C language interview questions solution for freshers beginners placement tricky good pointers answers explanation operators data types arrays structures functions recursion preprocessors looping file handling strings switch case if else printf advance linux objective mcq faq online written test prime numbers Armstrong Fibonacci series factorial palindrome code programs examples on c++ tutorials and pdf
Explanation: p is huge pointer, *p is far pointer and **p is char type data variable.
Normalization of huge pointer:
Turbo C compiler is based on 8085 microprocessor in which physical address of memory is represented in 20 bit. Conversion of 4 byte or 32 bit huge address into 20 bit actual physical address is known as normalization.
Formula to calculate physical address:
(q) What will be physical address of huge address 0X59994444?
Explanation: q is far pointer, p is near pointer, *p is double data type constant.
Don’t use huge pointer:
If you will increment huge pointer it will increment both offset and segment address unlike to far pointer which only increments offset address. So if you have little knowledge about huge pointer and you are using huge pointer then you can easily access and modify the IVT, device driver memory, video memory etc. This might be dangerous for your computer.
(q)Why there are three types of pointer in Turbo c compiler?
Turbo c compiler is based on Dos operating system which is based on 8085 microprocessors. In 8085 microprocessor actual physical address is represented in 20 bit. But there are not any pointers which can point 20 bit address. Considering simplicity of calculations, access to actual physical address, security etc. c has introduced three type of pointer i.e. near, far and huge pointer.