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()
{
int x = 5;
if(x=5)
{
if(x=5) break;
printf("Hello");
}
printf("Hi");
}
Answer : A
Explanation
compile error, keyword break can appear only within loop/switch statement.
Q 2 - What is the output of the following program?
#include<stdio.h>
main()
{
int x = 1;
do
printf("%d ", x);
while(x++<=1);
}
Answer : B
Explanation
1 2, do..while is an entry control loop. As the expression x++ is post form loop continues for 2nd time also.
Q 3 - Function fopen() with the mode "r+" tries to open the file for __
Answer : A
Explanation
Option (a), the file should exist and opens for both reading & writing.
Answer : B
Explanation
There is no such data type called ‘string’ in C language.
Q 5 - What is the output of the following program?
#include<stdio.h>
main()
{
char *s = "Abc";
while(*s)
printf("%c", *s++);
}
Answer : A
Explanation
Loop continues until *s not equal to ‘\0’, hence printing “Abc” where character is fetched first and address is incremented later.
Q 6 - In normalized form, if the binary equivalent of 5.375 is “0100 0000 1010 1100 0000 0000 0000 0000” then what will be the output of the program in Intel core machine?
#include<stdio.h>
#include<math.h>
int main ()
{
float a = 5.375;
char *p;
int i;
p = (char*)&a;
for(i=0; i <= 3; i++)
printf("%02x\n", (unsigned char)p[i]);
return 0;
}
Answer : B
Explanation
Depends upon the machine whether its big endian or small endian machine. Byte by byte is fetched from right end.
#include<stdio.h>
#include<math.h>
int main ()
{
float a = 5.375;
char *p;
int i;
p = (char*)&a;
for(i=0; i <= 3; i++)
printf("%02x\n", (unsigned char)p[i]);
return 0;
}
Q 7 - Which header file supports the functions - malloc() and calloc()?
Answer : A
Explanation
void *malloc(size_t size) : Allocates the requested memory and returns a pointer to it.
void *calloc(size_t nitems, size_t size): Allocates the requested memory and returns a pointer to it.
Q 8 - fgets() function is safer than gets() because in fgets() function you can specify the size of the buffer into which the supplied string will be stored.
Answer : A
Explanation
Both functions retrive and store a string from console or file, but fgets() functions are more safer to use then gets() because gets() doesn't facilitate to detail the length of the buffer to store the string in and fgets() facilitates to specify a maximum string length.
char *fgets(char *s, int size, FILE *stream); char *gets(char *s);
Q 9 - To print a float value which format specifier can be used?
Answer : A
Explanation
%f can be use to print out float value and %lf can be use to print out double value.
Q 10 - In the given below code, what will be the value of a variable x?
#include<stdio.h>
int main()
{
int y = 100;
const int x = y;
printf("%d\n", x);
return 0;
}
Answer : A
Explanation
Although, integer y = 100; and constant integer x is equal to y. here in the given above program we have to print the x value, so that it will be 100.
