C Language Quiz
1) The correct order of compilation of a C program is
i) Compile source code to object code
ii) Link object code and libraries
iii) Create binary or executable file
iv) Process Preprocessor directives
A) i → ii → iii → iv
B) iv → i → ii → iii
C) i → iv → ii → iii
Answer: Preprocessor directives are processed first, followed by compilation, linking and binary file
creation.
2) Which of the following data type can be used for storing a floating point constant?
A) long int
B) double
C) unsigned char
Answer: float & double data types can be used for storing floating point constants in C
3) What is the result of running the following code snippet?
float result;
result = 5/2;
printf("%.1f",result);
A) 2.0
B) 2.5
C) 0
Answer: Division of two integer constants results in an integer in C. So 5/2 becomes 2. As the output is
printed in %.1f format, it is printed as 2.
4) What is the result of running the following code snippet
if(0)
printf("The Sun rises in the East");
else
printf("The Sun rises in the West");
A) The Sun rises in the East
B) The Sun rises in the West
C) Compilation Error
Answer: Non-zero is considered true and zero is false in C. So the statement in else is printed
5) What is the value of variable ‘i’ after running the following statements?
int i = 10;
i = i / 2;
i = i % 2;
A) 0
B) 1
C) 2
Answer: 10/2 is 5. 5%2 is 1. % is modular division operator
6) The purpose of the function int toupper (int c) as defined in ctype.h is to
A) Convert the input string stored in variable c to upper case
B) Convert the input character stored in variable c to upper case
C) None of the above
Answer: toupper converts input character to upper case. Even none of the above is awarded marks as
there is ambiguity in answers A, B. The answers were meant to mean “Convert the input character
stored in variable c to upper case.” The answers give a wrong meaning like “Convert the input character
‘c’ to upper case. Like ‘c’ to ‘C’ ”.
7) The difference between the user defined constants ‘Z’ and “Z” is
A) ‘Z’ is a string constant whereas “Z” is a character constant
B) ‘Z’ is a character constant whereas “Z” is a string constant
C) There is no difference
Answer: Character constants are enclosed within single inverted comma or apostrophe ‘. Whereas,
strings in C are enclosed within double inverted commas “.
8) Output of running the following code snippet is
int i;
for ( i = 0; i < 3; i++ )
{
if(i == 2)
{
printf("%d\t",i);
}
}
A) 0 1 2 3
B) 0 1 2
C) 2
9) The conversion character for printing an integer in hexadecimal number using printf is
A) %x
B) %d
C) %o
10) Output of following code snippet
float marks[10] = {53,66,36,36,53,23,64,12,53,88};
float *marksPtr = marks;
marksPtr = marksPtr + 4;
printf("%.0f", *marksPtr);
A) 0
B) 53
C) 36
D) Garbage value
Answer: marksPtr + 4 points to the 5th element in array. Therefore 53
11) Which of the following is the correct way to allocate space for an array of 15 float variables?
A) float *floatArray = (float *) malloc ( 15 );
B) float floatArray = (float *) malloc ( 15 );
C) float *floatArray = (float *) malloc ( 15 * sizeof(float) );
D) float *floatArray = 15 * malloc (sizeof(float) );
Answer: This is syntax of malloc
12) The following C statement causes an infinite loop (true/false):
while (1);
A) true
B) false
Answer: 1 is true. So while gets stuck in an infinite loop
13) Output of the following code snippet is:
int array[] = {1,2,3,4,5};
printf("%d", array[5]);
A) 0
B) 4
C) 5
D) Garbage value
Answer: array[5] refer to 6th element in the array. Hence garbage value
14) Output of following statement is:
#define NUM 5
int main()
{
NUM++;
printf("%d", NUM);
return 0;
}
A) 5
B) 6
C) Compilation error
Answer: NUM is a symbolic constant. A constant’s value can’t be modified
15) Output of the following statement is
int i = 5;
if(i = 5)
{
puts("Structured programming language");
}
else
{
puts("Object oriented programming language");
}
A) Structured programming language
B) Object oriented programming language
C) Compilation error
Answer: i=5 is an assignment, not a comparison. Hence the statement becomes if(5) and hence prints
statement in if block
16) Which of the following is a true statement?
A) Strings in C are char arrays terminated by ‘\0’
B) Strings in C are char arrays terminated by NULL
C) Strings in C are char arrays terminated by EOF
17) Which of the following is a NOT a true statement?
A) The base address of an array is same as the name of the array
B) The base address of an array is address of the first element in the array
C) The base address of a static array can be modified
18) Which of the following is true about break statement in C?
A) break statement exits out of the innermost loop nested around it
B) break statement exits out of all the outer loops nested around it
C) break statement skips one iteration and continues looping
Answer:
Consider a loop
for(i=0; i<5;i ++)
for(j=0;j<6;j++)
break;
break statement exits out of the inner most loop nested around it.
19) Output of the following program is:
int main()
{
int i =0;
modify(i);
printf("%d", i );
return 0;
}
int modify(int z)
{
return (++z);
}
A) 0
B) 1
Answer: A copy of i is sent to the function modify, hence changes to that copy are not reflected in i. Call
by value concept
20) Point out at least two errors in the following code snippet
float a;
scanf("Enter number: %f", a );
Answer:
1. String “Enter number” can’t be entered in scanf format string
2. & is missing for a. it should have been scanf("%f", & a );
3. Semicolon missing at the end of the statemen
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