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Home > C Programming > If statements > Questions and Answers

Exercise:

► Section 1

Section 2

Section 3

01. What is the output of following C code?
main()
{
float me = 1.1;
double you = 1.1;
if(me==you)
printf("I love U");
else
printf("I hate U");
}
A. I hate U B. I love U
C. Compiler error D. None of these

Answer and Explanation

Answer: I hate U

Explanation:
For floating point numbers (float, double, long double) the values cannot be predicted exactly.

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02. What is the output of following C code?
main()
{
static int var = 5;
printf("%d ",var--);
if(var)
main();
}
A. 5 4 3 2 1 B. 4 3 2 1
C. 3 2 1 D. 5 4 3 2
E. 5 4 3 2 1 0

Answer and Explanation

Answer: 5 4 3 2 1

Explanation:
When static storage class is given, it is initialized once. The change in the value of a static variable is retained even between the function calls. Main is also treated like any other ordinary function, which can be called recursively.

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03. What is the output of following C code?
main()
{
int a= 0;int b = 20;char x =1;char y =10;
if(a,b,x,y)
printf("hello");
}
A. 0 B. 10
C. hello D. 1

Answer and Explanation

Answer: hello

Explanation:
The comma operator has associativity from left to right. Only the rightmost value is returned and the other values are evaluated and ignored. Thus the value of last variable y is returned to check in if. Since it is a non zero value if becomes true so, "hello" will be printed.

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04. What is the output of following C code?
#ifdef something
int some=0;
#endif

main()
{
int thing = 0;
printf("%d %d\n", some ,thing);
}
A. 0 0 B. 0
C. null D. Compiler error

Answer and Explanation

Answer: Compiler error

Explanation:
This is a very simple example for conditional compilation. The name something is not already known to the compiler making the declaration int some = 0; effectively removed from the source code.

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05. Which of the following is the boolean operator for logical-and?
A. & B. &&
C. | D. |&

Answer and Explanation

Answer: &&

Explanation:
There is no explanation...

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06. Evaluate !(1 && !(0 || 1)).
A. True B. False
C. Compile Error D. Cannot be determined

Answer and Explanation

Answer: True

Explanation:
There is no explanation...

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07. Which of the following shows the correct syntax for an if statement?
A. if expression B. if { expression
C. if ( expression ) D. expression if

Answer and Explanation

Answer: if ( expression )

Explanation:
There is no explanation...

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08. The statement that tests to see if sum is equal to 10 and total is less than 20, and if so, prints the text string "incorrect.", is
A. Statement 1
if( (sum = 10) && (total < 20) )
printf("incorrect.");
 B. Statement 2
if( (sum == 10) && (total < 20) )
printf("incorrect.");
C. Statement 3
if( (sum == 10) || (total < 20) )
printf("incorrect.");
 D. Cannot be determined

Answer and Explanation

Answer: Statement 2
if( (sum == 10) && (total < 20) )
printf("incorrect.");

Explanation:
There is no explanation...

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09. If flag is 1 or letter is not an 'X', then assign the value 0 to exit_flag, else set exit_flag to 1.
A. Statement 1
if( (flag = 1) || (letter != 'X') )
exit_flag = 0;
else
exit_flag = 1;
 B. Statement 2
if( (flag == 1) || (letter <> 'X') )
exit_flag = 0;
else
exit_flag = 1;
C. Statement 3
if( (flag == 1) || (letter != 'X') )
exit_flag = 0;
else
exit_flag = 1;
 D. Cannot be determined

Answer and Explanation

Answer: Statement 3
if( (flag == 1) || (letter != 'X') )
exit_flag = 0;
else
exit_flag = 1;

Explanation:
There is no explanation...

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10. The statement that compares the value of an integer called sum against the value 65, and if it is less, prints the text string "Sorry, try again", is
A. Statement 1
if( sum < "65" )
printf("Sorry, try again" );
 B. Statement 2
if( sum <= 65 )
printf("Sorry, try again" );
C. Statement 3
if( 65 == sum )
printf("Sorry, try again" );
 D. Statement 4
if( sum < 65 )
printf("Sorry, try again" );

Answer and Explanation

Answer: Statement 4
if( sum < 65 )
printf("Sorry, try again" );

Explanation:
There is no explanation...

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