#include<stdio.h>
+int main()
+{
+   int i,j,r,c;
+    printf("Enter the number of rows and columns\n");
+    scanf("%d%d",&r,&c);
+    for(i=0;i<r;i++)
+    {
+        for(j=0;j<c;j++)
+        {
+            printf("*");
+        }
+        printf("\n");
+    }
+}
\ No newline at end of file
diff --git a/program-25/a.out b/program-25/a.out
new file mode 100755
index 00000000..83930e91
Binary files /dev/null and b/program-25/a.out differ
diff --git a/program-25/program.c b/program-25/program.c
new file mode 100644
index 00000000..15e04372
--- /dev/null
+++ b/program-25/program.c
@@ -0,0 +1,15 @@
+#include<stdio.h>
+int main()
+{
+   int i,j,r;
+    printf("Enter the number of rows\n");
+    scanf("%d",&r);
+    for(i=0;i<r;i++)
+    {
+        for(j=0;j<=i;j++)
+        {
+            printf("*");
+        }
+        printf("\n");
+    }
+}
\ No newline at end of file
diff --git a/program-26/a.out b/program-26/a.out
new file mode 100755
index 00000000..8a517270
Binary files /dev/null and b/program-26/a.out differ
diff --git a/program-26/program.c b/program-26/program.c
new file mode 100644
index 00000000..7a338038
--- /dev/null
+++ b/program-26/program.c
@@ -0,0 +1,16 @@
+#include<stdio.h>
+int main()
+{
+   /*initialization */
+    int n,i,j,count=0;
+    printf("enter the number of rows\n"); /*Input the number of rows */
+    scanf("%d",&n);
+    for(i=1;i<=n;i++)   /*condition */
+    {
+        for(j=1;j<=i;j++)
+        {
+            printf("\t%d",count++); /*output */
+        }
+        printf("\n");
+    }return 0;
+}
\ No newline at end of file
diff --git a/program-27/a.out b/program-27/a.out
new file mode 100755
index 00000000..447dbe46
Binary files /dev/null and b/program-27/a.out differ
diff --git a/program-27/program.c b/program-27/program.c
new file mode 100644
index 00000000..67fe076c
--- /dev/null
+++ b/program-27/program.c
@@ -0,0 +1,23 @@
+#include<stdio.h>
+int main()
+{
+   int i,j,r;
+    printf("Enter the number of rows\n");
+    scanf("%d",&r);
+    for(i=0;i<r;i++)
+    {
+        for(j=0;j<=i;j++)
+        {
+            printf("\t*");
+        }
+        printf("\n");
+    }//printf("%d\t%d\n",i,j);
+    for(i-=1;i>0;i--)   
+    {
+        for(j=i;j>0;j--)
+        {
+            printf("\t*"); 
+        }
+        printf("\n");
+    }
+}
\ No newline at end of file
diff --git a/program-28/a.out b/program-28/a.out
new file mode 100755
index 00000000..b78b3ff4
Binary files /dev/null and b/program-28/a.out differ
diff --git a/program-28/program.c b/program-28/program.c
new file mode 100644
index 00000000..47414529
--- /dev/null
+++ b/program-28/program.c
@@ -0,0 +1,16 @@
+#include<stdio.h>
+int main()
+{
+   /*initialization */
+    int n,i,j;
+    printf("enter the number of rows\n"); /*Input the number of rows */
+    scanf("%d",&n);
+    for(i=n;i>0;i--)   /*condition */
+    {
+        for(j=i;j>0;j--)
+        {
+            printf("\t*"); /*output */
+        }
+        printf("\n");
+    }return 0;
+}
\ No newline at end of file
diff --git a/program-29/a.out b/program-29/a.out
new file mode 100755
index 00000000..fa643187
Binary files /dev/null and b/program-29/a.out differ
diff --git a/program-29/program.c b/program-29/program.c
new file mode 100644
index 00000000..ad8fb79f
--- /dev/null
+++ b/program-29/program.c
@@ -0,0 +1,24 @@
+#include<stdio.h>
+int main()
+{
+   int i,j,r;
+    printf("Enter the number of rows\n");
+    scanf("%d",&r);
+    for(i=0;i<r;i++)
+    {
+        for(j=0;j<=i;j++)
+        {
+            printf("\t%d",j);
+        }
+        printf("\n");
+    }
+    for(i-=1;i>0;i--)   
+    {int x=0;
+        for(j=i;j>0;j--)
+        {
+            
+            printf("\t%d",x++); 
+        }
+        printf("\n");
+    }
+}
\ No newline at end of file
diff --git a/program-30/a.out b/program-30/a.out
new file mode 100755
index 00000000..db007813
Binary files /dev/null and b/program-30/a.out differ
diff --git a/program-30/program.c b/program-30/program.c
new file mode 100644
index 00000000..0d0b9830
--- /dev/null
+++ b/program-30/program.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+int main()
+{
+    int i, space, rows, k=0;
+    printf("Enter number of rows: ");
+    scanf("%d",&rows);
+    for(i=1; i<=rows; ++i, k=0)
+    {
+        for(space=1; space<=rows-i; ++space)
+        {
+            printf("  ");
+        }
+        while(k != 2*i-1)
+        {
+            printf("* ");
+            ++k;
+        }
+        printf("\n");
+    }
+    
+    return 0;
+}
\ No newline at end of file