Example of while loop using logical operator

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

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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"> 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="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">i </span><span class="pun">&lt;=</span><span class="pln"> </span><span class="lit">4</span><span class="pln"> </span><span class="pun">||</span><span class="pln"> j </span><span class="pun">&lt;=</span><span class="pln"> </span><span class="lit">3</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 %d\n"</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">
	i</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">
   </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 2
3 3
4 4
Press any key to continue . . .

Explanation:

Just like relational operators (<, >, >=, <=, ! =, ==), we can also use logical operators in while loop. The following scenarios are valid :

 
while(num1<=10 && num2<=10)

-using AND(&&) operator, which means both the conditions should be true.

 
while(num1<=10||num2<=10)

– OR(||) operator, this loop will run until both conditions return false.

 
while(num1!=num2 &&num1 <=num2)

– Here we are using two logical operators NOT (!) and AND(&&).

 
while(num1!=10 ||num2>=num1)

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