diff --git a/3rd Sem (Data Structure)/array.c b/3rd Sem (Data Structure)/array.c
new file mode 100644
index 0000000..b22de75
--- /dev/null
+++ b/3rd Sem (Data Structure)/array.c	
@@ -0,0 +1,121 @@
+#include<stdio.h>
+#include<conio.h>
+struct Student
+{
+char name[25];
+ int usn;
+ int m1,m2,m3;
+};
+char filename[15];
+int n;
+struct Student s;
+void Insert()
+{
+FILE *fp;
+int i;
+printf("\n\n\tEnter how many Records: ");
+scanf("%d",&n);
+fp=fopen(filename,"w");
+if(fp==NULL) printf("\n\n\tError in Creating the File....");
+else
+for(i=0;i<n;i++)
+{
+ printf("\nEnter Details of Student-%d: ",i+1);
+ printf("\n\t\t\tName: "); scanf("%s",s.name); fprintf(fp,"%s
+",s.name);
+ printf("\n\t\t\tUsn : "); scanf("%d",&s.usn); fprintf(fp,"%d
+",s.usn);
+ printf("\n\t\t\tM1 : "); scanf("%d",&s.m1); fprintf(fp,"%d ",s.m1);
+ printf("\n\t\t\tM2 : "); scanf("%d",&s.m2); fprintf(fp,"%d ",s.m2);
+ printf("\n\t\t\tM3 : "); scanf("%d",&s.m3); fprintf(fp,"%d ",s.m3);
+ }
+ fclose(fp);
+}
+void Search()
+{
+if(n==0)
+printf("\n\n\tNo Records to Search...");
+ else
+ {
+ FILE *fp;
+ int i,flag=0,usn;
+ fp=fopen(filename,"r");
+if(fp==NULL)
+printf("\n\n\tERROR!! in Opening the File....");
+else
+ {
+printf("\n\n\tEnter the Usn to be Searched: ");
+scanf("%d",&usn);
+for(i=0;i<n;i++)
+{
+fscanf(fp,"%s",s.name);
+fscanf(fp,"%d",&s.usn);
+fscanf(fp,"%d",&s.m1);
+fscanf(fp,"%d",&s.m2);
+fscanf(fp,"%d",&s.m3);
+if(usn==s.usn)
+{
+ flag=1;
+ break;
+}
+ }
+ if(flag==1)
+ {
+ printf("\nRecord Exist And Details are:");
+ printf("\n\t\t\t\tName: %s",s.name);
+ printf("\n\t\t\t\tUsn : %d",s.usn);
+ printf("\n\t\t\t\tM1 : %d",s.m1);
+ printf("\n\t\t\t\tM2 : %d",s.m2);
+  printf("\n\t\t\t\tM3 : %d",s.m3);
+ }
+ else
+ printf("\n\n\tRecord having Usn %d Does Not
+Exist...\n\n",usn);
+ }
+ fclose(fp);
+ }
+}
+void Display()
+{
+if(n==0)
+printf("\n\n\tNo Records to Display....\n\n");
+else
+ {
+ int i;
+ FILE *fp=fopen(filename,"r");
+ if(fp==NULL)
+printf("\n\n\tERROR!! in Opening File...");
+ else
+for(i=0;i<n;i++)
+ {
+printf("\nDetails of Student-%d: ",i+1);
+fscanf(fp,"%s",s.name); printf("\n\t\t\tName: %s",s.name);
+fscanf(fp,"%d",&s.usn); printf("\n\t\t\tUsn : %d",s.usn);
+fscanf(fp,"%d",&s.m1); printf("\n\t\t\tM1 : %d",s.m1);
+fscanf(fp,"%d",&s.m2); printf("\n\t\t\tM2 : %d",s.m2);
+fscanf(fp,"%d",&s.m3); printf("\n\t\t\tM3 : %d",s.m3);
+ }
+ fclose(fp);
+ }
+}
+void main()
+{
+int ch;
+clrscr();
+printf("\n\n\tEnter the File Name: ");
+scanf("%s",filename);
+while(1)
+{
+printf("\n\n\t1.Insert...\t2.Search...\t3.display...\t4.Exit...");
+ printf("\n\n\tEnter Your Choice: ");
+ scanf("%d",&ch);
+ switch(ch)
+ {
+ case 1: Insert(); break;
+ case 2: Search(); break;
+ case 3: Display(); break;
+ case 4: exit(0);
+ default: printf("\n\n\tEnter Proper Choice...");
+ }
+ }
+}  
diff --git a/6th sem (Software Testing)/st1.c b/6th sem (Software Testing)/st1.c
new file mode 100644
index 0000000..1adcd2f
--- /dev/null
+++ b/6th sem (Software Testing)/st1.c	
@@ -0,0 +1,49 @@
+#include<stdio.h>
+#include<stdlib.h>
+int main() {
+inta,b,c;
+printf("Enter the sides of the triangle:\n");
+scanf("%d%d%d",&a,&b,&c);
+if((a<1 || a>10)&&(b<1 || b>10)&&(c<1 || c>10))
+printf("Sides a,b and c are of out of range");
+else if((a<1 || a>10)&&(b<1 || b>10))
+printf("Sides a and b are out of range");
+else if((b<1 || b>10)&&(c<1 || c>10))
+printf("Sides b and c are out of range");
+else if((a<1 || a>10)&&(c<1 || c>10))
+printf("Sides a and c are out of range");
+else if(a<1 || a>10)
+printf("side a is out of range.");
+else if(b<1 || b>10)
+printf("side b is out of range.");
+else if(c<1 || c>10)
+printf("side c is out of range.");
+else
+
+{
+if((a<b+c)&&(b<a+c)&&(c<a+b))
+
+{
+printf("Triangle is formed..
+\n");
+if(a==b && b==c && c==a )
+printf("Equilateral triangle..
+\n");
+else if(a==b || b==c || c==a)
+printf("Isoceles triangle..
+\n");
+else
+printf("Scalene triangle...
+\n");
+
+}
+else
+
+{
+printf("not a triangle..\n");
+
+}
+
+}
+return 0;
+}