Top 100 C Questions Asked in Actual Interviews

**yathish** · 30-12-06, 09:50 PM

Top 100 C Questions Asked in Actual Interviews

**yathish** · 30-12-06, 09:50 PM

30-12-06, 09:50 PM	#1 (permalink)
yathish Moderator Join Date: Sep 2006 Location: Bangalore Posts: 2,409 Thanks: 72 Thanked 287 Times in 234 Posts Thanks: 72 Thanked 287 Times in 234 Posts Rep Power: 56	Top 100 C Questions Asked in Actual Interviews Top 100 C Questions Asked in Actual Interviews Difference between arrays and pointers? http://www.##################/interview/960 What is the purpose of realloc( )? http://www.##################/interview/961 What is static memory allocation and dynamic memory allocation? http://www.##################/interview/962 How are pointer variables initialized? http://www.##################/interview/963 Are pointers integers? http://www.##################/interview/964 What is a pointer variable? http://www.##################/interview/965 What is a pointer value and address? http://www.##################/interview/966 What is a method? http://www.##################/interview/967 What are the advantages of the functions? http://www.##################/interview/968 What is the purpose of main( ) function? http://www.##################/interview/969 What is an argument ? differentiate between formal arguments and actual arguments? http://www.##################/interview/970 What is a function and built-in function? http://www.##################/interview/971 What is modular programming? http://www.##################/interview/972 When does the compiler not implicitly generate the address of the first element of an array? http://www.##################/interview/973 What are the characteristics of arrays in C? http://www.##################/interview/974 Differentiate between a linker and linkage? http://www.##################/interview/975 What are advantages and disadvantages of external storage class? http://www.##################/interview/976 Diffenentiate between an internal static and external static variable? http://www.##################/interview/977 What are the advantages of auto variables? http://www.##################/interview/978 What is storage class and what are storage variable ? http://www.##################/interview/979 Which expression always return true? Which always return false? http://www.##################/interview/980 Write the equivalent expression for x%8? http://www.##################/interview/981 why n++ executes faster than n+1? http://www.##################/interview/982 what is a modulus operator? What are the restrictions of a modulus operator? http://www.##################/interview/983 What is the difference between a string and an array? http://www.##################/interview/984 Is it better to use a pointer to navigate an array of values,or is it better to use a subscripted array name? http://www.##################/interview/985 Can the sizeof operator be used to tell the size of an array passed to a function? http://www.##################/interview/986 Is using exit() the same as using return? http://www.##################/interview/987 Is it possible to execute code even after the program exits the main() function? http://www.##################/interview/988 What is a static function? http://www.##################/interview/989 Why should I prototype a function? http://www.##################/interview/990 How do you print an address? http://www.##################/interview/991 Can math operations be performed on a void pointer? http://www.##################/interview/992 How can you determine the size of an allocated portion of memory? http://www.##################/interview/993 What is a "null pointer assignment" error? What are bus errors, memory faults, and core dumps? http://www.##################/interview/994 What is the difference between NULL and NUL? http://www.##################/interview/995 What is the heap? http://www.##################/interview/996 Can the size of an array be declared at runtime? http://www.##################/interview/997 What is the stack? http://www.##################/interview/998 When should a far pointer be used? http://www.##################/interview/999 What is the difference between far and near? http://www.##################/interview/1000 Is it better to use malloc() or calloc()? http://www.##################/interview/1001 Why should we assign NULL to the elements (pointer) after freeing them? http://www.##################/interview/1002 When would you use a pointer to a function? http://www.################## /interview/1003 How do you use a pointer to a function? http://www.##################/interview/1004 Can you add pointers together? Why would you? http://www.##################/interview/1005 What does it mean when a pointer is used in an if statement? http://www.##################/interview/1006 Is NULL always defined as 0? http://www.##################/interview/1007 What is a void pointer? http://www.##################/interview/1008 What is a null pointer? http://www.##################/interview/1009 How many levels of pointers can you have? http://www.##################/interview/1010 What is indirection? http://www.##################/interview/1011 How do you print only part of a string? http://www.##################/interview/1012 How can I convert a string to a number? http://www.##################/interview/1013 How can I convert a number to a string? http://www.##################/interview/1014 What is the difference between a string copy (strcpy) and a memory copy (memcpy)? When should each be used? http://www.##################/interview/1015 How can you check to see whether a symbol is defined? http://www.##################/interview/1016 How do you override a defined macro? http://www.##################/interview/1017 What is #line used for? http://www.##################/interview/1018 What is a pragma? http://www.##################/interview/1019 What are the standard predefined macros? http://www.##################/interview/1020 How can type-insensitive macros be created? http://www.##################/interview/1021 How many levels deep can include files be nested? http://www.##################/interview/1022 Can include files be nested? http://www.##################/interview/1023 Can you define which header file to include at compile time? http://www.##################/interview/1024 What is the difference between #include and #include "file"? http://www.##################/interview/1025 Is it better to use a macro or a function? http://www.##################/interview/1026 How are portions of a program disabled in demo versions? http://www.##################/interview/1027 What is the benefit of using an enum rather than a #define constant? http://www.##################/interview/1028 What is the benefit of using #define to declare a constant? http://www.##################/interview/1029

30-12-06, 09:50 PM	#2 (permalink)
yathish Moderator Join Date: Sep 2006 Location: Bangalore Posts: 2,409 Thanks: 72 Thanked 287 Times in 234 Posts Thanks: 72 Thanked 287 Times in 234 Posts Rep Power: 56	Re: Top 100 C Questions Asked in Actual Interviews Can a file other than a .h file be included with #include? http://www.##################/interview/1030 How can you avoid including a header more than once? http://www.##################/interview/1031 What will the preprocessor do for a program? http://www.##################/interview/1032 What is a macro, and how do you use it? What is Preprocessor? http://www.##################/interview/1034 How can I make sure that my program is the only one accessing a file? http://www.##################/interview/1035 How can I open a file so that other programs can update it at the same time? http://www.##################/interview/1036 How do you determine whether to use a stream function or a low-level function? http://www.##################/interview/1037 What is the difference between text and binary modes? http://www.##################/interview/1038 How can you restore a redirected standard stream? http://www.##################/interview/1039 How do you redirect a standard stream? http://www.##################/interview/1040 How can I search for data in a linked list? http://www.##################/interview/1041 How can I sort a linked list? http://www.##################/interview/1042 What is hashing? http://www.##################/interview/1043 What is the quickest searching method to use? http://www.##################/interview/1044 What is the easiest searching method to use? http://www.##################/interview/1045 How can I sort things that are too large to bring into memory? http://www.##################/interview/1046 What is the quickest sorting method to use? http://www.##################/interview/1047 What is the easiest sorting method to use? http://www.################## /interview/1048 What is the benefit of using const for declaring constants? http://www.##################/interview/1049 Can static variables be declared in a header file? http://www.##################/interview/1050 What is the difference between declaring a variable and defining a variable? http://www.##################/interview/1051 Is it acceptable to declare/define a variable in a C header? http://www.##################/interview/1052 When should a type cast not be used? http://www.##################/interview/1053 When should a type cast be used? http://www.##################/interview/1054 How can you determine the maximum value that a numeric variable can hold? http://www.##################/interview/1055 How reliable are floating-point comparisons? http://www.##################/interview/1056 Can a variable be both const and volatile? http://www.##################/interview/1057 when should the volatile modifier be used? http://www.##################/interview/1058 When should the register modifier be used? Does it really help? http://www.##################/interview/1059

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