The document discusses arrays in C programming. It defines arrays as collections of data of the same type with a common name. It shows different ways to declare and initialize arrays, as well as examples of accessing array elements using indexes and looping through arrays using for loops. It also demonstrates storing different data types in separate arrays and calculating totals by accessing corresponding elements from each array.

1. ARRAY

2. #include<stdio.h>
int main()
{
float student1,student2,student3,student4,
student5,student6,student7,student8,student9
…………………….;
printf("enter 1st student mark:");
scanf("%f",&student1);
printf("enter 2nd student mark:");
scanf("%f",&student2);
printf("enter 3rd student mark:");
scanf("%f",&student3);
……………………………………………….}

3. ARRAY is a collection of data items
All of the same type
A common name
Array declaration syntax:
data_type arr_name [arr_size];
int mark[120];

5. INDEX:
int mark[5];
mark[0]=45;
mark[1]=56;
mark[2]=40;
mark[3]=58;
mark[4]=78;
int mark[5]={45,56,40,58,78};
Size =[n] Index=( [0] – [n-1] )

6. #include<stdio.h>
int main()
{
int mark [5];
mark[0]=45;
mark[1]=56;
mark[2]=40;
mark[3]=58;
mark[4]=78;
printf("%d",num[0]); //try other index
}

7. #include<stdio.h>
int main()
{
int mark[5]={45,56,40,58,78};
printf("%d",num[0]); //try other index
}

8. #include<stdio.h>
main()
{
int num[5]={87,45,48,4,2};
int i;
for(i=0;i<=4;i++)
printf("num[%d]=%dn",i,num[i]);
}

9. #include<stdio.h>
main()
{
int num[5];
int i;
printf("enter student math markn");
for(i=0;i<=4;i++)
{ printf("student %d:",i+1);
scanf("%d",&num[i]);
}
printf("show student markn");
for(i=0;i<=4;i++)
{ printf("student%d math mark:%dn",i+1,num[i]); }
}

10. #include<stdio.h>
main()
{ int math[5],eng[5];
int i;
printf("enter student math markn");
for(i=0;i<=4;i++)
{ printf("student %d:",i+1);
scanf("%d",&math[i]);
}
printf("enter student english markn");
for(i=0;i<=4;i++)
{ printf("student %d:",i+1);
scanf("%d",&eng[i]);
}
printf("show student total markn");
for(i=0;i<=4;i++)
{printf("student%d total mark:%dn",i+1,math[i]+eng[i]); } }

11. Assignment:
Input 5 student name ,math mark,physics mark
and show name with total mark.