Question

Assume the following variable declaration exists in a program:

double number = 123.456;
What format specifier should be inserted in the statement below to display the value of the number variable rounded to one decimal place, in a field that is 10 spaces wide? (Do not use comma separators.)

printf("_______", number);
A) %10d
B) %1.0f
C) %010.1lf
D) %10.1lf

Please select the correct option.

Answer 1

The correct format specifier to print the double value 123.456 rounded to one decimal place in a 10 character wide field is %10.1lf.

Step-by-step explanation:

To display the value of the variable number rounded to one decimal place, in a field 10 spaces wide using printf, the correct format specifier to use would be %10.1lf.

This specifier ensures that the number is displayed with one digit after the decimal point and is right-aligned within a field width of 10 characters.

It is important to note that double variables should use the lf specifier in printf, whereas d is used for integers, and the f specifier is used for single-precision floating points. Also, the leading zero in the specifier %010.1lf would lead to the number being padded with zeros.