Programming in C MCQ - Constants, Variables and Data Types

46 By default, any real number in 'C' is treated as

The storage size of int is implementation-dependent. C guarantees that int has a minimum representable range, but it does not require int to occupy exactly two bytes. Many modern systems use a four-byte int. The sizeof operator can be used to determine the actual storage size of a type on a particular implementation.

47 To print out a and b given below, which printf() statement would you use?
float a = 3.14;
double b = 3.14;

The printf function displays formatted output according to its format string. The %f conversion specifier prints a floating-point value in fixed-point decimal notation. Escape sequences such as and represent a newline and a horizontal tab. Each conversion specifier must match the corresponding argument type.

48 When a variable of data type double is converted into float, then

Converting a double value to float may cause a loss of precision because float commonly provides fewer significant digits than double. If the original value cannot be represented exactly as float, it is rounded to a representable value. The conversion may also encounter range limitations.

49 The library function sqrt operates on a double precision argument. If, i is an integer variable, then which of the following calls would correctly compute sqrt(i)?

The sqrt function is declared in the math.h header and calculates the square root of its argument. The standard sqrt function accepts a double and returns a double. When an integer argument is supplied, it is converted to double. A call such as sqrt((double)i) explicitly converts the integer variable i before calculating its square root.

50 What is the output of the following C program? #include int main(void) { printf("%f", (float)9 / 5); return 0; }

The expression (float)9/5 first converts the integer 9 into the floating-point value 9.0. Since one operand is floating-point, 5 is also converted to float and floating-point division is performed. Therefore, 9.0/5.0 produces 1.8. The printf format specifier %f displays this value as 1.800000 by default. Hence, option A (1.8) is the intended correct answer.