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Functions in C Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM C INTERVIEW QUESTIONS FUNCTIONS IN C INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

Functions in C Interview Questions & Answers - Learning Mode

A function is a group of statements that together perform a task. Every C program has at least one function, which is main(), and all the most trivial programs can define additional functions. You can divide up your code into separate functions. In general, functions are blocks of code that perform a number of pre-defined commands to accomplish something productive. You can either use the built-in library functions or you can create your own functions. Functions that a programmer writes will generally require a prototype.

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Functions in C Interview Questions & Answers - Learning Mode
Try Functions in C Interview Questions & Answers - Exam Mode
Question: What is a static function?

Answer: A static function is a function whose scope is limited to the current source file. Scope refers to the visibility of a function or variable. If the function or variable is visible outside of the current source file, it is said to have global, or external, scope. If the function or variable is not visible outside of the current source file, it is said to have local, or static, scope. Source: CoolInterview.com
Question: Can you use the function fprintf()to display the output on the screen?

Answer:
Question: Is using exit() the same as using return?

Answer: No. The exit() function is used to exit your program and return control to the operating system. The return statement is used to return from a function and return control to the calling function. If you issue a return from the main() function, you are essentially returning control to the calling function, which is the operating system. In this case, the return statement and exit() function are similar. Source: CoolInterview.com
Question: How would you use the functions randomize()and random()?

Answer:
Question: What are the advantages of the functions?

Answer: ?Debugging is easier<br><br>?It is easier to understand the logic involved in the program<br><br>?Testing is easier<br><br>?Recursive call is possible<br><br>?Irrelevant details in the user point of view are hidden in functions<br><br>?Functions are helpful in generalizing the program Source: CoolInterview.com
Question: What are returned by printf(), scanf() functions,if they return anything means what are that?



Answer: Return type of printf() and scanf() is integer. scanf() returns the no.of variables used and printf() returns the total no.of bytes.
Source: CoolInterview.com
Question: How to use floodfill() function and what is the use of kbhit?

Answer: Flood-fills a bounded region

Declaration: void far floodfill(int x, int y, int border);

Remarks:
floodfill fills an enclosed area on bitmap devices.


The area bounded by the color border is flooded with the current fill
pattern and fill color.

(x,y) is a "seed point".
? If the seed is within an enclosed area,
the inside will be filled.
? If the seed is outside the enclosed area,
the exterior will be filled.
floodfill does not wor Source: CoolInterview.com
Question: How do we get Square root of any number Without using sqrt() function?



Answer: You can use a iterative method for example bisection

#include <stdio.h>
main()
{
int n;
float eval=1.0,x1=0,x2=n,x; //trying to locate root between x1=0 and x2=n and giving a initial dummy value to eval
x=(x1+x2)/2;
printf("Enter value for n n n");
scanf("%d",&n);
while((eval > 0.0001 )||( eval < -0.0001) ) { //you can change accuracy by changing 0.0001 to smaller value
eval= x*x-n;
printf(" eval = %f t",eval); //printf to keep track not n Source: CoolInterview.com
Question: What is the code for clrscr() function?

Answer: clrscr() is a function which creates a screenful of black dots which seems us to be clearing the screen or making a new screen. Source: CoolInterview.com
Question: How can send unlimited no of arguments to a function, eg printf function can take any no of arguments



Answer: using va_list variables in stdarg.h headerfile Source: CoolInterview.com
Question: Differentiate between a linker and linkage?

Answer: A linker converts an object code into an executable code by linking together the necessary build in functions. The form and place of declaration where the variable is declared in a program determine the linkage of variable. Source: CoolInterview.com
Question: How to see return value of main function?

Answer: //this code will print return value of main
static unsigned int nCount = 0;
void NoReturnFunc();
int main()
{
if(0 == nCount)
NoReturnFunc();

return 0;
}

void NoReturnFunc()
{
nCount++;
int nRetValue = main();
printf("Return by main %d",nRetValue);
getch();
} Source: CoolInterview.com
Question: 1. what is a difference between printf and cout . and why printf called a function and cout object as both are used to print data?



Answer: In high level terms, the main differences are type safety (cstdio
doesn't have it), performance (most iostreams implementations are
slower than the cstdio ones) and extensibility (iostreams allows
custom output targets and seamless output of user defined types). Source: CoolInterview.com
Question: Have you heard of "mutable" keyword?



Answer: The mutable keyword can only be applied to non-static and non-const data members of a class. If a data member is declared mutable, then it is legal to assign a value to this data member from a const member function.

SEE FOLLOWING CODE :-

********************************************

class Mutable
{
private :
int m_iNonMutVar;
mutable int m_iMutVar;

public:
Mutable();
void TryChange() const;

};

Mutable::Mutable():m_i Source: CoolInterview.com
Question: How to write a program in c to print its own code?

Answer: //prog.c
#include<stdio.h>
#include<conio.h>
void main()
{
char ch;
FILE *fp;
fp=fopen("prog.c","r");
if(fp)
while((ch=fgetc(fp))!=EOF)
printf("%c",ch);
else
printf("
unable to open file");
getch();
} Source: CoolInterview.com
Question: What is the difference between goto and longjmp() and setjmp()?

Answer: A goto statement implements a local jump of program execution, and the longjmp() and setjmp() functions implement a nonlocal, or far, jump of program execution.

Generally, a jump in execution of any kind should be avoided because it is not considered good programming practice to use such statements as goto and longjmp in your program.

A goto statement simply bypasses code in your program and jumps to a predefined position. To use the goto statement, you give it a labeled position t Source: CoolInterview.com
Question: How to print a statement without using printf() in c?

Answer: using getchar()
main()
{
int i;
char c;
for(i=0;i!='
';i++)
{
c=getchar();
putchar(c,n);
}
getch();
}
Source: CoolInterview.com
Question: How would you use bsearch()function to search a name stored in array of pointers to string?

Answer:
Question: What is the purpose of main( ) function?

Answer: The function main( ) invokes other functions within it.It is the first function to be called when the program starts execution.

?It is the starting function

?It returns an int value to the environment that called the program

?Recursive call is allowed for main( ) also.

?It is a user-defined function

?Program execution ends when the closing brace of the function main( ) is reached.

?It has two arguments 1)argument count and 2) argument vector (repre Source: CoolInterview.com
Question: How do you use a pointer to a function?

Answer: The hardest part about using a pointer-to-function is declaring it.

Consider an example. You want to create a pointer, pf, that points to the strcmp() function.

The strcmp() function is declared in this way:

int strcmp(const char *, const char * )

To set up pf to point to the strcmp() function, you want a declaration that looks just like the strcmp() function?s declaration, but that has *pf rather than strcmp:

int (*pf)( const char *, const char * );

Aft Source: CoolInterview.com

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