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<h1 itemprop="name"><a href="http://stackoverflow.com/questions/42318707/c-nested-loop-for-interest" class="question-hyperlink">C Nested Loop for Interest</a></h1>
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<p>My C program has to contain a loop that increases the interest rate, and a nested loop that calculates the interest and displays a total per each interest rate. Can anyone point me in the right direction?</p>
<p>The program should output 10 interest rates and the corresponding total interest plus the loan</p>
<p>The interest rate starts .01 (1 percent) and should end at .10 (10 percent).</p>
<pre class="code c_cpp prettyprint prettyprinted">
#include <stdio.h>
int main(void)
{
double loan = 1000.00, rate = 0.01, output;
int year = 1;
do {
rate + 0.01;
for (year = 1; year < 11; year++) {
output = rate * loan + loan;
}
printf("%d $%d\n", year, output);
} while (year < 11);
return 0;
}</pre>
<!-- <pre class="code c_cpp lang-c prettyprint prettyprinted"><code><span class="com">#include</span><span class="pln"> </span><span class="str"><stdio.h></span><span class="pln">
</span><span class="typ">int</span><span class="pln"> main</span><span class="pun">(</span><span class="kwd">void</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"> loan </span><span class="pun">=</span><span class="pln"> </span><span class="lit">1000.00</span><span class="pun">,</span><span class="pln"> rate </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0.01</span><span class="pun">,</span><span class="pln"> output</span><span class="pun">;</span><span class="pln">
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output </span><span class="pun">=</span><span class="pln"> rate </span><span class="pun">*</span><span class="pln"> loan </span><span class="pun">+</span><span class="pln"> loan</span><span class="pun">;</span><span class="pln">
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printf</span><span class="pun">(</span><span class="str">"%d $%d\n"</span><span class="pun">,</span><span class="pln"> year</span><span class="pun">,</span><span class="pln"> output</span><span class="pun">);</span><span class="pln">
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</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></code></pre> -->
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asked <span title="2017-02-18 17:57:56Z" class="relativetime">1 hour ago</span>
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<span class="comment-copy"><code>rate + 0.01</code> does nothing useful</span>
– <a href="http://stackoverflow.com/users/6451573/jean-fran%c3%a7ois-fabre" title="36,076 reputation" class="comment-user">Jean-François Fabre</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="http://stackoverflow.com/questions/42318707/c-nested-loop-for-interest#comment71790840_42318707"><span title="2017-02-18 18:04:16Z" class="relativetime-clean">1 hour ago</span></a></span>
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<span class="comment-copy">Does the user have to input anything or not ? I am not finding it clear to understand what you actually want the program to do. What should the output look like ?</span>
– <a href="http://stackoverflow.com/users/7468879/rizzo" title="409 reputation" class="comment-user">Rizzo</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="http://stackoverflow.com/questions/42318707/c-nested-loop-for-interest#comment71790844_42318707"><span title="2017-02-18 18:04:22Z" class="relativetime-clean">1 hour ago</span></a></span>
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<span class="comment-copy">The user does not input anything. The program should output a table display the rate and what the interest is at that rate. So it should out 10 rows of interest and the corresponding total at that interest rate</span>
– <a href="http://stackoverflow.com/users/7282656/dreed" title="11 reputation" class="comment-user owner">dreed</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="http://stackoverflow.com/questions/42318707/c-nested-loop-for-interest#comment71791088_42318707"><span title="2017-02-18 18:15:52Z" class="relativetime-clean">1 hour ago</span></a></span>
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<span class="comment-copy">Ok, for starters, the <code>printf</code> statement should be inside the for loop. Also, check out the good answer by @Schwern</span>
– <a href="http://stackoverflow.com/users/7468879/rizzo" title="409 reputation" class="comment-user">Rizzo</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="http://stackoverflow.com/questions/42318707/c-nested-loop-for-interest#comment71791273_42318707"><span title="2017-02-18 18:26:36Z" class="relativetime-clean">1 hour ago</span></a></span>
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<p>First things first, turn on warnings. C compilers normally don't give you warnings, it's generally <code>-Wall</code> to get the basics (not all). Once we do that...</p>
<pre class="lang-c prettyprint prettyprinted"><code><span class="pln">test</span><span class="pun">.</span><span class="pln">c</span><span class="pun">:</span><span class="lit">17</span><span class="pun">:</span><span class="lit">36</span><span class="pun">:</span><span class="pln"> warning</span><span class="pun">:</span><span class="pln"> format specifies type </span><span class="str">'int'</span><span class="pln"> but the argument has type </span><span class="str">'double'</span><span class="pln"> </span><span class="pun">[-</span><span class="typ">Wformat</span><span class="pun">]</span><span class="pln">
printf</span><span class="pun">(</span><span class="str">"%d $%d\n"</span><span class="pun">,</span><span class="pln"> year</span><span class="pun">,</span><span class="pln"> output</span><span class="pun">);</span><span class="pln">
</span><span class="pun">~~</span><span class="pln"> </span><span class="pun">^~~~~~</span><span class="pln">
</span><span class="pun">%</span><span class="pln">f</span></code></pre>
