diff --git a/Sem1/C_Programming/10fibofact.c b/Sem1/C_Programming/10fibofact.c
new file mode 100644
index 0000000..3fe09c2
--- /dev/null
+++ b/Sem1/C_Programming/10fibofact.c
@@ -0,0 +1,36 @@
+/*Write a Menu Driven C Program to implement the following using recursion
+a. Factorial of a number
+b. Fibonacci series
+*/
+#include<stdio.h>
+int main()
+{
+int fibo[10],i,ch,n,fact=1;
+printf("1.Factorial of a number\n2.Fibonacci series\nenter your choice");
+scanf("%d",&ch);
+switch(ch){
+case 1:
+{
+printf("Enter the number to factorial\n");
+scanf("%d",&n);
+//printf("n=%d",n);
+for(i=n;i>0;i--)
+fact*=i;
+printf("Factorial of %d=%d\n",n,fact);
+break;
+}
+case 2:
+{
+printf("Enter the number to fibonaci series\n");
+scanf("%d",&n);
+fibo[0]=0;fibo[1]=1;
+for(i=2;i<=n;i++)
+fibo[i]=fibo[i-2]+fibo[i-1];
+printf("Fibonaci series\n");
+for(i=0;i<n;i++)
+printf("%d\n",fibo[i]);
+break;
+}
+}
+return 0;
+}
diff --git a/Sem1/C_Programming/11compaddsub.c b/Sem1/C_Programming/11compaddsub.c
new file mode 100644
index 0000000..fbf01b2
--- /dev/null
+++ b/Sem1/C_Programming/11compaddsub.c
@@ -0,0 +1,35 @@
+#include<stdio.h>
+void add();
+void sub();
+struct compl
+{
+int img;
+int real;
+};
+void main()
+{
+
+ int i;
+printf("enter the real & img no\n");
+struct compl cn[2];
+for(i=0;i<2;i++)
+{
+scanf("%d%d",&cn[i].real,&cn[i].img);
+}
+add(cn);
+sub(cn);
+}
+void add(struct compl cn[])
+{
+int real1,img1;
+real1=cn[0].real+cn[1].real;
+img1=cn[0].img+cn[1].img;
+printf("sum of complex no:%d+%di\n",real1,img1);
+}
+void sub(struct compl cn[])
+{
+int real1,img1;
+real1=cn[0].real-cn[1].real;
+img1=cn[0].img-cn[1].img;
+printf("diff of complex no:%d+%di\n",real1,img1);
+}
diff --git a/Sem1/C_Programming/8magicmatrix.c b/Sem1/C_Programming/8magicmatrix.c
new file mode 100644
index 0000000..4584d0c
--- /dev/null
+++ b/Sem1/C_Programming/8magicmatrix.c
@@ -0,0 +1,34 @@
+//Write a C program to implement a magic square of size n.
+#include<stdio.h>
+int main()
+{
+int ord,i,j,a[10][10],dig1=0,dig2=0;
+printf("enter order of matrix(should be square matrix)\n");
+scanf("%d", &ord);
+printf("Enter the elements\n");
+for(i=0;i<ord;i++)
+{
+for(j=0;j<ord;j++)
+{
+scanf("%d",&a[i][j]);
+}
+}
+//for 1st dialgonal
+for(i=0;i<ord;i++)
+{
+for(j=0;j<ord;j++)
+{
+if(i==j)
+dig1+=a[i][j];
+if(i+j==ord-1)
+dig2+=a[i][j];
+}
+}
+if((dig1==dig2))
+printf("Magic matrix");
+else
+printf("Not magic matrix");
+
+
+return 0;
+}
diff --git a/Sem1/C_Programming/9addint.c b/Sem1/C_Programming/9addint.c
new file mode 100644
index 0000000..a3b4d8f
--- /dev/null
+++ b/Sem1/C_Programming/9addint.c
@@ -0,0 +1,66 @@
+/*Write a Menu driven C program to
+a. Accept two numbers n and m
+b. Sum of all integers ranging from n to m
+c. Sum of all odd integers ranging from n to m
+d. Sum of all even integers ranging from n to m
+Display an error message if n > m. Create functions for each of the options
+*/
+#include<stdio.h>
+void sum1(int m,int n);
+void sum2(int m,int n);
+void sum3(int m,int n);
+int i;
+int main()
+{
+int m,n,ch;
+printf("1.sum of all integers\n2.sum of all odd integers\n3.sum of all even integers\nenter your choice\n");
+scanf("%d",&ch);
+read:
+printf("enter m and n values\n");
+scanf("%d %d",&m,&n);
+if(m>n)
+{
+printf("please re-enter values\n");
+goto read;
+}
+switch(ch)
+{
+case 1:
+sum1(m,n);
+break;
+case 2:
+sum2(m,n);
+break;
+case 3:
+sum3(m,n);
+break;
+default:
+printf("invalid choice");
+break;
+}
+
+return 0;
+}
+
+void sum1(int m, int n)
+{ int sum=0;
+for(i=m;i<=n;i++)
+sum=sum+i;
+printf("Sum of all integers are %d\n",sum);
+}
+void sum2(int m, int n)
+{
+int sum=0;
+for(i=m;i<=n;i++)
+{if(i%2==1)
+sum=sum+i;}
+printf("Sum of all odd integers are %d\n",sum);
+}
+void sum3(int m, int n)
+{
+int sum=0;
+for(i=m;i<=n;i++)
+{if(i%2==0)
+sum=sum+i;}
+printf("Sum of all even integers are %d\n",sum);
+}