1. Define array. Why do we use arrays in computer programs?

2. Can we store both integer and float types of data in a single array? Demonstrate this by writing a simple C program.

3. Write the indices of the first and last element of the following array declaration. char city [7]={‘S’, ‘I’, ‘L’, ‘C’, ‘H’, ‘A’, ‘R’, };

4. Write a C program and declare an integer type array with capacity 7. Take input to the array from the keyboard. Display the 8th element of the array. Hint: display num[7] if num is the name of the array. Analyze the output.

5. Write a C program and declare an integer type array with 7 elements in it. Display the address of the individual elements in the array.

6. Write a C program and declare two integer type arrays, each with capacity 7. Take input only to the first array. Write a loop to copy the elements of the first array to the second one. Display the elements of the second array.

7. Write a strategy to find the summation of all the even numbers stored in an array. Write a C program for the same. If the array elements are {1, 2, 4, 3, 5, 6, 7, 7, 8}, the output of the program will be 20.

8. Write a strategy to find the summation of all the even positioned numbers stored in an array. Write a C program for the same. If the array elements are {1, 2, 4, 3, 5, 6, 7, 7, 8}, the output of the program will be 18.

9. Write the logic to replace only the first occurrence of an element in an array. For example, if the array elements are {1, 2, 3, 4, 5, 1, 2, 3} and we want to replace element 3 by 0, the array content becomes {1, 2, 0, 4, 5, 1, 2, 3}. Write a complete C program incorporating the logic.

10. Write the logic to replace only the last occurrence of an element in an array. For example, if the array elements are {1, 2, 3, 4, 5, 1, 2, 3} and we want to replace element 3 by 0, the array content becomes {1, 2, 3, 4, 5, 1, 2, 0}. Write a complete C program incorporating the logic.

11. Write a C program to replace all the even positioned elements in an integer array by 0. For example, if the array elements are {1, 2, 3, 9, 5, 5, 7, 1, 9}, it becomes
{1, 0, 3, 0, 5, 0, 7, 0, 9}.

12. Write a strategy to replace all the odd numbers in an integer array by 0. For example, if the array elements are {1, 2, 3, 9, 5, 5, 7, 1, 9}, it becomes {0, 2, 0, 0, 0, 0, 0, 0, 0}. Write a C program for the same.

13. Write a C program to store your name and your mother’s name in two different strings. Display them one after another.

14. Write a C program to declare 3 integer type arrays to store the marks of 10 students scored in 3 different subjects. Take another integer to store the average marks of the students. The average mark of a student is the average of the marks scored by the student in 3 subjects. This should be calculated and inserted by the program. Then you should display the average marks of the students. The program should also display “PASS” or “FAIL” along with the average as per the rule: PASS if average >= 45, FAIL otherwise.

15. Write any two limitations of arrays. Can you store your name and roll number in the same aray?