1. CSCE 206 Lab Structured Programming in C
Fall 2018
Lecture 6
Ehsanul Haque Nirjhar

2. Pointer
Pointers are variables that stores/points the address of another variables
Address refers to the memory location of a variable

3. Pointer operators
& is the address operator. It refers to the address of a variable.
* is the dereference operator. It refers to value at a specific address.
Why pointer?
Call by reference
Dynamic Memory Allocation

4. Pointer
int main(void) { int var = 50; int *ptr; ptr=&var; printf("value is %d\n", var); printf("value is %d\n", *ptr); printf("Address of value is %d", ptr); return 0; }
Prints:
value is 50
Address of value is 1001

5. Practice Problem-1
Write a program that adds 2 integers using pointer approach. Take 2 integers in 2 variables named a and b. Add those numbers and save it in another variable.
Print the address and values of a,b and c.

6. Practice Problem-2
Write a program that takes 3 integers as input and find the largest number among them. Use pointer variables to do the comparison and output printing.

7. Practice Problem-3
Write a program that takes 2 integers as input and swap their values. You are required to write a function named SwapValues, that takes 2 pointer variables and within the function swap the values. Print the output from main function.