Formatted Input and Output in C

What will be the output of the above code if a=123456789245?

• 123456789245

• Compilation error

• 1234567892

• No output

Answer explanation

Using %10d in scanf restricts input to a maximum of 10 digits.

The syntax of printf() function is printf(“control string”, variable list) ;

what is the prototype of the control string?

• %[flags][.precision][width][length]specifier

• %[flags][length][width][.precision]specifier

• %[flags][width][.precision][length]specifier

• %[flags][.precision][length][width]specifier

Answer explanation

The prototype of control string is %[flags][width][.precision][length]specifier. Each control string must begin with % sign

What will be the output of the following C code?

char str[] =”Too Good”;

printf(“\n %7s”,str);

• Too Good

• Too G

• Too Go

• Too

Answer explanation

The complete string “Too Good” is printed. This is because if data needs more space than specified, then printf overrides the width specified by the user.

What will be the output of the following C code?

printf(“\n Output: %5d \t %x \t %#x”, 234,234,234);

• Output:

  234EA0xEA

• Output:

  00234 EA 0xEA

• Output:

  234 EA 0xEA

• ERROR

Answer explanation

The control character \t is used to provide gap between the words. %5d – the width of the string is set to 5, characters are printed after being padded with blank spaces.%x, %#x is additional specifiers for octal and hexadecimal values.

Select the right explanation to the given code.

printf(“%*. *f”, 5,4,5700);

• the minimum field width has to be 4, the precision is given to be 5, and the value to be displayed is 5700

• the minimum field width is 5, the precision is 4, and the value to be displayed is 5700

• compile error

• run-time error

Answer explanation

The minimum field width and precision specifiers are usually constants. They can also be provided by arguments to printf(). This is done by using * modifier as shown in the given code.

What will be the output for the given code ?

printf (“\n The number is %07d”,1212);

• The number is 0001212

• The number is 1212

• The number is 1212

• The number is 1212000

Answer explanation

0 in the above code is Flags. The number is left-padded with zeros(0) instead of spaces.

What happens when zero flag is used with left justification?

• data is padded with zeros

• zero flag is ignored

• data is padded with blank spaces

• will give error

Answer explanation

Zero flag is not considered when used with left justification because adding zeros after a number changes its value.

What symbol is used to Left-justify within the data given field width?

• -(minus sign)

• +(plus sign)

• #

• 0

Answer explanation

To left-justify the data use minus sign(-) in the flags field.

A conversion specification %7.4f means ____________

• print a floating point value of maximum 7 digits where 4 digits are allotted for the digits after the decimal point

• print a floating point value of maximum 4 digits where 7digits are allotted for the digits after the decimal point

• print a floating point value of maximum 7 digits

• print a floating point value of minimum 7 digits where 4 digits are allotted for the digits after the decimal point

Answer explanation

The conversion specification %7.4f means that it will print floating point number maximum of 7 digits and 4 digits after the decimal point.

Choose the correct description for control string %-+7.2f.

• – means display the sign, + means left justify, 7 specifies the width and 2 specifies the precision

• – means left justify, + means display the sign, 7 specifies the width and 2 specifies the precision

• – means display the sign, + means left justify, 7 specifies the precision and 2 specifies the width

• – means left justify, + means display the sign, 7 specifies the precision and 2 specifies the width

Answer explanation

The given control string %-+7.2f means that – is for left justify, + to display sign, 7 specifies the precision and 2 specifies the width.