<p>That tells us you're passing a floating point number to <code>printf</code> but trying to treat it as an integer, so it's going to be translated to a string incorrectly. It needs to be.</p>
<pre class="lang-c prettyprint prettyprinted"><code><span class="pln"> printf</span><span class="pun">(</span><span class="str">"%d $%.2f\n"</span><span class="pun">,</span><span class="pln"> year</span><span class="pun">,</span><span class="pln"> output</span><span class="pun">);</span></code></pre>
<p><code>%f</code> for a floating point number, and the <code>.2</code> means to only use two decimal places like money.</p>
<hr>
<pre class="lang-c prettyprint prettyprinted"><code><span class="pln">test</span><span class="pun">.</span><span class="pln">c</span><span class="pun">:</span><span class="lit">9</span><span class="pun">:</span><span class="lit">14</span><span class="pun">:</span><span class="pln"> warning</span><span class="pun">:</span><span class="pln"> expression result unused </span><span class="pun">[-</span><span class="typ">Wunused</span><span class="pun">-</span><span class="pln">value</span><span class="pun">]</span><span class="pln">
rate </span><span class="pun">+</span><span class="pln"> </span><span class="lit">0.01</span><span class="pun">;</span><span class="pln">
</span><span class="pun">~~~~</span><span class="pln"> </span><span class="pun">^</span><span class="pln"> </span><span class="pun">~~~~</span><span class="pln">
</span><span class="lit">2</span><span class="pln"> warnings generated</span><span class="pun">.</span></code></pre>
<p>This one tells us that the <code>rate</code> is never incremented. It's added to, but never stored anywhere. Instead you want <code>rate += 0.01</code>.</p>
<hr>
<p>Now it runs. Once. And it only reports on year 11.</p>
<p>The problem is your outer do/while loop is using <code>year</code>, but the <code>for</code> loop will end with the year at the threshhold, so it will immediately stop. Instead of using a do/while loop, which is rarely necessary, use another for loop.</p>
<p>Second problem is you're printing the output and year outside the <code>year</code> <code>for</code> loop. So you'll only ever get the result for the last year. If you want all the years, the print goes inside.</p>
<pre class="lang-c c_cpp code prettyprint prettyprinted">
#include <stdio.h>
int main(void)
{
const double initial_loan = 1000.00;
for( double rate = 0.01; rate <= 0.10; rate += 0.01 ) {
double loan = initial_loan;
for (int year = 1; year <= 10; year++) {
loan += rate*loan;
printf("%d @ %.2f%% $%.2f\n", year, rate * 100, loan);
}
}
return 0;
}
</pre>
<!-- <pre class="lang-c prettyprint prettyprinted"><code><span class="com">#include</span><span class="pln"> </span><span class="str"><stdio.h></span><span class="pln">
</span><span class="typ">int</span><span class="pln"> main</span><span class="pun">(</span><span class="kwd">void</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
</span><span class="kwd">const</span><span class="pln"> </span><span class="kwd">double</span><span class="pln"> initial_loan </span><span class="pun">=</span><span class="pln"> </span><span class="lit">1000.00</span><span class="pun">;</span><span class="pln">
</span><span class="kwd">for</span><span class="pun">(</span><span class="pln"> </span><span class="kwd">double</span><span class="pln"> rate </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0.01</span><span class="pun">;</span><span class="pln"> rate </span><span class="pun"><=</span><span class="pln"> </span><span class="lit">0.10</span><span class="pun">;</span><span class="pln"> rate </span><span class="pun">+=</span><span class="pln"> </span><span class="lit">0.01</span><span class="pln"> </span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
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</span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="typ">int</span><span class="pln"> year </span><span class="pun">=</span><span class="pln"> </span><span class="lit">1</span><span class="pun">;</span><span class="pln"> year </span><span class="pun"><=</span><span class="pln"> </span><span class="lit">10</span><span class="pun">;</span><span class="pln"> year</span><span class="pun">++)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
loan </span><span class="pun">+=</span><span class="pln"> rate</span><span class="pun">*</span><span class="pln">loan</span><span class="pun">;</span><span class="pln">
printf</span><span class="pun">(</span><span class="str">"%d @ %.2f%% $%.2f\n"</span><span class="pun">,</span><span class="pln"> year</span><span class="pun">,</span><span class="pln"> rate </span><span class="pun">*</span><span class="pln"> </span><span class="lit">100</span><span class="pun">,</span><span class="pln"> loan</span><span class="pun">);</span><span class="pln">
</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></code></pre> -->
<p>Notice that I declare variables in the narrowest possible scope. This tells you when they're appropriate to be used, and avoids goofs like trying to use the <code>year</code> in the outer loop.</p>
<p>A lot of C material will be extremely conservative and tell you to declare all variables at the start of a function. This isn't necessary, and hasn't been for a long, long time. Though declaring variables in a <code>for</code> loop is a C99 thing, that part of C99 is very well supported.</p>
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<span class="comment-copy">Thanks, you explained everything clearly. I had written this program multiple ways but I think my main error was passing the float as int when trying to use printf.</span>
– <a href="http://stackoverflow.com/users/7282656/dreed" title="11 reputation" class="comment-user owner">dreed</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="http://stackoverflow.com/questions/42318707/c-nested-loop-for-interest#comment71791861_42318988"><span title="2017-02-18 18:56:48Z" class="relativetime-clean">41 mins ago</span></a></span>
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