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Programming in C MCQ - I/O Operations

21 The following program
main()
{
printf ("tim");
main( ) ;
}

This involves recursion - main ( ) calling itself. So, it keeps on printing tim.

22 Consider the following program.
main()
{
putchar ( 'M' );
first();
putchar ( 'm');
}
first ( )
{ _____ }
second ( )
{
putchar ( 'd');
}
If Madam is the required output, then the body of first ( ) must be

Since madam is the required output. the function first( ) should print ' a ' call the function second ( ) that prints the 'd' and print ' a ' again. Hence c is the correct answer.

23 The following program
main()
{
int i = 2;
{ int i = 4, j = 5;
printf ("%d%d", i, j );
}
printf("%d%d", i, j );
}

This will not compile successfully. The scope of the variable ' j ' is the single printf statement that follows it.
So. the last statement that involves ' j ' will complain about the undeclared identifier ' j '

24 printf("ab", "cd", "ef");
prints

25 main( )
(
int a = 5, b = 2;
printf("%d", a+++b);
}

The compiler will tokenize a + + + b as a, + +, b. So, a + + b is equivalent to a + + + b, which evaluates to 7

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Question:

The following statement printf( ‘%f ’, 9/5) ; prints

A. 1.8
B. 1.0
C. 2.0
D. 0.00

Correct answer: D

Explanation:

This statement is undefined behavior because the argument has to be of type double and 9 / 5 is of type int. Following program yields an output of…

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