C Programming Unit-1 Test-2

Which of the following is not a valid C variable name?

• int number;

• float rate;

• int variable_count;

• int $main;

Answer explanation

Since only underscore and no other special character is allowed in a variable name, it results in an error.

Which of the following is true for variable names in C?

• They can contain alphanumeric characters as well as special characters

• It is not an error to declare a variable to be one of the keywords(like goto, static)

• Variable names cannot start with a digit

• Variable can be of any length

What is short int in C programming?

• The basic data type of C

• Qualifier

• Short is the qualifier and int is the basic data type

• All of the mentioned

Which of the following typecasting is accepted by C language?

• Widening conversions

• Narrowing conversions

• Widening & Narrowing conversions

• None of the mentioned

Which of the following is NOT possible with any 2 operators in C?

• Different precedence, same associativity

• Different precedence, different associativity

• Same precedence, different associativity

• All of the mentioned

Property which allows to produce different executable for different platforms in C is called?

• File inclusion

• Selective inclusion

• Conditional compilation

• Recursive macros

What will be the output of the following C code?

int y = 10000;

int y = 34;

printf("Hello World! %d\n", y);

• Hello World! 34

• Hello World! 10000

• Hello World! followed by a junk value

• Compile time error

What will be the output of the following C code?

signed char chr;

chr = 128;

printf("%d\n", chr);

• 128

• -128

• Depends on the compiler

• None

What will be the output of the following C code? (Initial values: x= 7, y = 8)

float x;

int y;

printf("enter two numbers \n", x);

scanf("%f %f", &x, &y);

printf("%f, %d", x, y);

• 7.000000, 8

• Run time error

• 7.000000, junkvalue

• Varies

What is the range of values that can be stored by int datatype in C?

• -(2^31) to (2^31) - 1.

• -256 to 255

• -(2^63) to (2^63)-1

• 0 to (2^31)-1