C program to print the number pattern. 
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

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

2959

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"> i</span><span class="pun">=</span><span class="lit">1</span><span class="pun">,</span><span class="pln">j</span><span class="pun">;</span><span class="pln">
    </span><span class="kwd">while</span><span class="pln"> </span><span class="pun">(</span><span class="pln">i </span><span class="pun">&lt;=</span><span class="pln"> </span><span class="lit">5</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">1</span><span class="pun">;</span><span class="pln">
        </span><span class="kwd">while</span><span class="pln"> </span><span class="pun">(</span><span class="pln">j </span><span class="pun">&lt;=</span><span class="pln"> i </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">"%d "</span><span class="pun">,</span><span class="pln">j</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">
        printf</span><span class="pun">(</span><span class="str">"\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">
    </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:

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
Press any key to continue . . .

Explanation:

In this program, nested while loop is used to print the pattern. The outermost loop runs 5 times and for every loop, the innermost loop runs i times which is 1 at first, meaning only "1" is printed, then on the next loop it's 2 numbers printing "1 2" and so on till 5 iterations of the loop executes, printing "1 2 3 4 5". This way, the given number pattern is printed.

This Particular section is dedicated to Programs only. If you want learn more about C Programming Language. Then you can visit below links to get more depth on this subject.