C Objective Questions for Practitioners

Hint:
Mathematics related functions like pow(), sqrt() belongs to math.h header file.

Hint:
mathio.h is not a predefined header file. However we can create our own header files with any name.

Hint:
This is very important difference in size_of() and strlen() functions. strlen() returns no of chracters in any string. While size_of() operator returns the size which is actually including '\0' (null) character, null character is inserted at the end of all strings in C programming.

Hint:
C Language doesn't supports the feature of having two functions with the same name. This is a feature of object oriented programming like C++.

Hint:
Solve more questions on functions here - https://www.cppbuzz.com/interview-questions-on-function-in-c

Hint:
This code has 25 iterations of for loops that is why count++ is executed 25 times hence its value becomes 25.

Hint:
You might be thinking that it should print 5 times but it is printing 1 time only because for loop is terminated by ; which means for loop will run 5 times but printf() is not part of that loop.

Hint:
if we put ; after for() then for loop doesn't run anything which is inside {}

Hint:
while(1) means while will run for forever it also means while(true)

Hint:
While(1) is always infinite loop in C programming. So while will run but since it is terminated by ; and printf() is not part of it.

Hint:
Here while loop is evaluated as while(0) which means while loop will not be executed.

Hint:
Here while loop is evaluated as while(0) because it has a post increment operator and a is incremented later after while loop. While(0) means loop will not run.

Hint:
Here while loop is evaluated as while(0) because it has post increment operator. And since while(0) is terminated by ; so printf() will not be part of it and hence it is printed 1 time.

Hint:
Here while loop is executed for a = 0 to a = 4 which is 5 times execuation hence CppBuzz.com is printed 5 times.

Hint:
To understand it you have to convert 320 to binary form which is 101000000, (9 digits) Now code is typecasting this value to char*, which takes 8 bits; so from the 9 digits ptr will stor only 8 values (01000000) which comes 64.

Hint:
The output is "The C", but the compiler will throw a warning - Size of arr is 5 but the code is trying to assign string which is more than 5

Hint:
Declaration like int sum(int, int); is allowed number of times but definition int sum(int a, int b) { return a+b; } is allowed only one time. Multiple definition of same function is compilation error ( redefinition error )

Hint:
Function can return only one value. If you want to return group of values then create a structure and return it.

Hint:
atoi() is predefined function which convert string into numberic value

Hint:
Here gcvt() is converting first 2 digit to string

Hint:
function f() is returning address of variable a. Pointer temp is assigned with the address of variable a.

Hint:
statement printf("%", temp); will not print anything. If we want it to print anything then use printf("%c", temp);