C interview questions
- What is a function?
- What is the advantage of using functions?
- What is the syntax to define a function?
- What is the function prototype?
- Difference between function declaration and definition?
- What is built in function?
- What is user defined function?
- What is an argument and what is the parameter?
- What is the formal argument and what is the actual argument?
- Can we return more than one value by using a return statement?
- How to return more than one value from a function?
- Can we place more than one return statement in one function?
- Give an example for a function returning void but contains a return statement?
- What is the difference between K & R C style and ANSI C style?
- What is the difference between call by value mech and call by address mech(call by reference)?
- main is built in function or user-defined function?
- What is the use of the main function?
- Can we change the name of the main function?
- Write a small ‘c’ function to receive any number of arguments?
- What is recursion?
- Is it possible to declare the static function in c language?
- What are storage classes in ‘C’ language?
- What are storage class specifiers in ‘C’ language?
- How many scopes are there in ‘C’ language?
C interview questions for beginners
What is the output of the following code?
#include<stdio.h>
int main() {
int i;
for (i = 0; i < 5; i++) {
static int a = 0;
int b = 0;
a++;
b++;
printf("\na=%d", a);
printf(",b=%d", b);
}
return 0;
}
What is the output of the following code?
#include<stdio.h>
extern int a;
int main() {
printf("\na=%d", a);
return 0;
}
What is the output of the following code?
#include<stdio.h>
extern int a;
int main() {
printf("\n a = %d", a);
return 0;
}
int a;
What is the output of the following code?
#include<stdio.h>
extern int a = 5;
int main() {
printf("\n a = %d", a);
return 0;
}
int a;
What is the output of the following code?
#include<stdio.h>
void fun(int _) {
printf("%d", _);
}
int main() {
fun(23);
return 0;
}
What is the output of the following code?
#include<stdio.h>
void fun(auto int a) {
printf("%d", a);
}
int main() {
fun(23);
return 0;
}
What is the output of the following code?
#include<stdio.h>
void fun(register int a) {
printf("%d", a);
}
int main() {
fun(23);
return 0;
}
What is the output of the following code?
#include<stdio.h>
int main() {
auto a;
register r;
static s;
extern e;
typedef t;
printf("\n%d", sizeof a);
printf("\n%d", sizeof r);
printf("\n%d", sizeof s);
printf("\n%d", sizeof e);
printf("\n%d", sizeof(t));
return 0;
}
C interview questions for freshers
What is the output of the following code?
#include<stdio.h>
int main() {
auto a;
register r;
static s;
extern e;
typedef t;
printf("\n%d", sizeof a);
printf("\n%d", sizeof r);
printf("\n%d", sizeof s);
printf("\n%d", sizeof e);
printf("\n%d", sizeof t);
return 0;
}
What is the output of the following code?
#include<stdio.h>
static extern int a = 5;
static int b = 6;
int main() {
printf("\n%d", a);
printf("\n%d", b);
return 0;
}
What is the output of the following code?
#include<stdio.h>
void main() {
float f;
clrscr();
f = balututorial(33);
printf("%f", f);
getch();
}
float balututorial(int x) {
float r = (float) x;
return r;
}
What is the output of the following code?
#include<stdio.h>
void main() {
static int a = 25;
void cdecl conv1();
void pascal conv2();
call1(a);
call2(a);
getch();
}
void cdecl call1(int a, int b) {
printf("%d %d", a, b);
}
void pascal call2(int a, int b) {
printf("\n%d %d", a, b);
}
What is the output of the following code?
#include<stdio.h>
void cdecl fun1(int, int);
void pascal fun2(int, int);
int main() {
int a = 5, b = 5;
fun1(++a, a++);
fun2(b++, ++b);
return 0;
}
void cdecl fun1(int p, int q) {
printf("cdecl: %d %d \n", p, q);
}
void pascal fun2(int p, int q) {
printf("pascal: %d %d", p, q);
}
What is the output of the following code?
#include <stdio.h>
void convention(int, int, int);
int main() {
int a = 5;
convention(a, ++a, a++);
return 0;
}
void convention(int p, int q, int r) {
printf("%d %d %d", p, q, r);
}
What is the output of the following code?
#include <stdio.h>
int balututorial(register int, register int);
int main() {
int temp;
temp = balututorial(5, 25);
printf("%d", temp);
return 0;
}
int balututorial(int register x, int register y) {
static int num;
num = ~x + y + 1;
return num;
}
fresher c interview questions
What is the output of the following code?
#include <stdio.h>
int main() {
funcall(2);
return 0;
}
int funcall(long int p, long int q, long int r) {
printf("%d %d %d", p, q, r);
return 0;
}
What is the output of the following code?
#include <stdio.h>
void funcall(float, float, float);
int main() {
funcall(5.0 f);
return 0;
}
void funcall(float x, float y, float z) {
printf("%f %f %f", x, y, z);
}
What is the output of the following code?
#include <stdio.h>
int main() {
funcall('A');
return 0;
}
int funcall(char x, char y, char z) {
printf("%c %c %c", x, y, z);
return 0;
}
What is the output of the following code?
#include<stdio.h>
int test();
int main() {
for (test(); test(); test()) {
printf("%d ", test());
}
return 0;
}
int test() {
int static num = 7;
return num--;
}
What is the output of the following code?
#include<stdio.h>
int main() {
register a, b, sum;
scanf(“ % d % d”, & a, & b);
sum = a + b;
printf(“ % d”, sum);
return 0;
}
What is the output of the following code?
#include<stdio.h>
int balututorial(int, ...);
int main() {
int x, y;
x = balututorial(2, 4, 6, 8, 10, 12, 14);
y = balututorial(3, 6, 9, 12);
printf("%d %d ", x, y);
return 0;
}
int balututorial(int s, ...) {
void * ptr;
ptr = ...;
(int*) ptr += 2;
s = *(int*)ptr;
return s;
}
C function interview questions
What is the output of the following code?
#include<stdio.h>
int main() {
int x, num = 1;
x = call(num);
printf("%d", x);
return 0;
}
int call(int num) {
static int x = 0;
if (num < 4) {
x = x + num;
call(num + 1);
} else
break;
return x;
}
What is the output of the following code?
#include <stdio.h>
int* function();
int main() {
auto int* x;
int *(*ptr)();
ptr = &function;
x = (*ptr)();
printf("%d", *x);
return 0;
}
int* function() {
static int a = 10;
return &a;
}
What is the output of the following code?
#include <stdio.h>
int find(char);
int(*function ())(char);
int main() {
int x;
int(*ptr)(char);
ptr=function ();
x = (*ptr)('A');
printf("%d", x);
return 0;
}
int find(char c) {
return c;
}
int(*function())(char) {
return find;
}