Module: (C++) Variables. Output formats


Problem

5/7

Output Width and Accuracy

Theory Click to read/hide

Advanced Material
Additional output specifiers allow you to control the output of numbers in certain formats.


Minimum field width
For example:
%04d  - the number will be outputed in 4 positions, if the numbers are less than four, then the first will be zeros
  
int a=34; printf("%04d\n",a); //on the screen: 0 0 3 4   

The underscore is specially designed to visually display the output of the number.

%4d – same, only spaces instead of zeros 
int a=34; printf("%4d\n",a); // on the screen: _ _ 3 4

Conclusion with a certain accuracy - used to output real numbers. By default, real numbers are displayed with an accuracy of 6 decimal places. But there are cases that need to be deduced with a different accuracy. In this case, it is necessary to indicate how much familiarity to allocate for the number itself and how much after the decimal point.

For example
%9.3f   - the real number will be displayed in 9 positions, with three decimal places.
  
double a=34.24356; 
printf("%9.3f\n",a); // on the screen: _ _ _ 3 2 . 2 4 4
 
Now, let's try it. 

Problem

This is an optional task for those who want to learn more about the C-output operator.

In the sixth line, write an operator that outputs the value of the a-variable in a field 10 characters wide, filled with zeros on the left (right justification)

time 1000 ms
memory 32 Mb
Rules for program design and list of errors in automatic problem checking

Teacher commentary

Insert the missing code snippets
C++
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#include <iostream>
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using namespace std;
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int main()
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{
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    int number = 10;
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    return 0;
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}

     

Program check result

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