Write a program that illustrates the run time field width and precision adjustment while using printf( ).

C Programming Language Loop control in C Language (Article) Loop control in C Language (Program)

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Program:

<span class="com">/*
 Program:  Write a program that illustrates the run time field width and
  precision adjustment while using printf( ).  
  
 Author: www.atnyla.com  
 
*/</span><span class="pln"> 

</span><span class="com">#include</span><span class="pln"> </span><span class="str">"stdio.h"</span><span class="pln"> 
</span><span class="kwd">int</span><span class="pln"> main</span><span class="pun">()</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
  </span><span class="kwd">double</span><span class="pln"> x</span><span class="pun">=</span><span class="lit">1234.567890</span><span class="pun">;</span><span class="pln">
  </span><span class="kwd">int</span><span class="pln"> i</span><span class="pun">=</span><span class="lit">8</span><span class="pun">,</span><span class="pln">j</span><span class="pun">=</span><span class="lit">2</span><span class="pun">;</span><span class="pln">

  </span><span class="kwd">while</span><span class="pun">(</span><span class="pln">i</span><span class="pun">&lt;</span><span class="lit">12</span><span class="pun">)</span><span class="pln">
  </span><span class="pun">{</span><span class="pln">
   j</span><span class="pun">=</span><span class="lit">2</span><span class="pun">;</span><span class="pln">
   </span><span class="kwd">while</span><span class="pun">(</span><span class="pln">j</span><span class="pun">&lt;</span><span class="lit">5</span><span class="pun">)</span><span class="pln">
   </span><span class="pun">{</span><span class="pln">
     printf</span><span class="pun">(</span><span class="str">"width = %2d precision = %d display &gt;&gt;%*.*lf&lt;&lt;\n"</span><span class="pun">,</span><span class="pln">i</span><span class="pun">,</span><span class="pln">j</span><span class="pun">,</span><span class="pln">i</span><span class="pun">,</span><span class="pln">j</span><span class="pun">,</span><span class="pln">x</span><span class="pun">);</span><span class="pln">
     j</span><span class="pun">++;</span><span class="pln">
   </span><span class="pun">}</span><span class="pln">
   
   i</span><span class="pun">++;</span><span class="pln">
   </span><span class="pun">}</span><span class="pln">
  </span><span class="kwd">return</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span>

Output:

width =  8 precision = 2 display >> 1234.57<<
width =  8 precision = 3 display >>1234.568<<
width =  8 precision = 4 display >>1234.5679<<
width =  9 precision = 2 display >>  1234.57<<
width =  9 precision = 3 display >> 1234.568<<
width =  9 precision = 4 display >>1234.5679<<
width = 10 precision = 2 display >>   1234.57<<
width = 10 precision = 3 display >>  1234.568<<
width = 10 precision = 4 display >> 1234.5679<<
width = 11 precision = 2 display >>    1234.57<<
width = 11 precision = 3 display >>   1234.568<<
width = 11 precision = 4 display >>  1234.5679<<
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Explanation:

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