C Programming Online Quiz
Following quiz provides Multiple Choice Questions (MCQs) related to C Programming Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.
Q 1 - What is the output of the following code snippet?
#include<stdio.h>
main()
{
char c = 'A'+255;
printf("%c", c);
}
Answer : A
Explanation
A, the range of ASCII values for the ASCII characters is 0-255. Hence the addition operation circulates back to ‘A’
Q 2 - What is the output of the following program?
#include<stdio.h>
void f()
{
printf(“Hello\n”);
}
main()
{
;
}
B - Error, as the function is not called.
C - Error, as the function is defined without its declaration
Answer : A
Explanation
No output, apart from the option (a) rest of the comments against the options are invalid.
Q 3 - A single line comment in C language source code can begin with _____
Answer : D
Explanation
Two immediate forward slashes are used to comment a single line. A single can be commented by beginning with /* and should be terminated with */ , in general used for multi-line comments.
Q 4 - What is the output of the following program?
#include<stdio.h>
main()
{
char *p = NULL;
printf("%c", *p);
}
Answer : D
Explanation
It is invalid to access the NULL address hence giving run time error.
Q 5 - A local variable is stored in ___
Answer : B
Explanation
All the local variables are stored in a memory called as stack.
Q 6 - Which header statement is missing in the given below program to get the desired output?
#include<stdio.h>
#include<math.h>
int main ()
{
double x = 1234321;
double result = sqrt(x);
printf("The square root of %.2lf is %.2lf\n", x, result);
return 0;
}
D - Above program is absolutely correct to give desired result
Answer : B
Explanation
In C programming, math.h is a header file in the standard library designed for basic mathematical operations.
Output of above code: The square root of 1234321.00 is 1111.00
#include<stdio.h>
#include<math.h>
int main ()
{
double x = 1234321;
double result = sqrt(x);
printf("The square root of %.2lf is %.2lf\n", x, result);
return 0;
}
Q 7 - What function can be used to free the memory allocated by calloc()?
Answer : C
Explanation
calloc(): Allocates space for an array elements, initializes to zero and then returns a pointer to memory.
Free(): Dellocate the space allocated by calloc()
Q 8 - In the given below code, the P2 is
Typedef int *ptr; ptr p1, p2;
Answer : B
Explanation
Ptr is an alias to int*.
Q 9 - What will be the output of the given below program in TurboC
#include<stdio.h>
int fun(int **ptr);
int main()
{
int i = 10, j = 20;
const int *ptr = &i;
printf(" i = %5X", ptr);
printf(" ptr = %d", *ptr);
ptr = &j;
printf(" j = %5X", ptr);
printf(" ptr = %d", *ptr);
return 0;
}
A - i= FFE6 ptr=30 j=FFE4 ptr=36
B - i= FFE0 ptr=04 j=FFE1 ptr=30
Answer : C
Explanation
First the pointer holds I’s address and changes later to hold j’s address. Hence printing the 10 & 20 respectively.
#include<stdio.h>
int fun(int **ptr);
int main()
{
int i = 10, j = 20;
const int *ptr = &i;
printf(" i = %5X", ptr);
printf(" ptr = %d", *ptr);
ptr = &j;
printf(" j = %5X", ptr);
printf(" ptr = %d", *ptr);
return 0;
}
Q 10 - What will be the output of the given below code?
#include<stdio.h>
int main()
{
const int *ptr = &i;
char str[] = "Welcome";
s = str;
while(*s)
printf("%c", *s++);
return 0;
}
Answer : A
Explanation
Although, char str[] = "Welcome"; and s = str;, the program will print the value of s.
#include<stdio.h>
int main()
{
const int *ptr = &i;
char str[] = "Welcome";
s = str;
while(*s)
printf("%c", *s++);
return 0;
}
