Demonstration Program of 2 dimension Array and Pointers | Data Structure Using C

TL;DR

Learn how to use two-dimensional arrays and pointers in a simple program quiz.

Transcript

hello dear students let's revise the concept of two-dimensional array and pointers using a very simple program in fact it's like a quiz now you can see that in this program we have declared a two dimensional array containing three rows and three columns named as a and i have initialized it such that row 0 will store 10 20 30 correct 3 values row 1 ... Read More

Key Insights

• ❓ Two-dimensional arrays are collections of one-dimensional arrays.
• ⚾ Base addresses can be obtained by using the notation "a0" or "a[i]".
• ❓ The notation "a[i][j]" is equivalent to "(a+i)+j" or "(a[i]+j)".
• ♿ Accessing values in a two-dimensional array can be done using double asterisks with "a" or "a[i][j]".

Questions & Answers

Q: Why are addresses printed using "%u" instead of "%d"?

Addresses are unsigned and cannot be negative, so "%u" is used. It denotes that the value being printed is an address and will always be positive.

Q: What is the base address of the zeroth one-dimensional array?

The base address of the zeroth one-dimensional array is 100.

Q: How can we access the value at the second row and first column?

We can access this value using the notation "a[2][1]" or "*(a+2)+1". Both notations will give us the value stored at the second row, first column.

Q: What does simply using the name "a" represent?

Using the name "a" represents the base address of the zeroth row in the two-dimensional array.

Summary & Key Takeaways

• The content explains the initialization of a three by three matrix using a two-dimensional array, with each row containing three values.

• It discusses the concept of base addresses for one-dimensional arrays within the two-dimensional array.

• The video demonstrates various notations and their equivalence in accessing values and addresses within the array.