diff --git a/C/.gitignore b/C/.gitignore
index d6b7ef3..c8a9d02 100644
--- a/C/.gitignore
+++ b/C/.gitignore
@@ -1,2 +1,2 @@
-*
+
 !.gitignore
diff --git a/C/195515.c b/C/195515.c
new file mode 100644
index 0000000..e5690ee
--- /dev/null
+++ b/C/195515.c
@@ -0,0 +1,8 @@
+#include<stdio.h>
+#include<conio.h>
+int main()
+{
+	printf("Hello World");
+	getch();
+	return 0;
+}
diff --git a/C/195515.exe b/C/195515.exe
new file mode 100644
index 0000000..3260b91
Binary files /dev/null and b/C/195515.exe differ
diff --git a/C/195515a.c b/C/195515a.c
new file mode 100644
index 0000000..7d0ac7c
--- /dev/null
+++ b/C/195515a.c
@@ -0,0 +1,12 @@
+#include<stdio.h>
+#include<conio.h>
+int main()
+{
+	int a,b,sum;
+	printf("enter two numbers:\n");
+	scanf("%d%d",&a,&b);
+	sum=a+b;
+	printf("sum=%d",sum);
+	getch();
+	return 0;
+}
diff --git a/C/195515a.exe b/C/195515a.exe
new file mode 100644
index 0000000..6271cc4
Binary files /dev/null and b/C/195515a.exe differ
diff --git a/C/195515b.c b/C/195515b.c
new file mode 100644
index 0000000..3551ec0
--- /dev/null
+++ b/C/195515b.c
@@ -0,0 +1,12 @@
+#include<stdio.h>
+#include<conio.h>
+int main()
+{
+	int a,b,sub;
+	printf("enter two numbers:\n");
+	scanf("%d%d",&a,&b);
+	sub=a-b;
+	printf("sub=%d",sub);
+	getch(); 
+	return 0;
+}
diff --git a/C/195515b.exe b/C/195515b.exe
new file mode 100644
index 0000000..29436ef
Binary files /dev/null and b/C/195515b.exe differ
diff --git a/C/195515c.c b/C/195515c.c
new file mode 100644
index 0000000..b6a0ea7
--- /dev/null
+++ b/C/195515c.c
@@ -0,0 +1,12 @@
+#include<stdio.h>
+#include<conio.h>
+int main()
+{
+	int a,b,multiply;
+	printf("enter two numbers:\n");
+	scanf("%d%d",&a,&b);
+	multiply=a*b;
+	printf("multiply=%d",multiply);
+	getch();
+	return 0;
+}
diff --git a/C/195515c.exe b/C/195515c.exe
new file mode 100644
index 0000000..47c3616
Binary files /dev/null and b/C/195515c.exe differ
diff --git a/C/195515d.c b/C/195515d.c
new file mode 100644
index 0000000..02ed40a
--- /dev/null
+++ b/C/195515d.c
@@ -0,0 +1,15 @@
+#include<stdio.h>
+#include<conio.h>
+int main()
+{
+	int a,mul=1,i;
+	printf("enter five numbers:\n");
+	for(i=1;i<=5;i++);
+	{
+		scanf("%d",&a);
+		mul=mul*a;
+	}
+	printf("mul=%d",mul);
+	getch();
+	return 0;
+}
diff --git a/C/195515d.exe b/C/195515d.exe
new file mode 100644
index 0000000..6c3d3a8
Binary files /dev/null and b/C/195515d.exe differ
diff --git a/C/a1.c b/C/a1.c
new file mode 100644
index 0000000..0f43414
--- /dev/null
+++ b/C/a1.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include<conio.h>
+void main()
+{
+	int a,b,temp;
+	printf("enter two nos.:\n");
+	scanf("%d%d",&a,&b);
+	temp=a;
+	a=b;
+	b=temp;
+	printf(" the value of a is %d and b is %d",a,b);
+
+}
diff --git a/C/a1.exe b/C/a1.exe
new file mode 100644
index 0000000..cadff6d
Binary files /dev/null and b/C/a1.exe differ
diff --git a/C/project4.c b/C/project4.c
new file mode 100644
index 0000000..10717bd
--- /dev/null
+++ b/C/project4.c
@@ -0,0 +1,11 @@
+#include<stdio.h>
+#include<conio.h>
+int main()
+{
+	int a,b,mean;
+	printf("enter two numbers:\n");
+	scanf("%d%d",&a,&b);
+mean=(a+b)/2;
+	printf("average=%d",mean);
+	return 0;
+}
diff --git a/C/project4.exe b/C/project4.exe
new file mode 100644
index 0000000..008a140
Binary files /dev/null and b/C/project4.exe differ
diff --git a/HacktoberFest2k19 b/HacktoberFest2k19
new file mode 160000
index 0000000..48ed83d
--- /dev/null
+++ b/HacktoberFest2k19
@@ -0,0 +1 @@
+Subproject commit 48ed83d87222a407a3c6544aebcd9abb95219abb