Re: Re: C program that estimates the value of the math constant e

[GWILouisaxwzkla]

cout and cin are input and output members of a stream object in the file iostream.h . This header file is associated with c++ programs and the method that most c++ programmers use for input and output. cout stands for “console output” and cin stands for console input. You can use them more easily than printf and scanf :

<br /> <br /> int i = 1;<br /> char c = 'd';<br /> .....<br /> <br /> cout &lt;&lt; &quot;the int is: &quot; &lt;&lt; i &lt;&lt; endl; //output : the int is: 1<br /> cout &lt;&lt; &quot;the char is&quot; &lt;&lt; c &lt;&lt; endl; // output : the char is d<br /> <br />

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<br /> <br /> int i = 1;<br /> char c = 'd';<br /> .....<br /> <br /> cout &lt;&lt; &quot;the int is: &quot; &lt;&lt; i &lt;&lt; endl; //output : the int is: 1<br /> cout &lt;&lt; &quot;the char is&quot; &lt;&lt; c &lt;&lt; endl; // output : the char is d<br /> <br />

for the program , try:

<br /> <br /> /****************************************************************<br /> * File Name : c:programstempCG.cpp<br /> * Date : December,15,2008<br /> * Comments : new project<br /> * Compiler/Assembler :<br /> * Modifications :<br /> *<br /> *<br /> *<br /> *<br /> *<br /> * Program Shell Generated At: 3:08:27 p.m.<br /> =-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/<br /> <br /> <br /> #include <br /> //#include <br /> //#include <br /> #include <br /> //#include <br /> //#include <br /> <br /> using namespace std;<br /> <br /> //main function ******************************<br /> <br /> int main ( )<br /> {<br /> <br /> int terms;<br /> double powerOfX;<br /> double e = 1;<br /> double i = 1;<br /> double j ;<br /> double k = 2;<br /> <br /> <br /> printf ( "Enter the number of terms ( greater or equal to one ) : " );<br /> scanf ( "%i" , &amp; terms );<br /> <br /> while ( terms &gt; 1 )<br /> {<br /> e = e + ( 1 / i ) ;<br /> terms --;<br /> i = i * k;<br /> k ++;<br /> <br /> }<br /> printf ( "The approximated value of e : %.12lf n" , e );<br /> printf ( "The given mathematical constant e = 2.718281828459 n");<br /> printf ( "The absolute difference between the two value : " );<br /> printf ( "%.12lf n" , fabs ( 2.718281828459 - e ) );<br /> return 0 ;<br /> }<br /> <br /> <br /> <br />

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<br /> <br /> /****************************************************************<br /> * File Name : c:programstempCG.cpp<br /> * Date : December,15,2008<br /> * Comments : new project<br /> * Compiler/Assembler :<br /> * Modifications :<br /> *<br /> *<br /> *<br /> *<br /> *<br /> * Program Shell Generated At: 3:08:27 p.m.<br /> =-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/<br /> <br /> <br /> #include <br /> //#include <br /> //#include <br /> #include <br /> //#include <br /> //#include <br /> <br /> using namespace std;<br /> <br /> //main function ******************************<br /> <br /> int main ( )<br /> {<br /> <br /> int terms;<br /> double powerOfX;<br /> double e = 1;<br /> double i = 1;<br /> double j ;<br /> double k = 2;<br /> <br /> <br /> printf ( "Enter the number of terms ( greater or equal to one  ) : " );<br /> scanf ( "%i" , &amp; terms );<br /> <br /> while ( terms &gt; 1 )<br /> {<br /> e = e +  ( 1 / i ) ;<br /> terms --;<br /> i = i * k;<br /> k ++;<br /> <br /> }<br /> printf ( "The approximated value of e : %.12lf n" , e );<br /> printf ( "The given mathematical constant e = 2.718281828459 n");<br /> printf ( "The absolute difference between the two value : " );<br /> printf ( "%.12lf n" , fabs (  2.718281828459 - e ) );<br /> return 0 ;<br /> }<br /> <br /> <br /> <br />