Write a program for printing prime numbers between 1 and 100.

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

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If you don't know what is prime number please read form this tutorial. Prime Number & Prime Factors

Program:

<span class="com">#include</span><span class="pln"> </span><span class="str">&lt;stdio.h&gt;</span><span class="pln">
</span><span class="com">#include</span><span class="pln"> </span><span class="str">&lt;math.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"> i</span><span class="pun">,</span><span class="pln"> j</span><span class="pun">,</span><span class="pln">r</span><span class="pun">;</span><span class="pln">
	</span><span class="kwd">for</span><span class="pun">(</span><span class="pln">i </span><span class="pun">=</span><span class="pln"> </span><span class="lit">2</span><span class="pun">;</span><span class="pln"> i </span><span class="pun">&lt;=</span><span class="pln"> </span><span class="lit">100</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">
		r</span><span class="pun">=</span><span class="lit">1</span><span class="pun">;</span><span class="pln">
		</span><span class="kwd">for</span><span class="pun">(</span><span class="pln">j </span><span class="pun">=</span><span class="pln"> </span><span class="lit">2</span><span class="pun">;</span><span class="pln"> j </span><span class="pun">&lt;=</span><span class="pln"> sqrt</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">j</span><span class="pun">)</span><span class="pln">
		</span><span class="pun">{</span><span class="pln">
			r</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">
			</span><span class="kwd">if</span><span class="pun">(</span><span class="pln">r </span><span class="pun">==</span><span class="pln"> </span><span class="lit">0</span><span class="pun">)</span><span class="pln">
				</span><span class="kwd">break</span><span class="pun">;</span><span class="pln">
		</span><span class="pun">}</span><span class="pln">
	</span><span class="kwd">if</span><span class="pun">(</span><span class="pln">r</span><span class="pun">!=</span><span class="lit">0</span><span class="pun">)</span><span class="pln">
		printf</span><span class="pun">(</span><span class="str">"%d\n"</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">

    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:

2
3
5
7
11
13
17
19
23
29
31
37
41
43
47
53
59
61
67
71
73
79
83
89
97

Explanation:

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