Write a program that reads a list of test scores and calculate their average. An input of -99 for a score denotes end-of-data for the user

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

1207

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Program:

<span class="com">#include</span><span class="pln"> </span><span class="str">&lt;stdio.h&gt;</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">int</span><span class="pln"> n</span><span class="pun">,</span><span class="pln"> sum</span><span class="pun">,</span><span class="pln"> score</span><span class="pun">;</span><span class="pln">
	</span><span class="kwd">float</span><span class="pln"> average</span><span class="pun">;</span><span class="pln">
	sum </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln">
	n </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln">
	printf</span><span class="pun">(</span><span class="str">"\n Enter a test score(-99 to quit):"</span><span class="pun">);</span><span class="pln">
	scanf</span><span class="pun">(</span><span class="str">"%d"</span><span class="pun">,</span><span class="pln"> </span><span class="pun">&amp;</span><span class="pln">score</span><span class="pun">);</span><span class="pln">
	</span><span class="kwd">while</span><span class="pun">(</span><span class="pln">score </span><span class="pun">!=</span><span class="pln"> </span><span class="pun">-</span><span class="lit">99</span><span class="pun">)</span><span class="pln">
	</span><span class="pun">{</span><span class="pln">
		sum </span><span class="pun">+=</span><span class="pln"> score</span><span class="pun">;</span><span class="pln">
		n</span><span class="pun">++;</span><span class="pln">
		printf</span><span class="pun">(</span><span class="str">"\n Enter a test score(-99 to quit):"</span><span class="pun">);</span><span class="pln">
		scanf</span><span class="pun">(</span><span class="str">"%d"</span><span class="pun">,&amp;</span><span class="pln">score</span><span class="pun">);</span><span class="pln">
	</span><span class="pun">}</span><span class="pln">
	average </span><span class="pun">=</span><span class="pln"> </span><span class="pun">(</span><span class="kwd">float</span><span class="pun">)</span><span class="pln">sum</span><span class="pun">/</span><span class="pln"> n</span><span class="pun">;</span><span class="pln">
	printf</span><span class="pun">(</span><span class="str">"\n The average is %f"</span><span class="pun">,</span><span class="pln"> average</span><span class="pun">);</span><span class="pln">
	
	getch</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>

Output:

 Enter a test score(-99 to quit):12

 Enter a test score(-99 to quit):13

 Enter a test score(-99 to quit):10

 Enter a test score(-99 to quit):20

 Enter a test score(-99 to quit):99

 Enter a test score(-99 to quit):-99

 The average is 30.799999

Explanation:

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