Q:
What is the difference between const and macro?
belongs to collection: Embedded C interview questions and answers (2022)
Embedded C interview questions and answers (2022)
- What is the difference between C and embedded C?
- What is the volatile keyword?
- What is the use of volatile keyword?
- What is the difference between the const and volatile qualifiers in C?
- Can a variable be both constant and volatile in C?
- Can we have a volatile pointer?
- The Proper place to use the volatile keyword?
- What is ISR?
- Can we pass any parameter and return a value from the ISR?
- What is interrupt latency?
- How do you measure interrupt latency?
- How to reduce interrupt latency?
- Is it safe to call printf() inside Interrupt Service Routine (ISR)?
- Can we put a breakpoint inside ISR?
- What is the difference between an uninitialized pointer and a null pointer?
- What are the causes of Interrupt Latency?
- Can we use any function inside ISR?
- What is a nested interrupt?
- What is NVIC in ARM Cortex?
- Can we change the interrupt priority level of Cortex-M processor family?
- Why “C” language mostly preferred than assembly language?
- What is the start-up code?
- What are the start-up code steps?
- Infinite loops often arise in embedded systems. How do you code an infinite loop in C?
- How to access the fixed memory location in embedded C?
- Difference between RISC and CISC processor?
- What is the stack overflow?
- What is the cause of the stack overflow?
- What is the difference between the I2c and SPI communication Protocols?
- What is the difference between Asynchronous and Synchronous Communication?
- What is the difference between RS232 and RS485?
- What is the difference between Bit Rate and Baud Rate?
- What is segmentation fault in C?
- What are the common causes of segmentation fault in C?
- What is the difference between Segmentation fault and Bus error?
- Size of the integer depends on what?
- Are integers signed or unsigned?
- What is a difference between unsigned int and signed int in C?
- What is the difference between const and macro?
- How to set, clear, toggle and checking a single bit in C?
- What will be the output of the below C program?
- Write a program swap two numbers without using the third variable?
- What will be the output of the below C program?
- What is meant by structure padding?
- What is the endianness?
- What is big-endian and little-endian?
- Write a C program to check the endianness of the system
- How to Convert little-endian to big-endian vice versa in C?
- What is static memory allocation and dynamic memory allocation?
- What is the memory leak in C?
- What is the output of the below C code?
- What is the output of the below C code?
- What is the difference between malloc and calloc?
- What is the purpose of realloc( )?
- What is the return value of malloc (0)?
- What is dynamic memory fragmentation?
- How is the free work in C?
- What is a Function Pointer?
- How to declare a pointer to a function in C?
- Where can the function pointers be used?
- Write a program to check an integer is a power of 2?
- What is the output of the below code?
- What is the output of the below code?
- Write a program to count set bits in an integer?
- What is void or generic pointers in C?
- What is the advantage of a void pointer in C?
- What are dangling pointers?
- What is the wild pointer?
- What is a NULL pointer?
- What are the post-increment and decrement operators?
- Which one is better: Pre-increment or Post increment?
- How will you protect a pointer by some accidental modification with the pointer address?
- How to use a variable in a source file that is defined in another source file?
- Can static variables be declared in a header file?
- What is the difference between pass by value by reference in c and pass by reference in c?
- What is a reentrant function?
- What is the inline function?
- What is the advantage and disadvantage of the inline function?
- What is virtual memory?
- How can you protect a character pointer by some accidental modification with the pointer address?
- Consider the two statements and find the difference between them?
- Can structures be passed to the functions by value?
- What are the limitations of I2C interface?
- What is the Featured of CAN Protocol?
- What is priority inversion?
- What is priority inheritance?
- Significance of watchdog timer in Embedded Systems?
- What Is Concatenation Operator in Embedded C?
C programming
Answer:
- The const keyword is handled by the compiler, in another hand, a macro is handled by the preprocessor directive.
- const is a qualifier that is modified the behavior of the identifier but macro is preprocessor directive.
- There is type checking is occurred with const keyword but does not occur with #define.
- const is scoped by C block, #define applies to a file.
- const can be passed as a parameter (as a pointer) to the function. In the case of call by reference, it prevents to modify the passed object value.
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