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    How to reverse number in PHP without using function?
    To reverse a number in PHP without using function declare a variable to store the reversed number, and initially assign zero to it. Now, extract the last digit from the original number, multiply the reverse number with 10, add the extracted digit to reversed number, and divide the original number by 10. Repeat this iteration until original number becomes zero.
    C program to swap two numbers using bitwise XOR operator
    Here we develop a C program that swaps two integers using bitwise XOR operator. Swapping two numbers using bitwise operator XOR is a programming trick that is usually asked in technical interviews. This solution only works for unsigned integer types. It won't work for floating point, pointers, and struct/union types.
    Difference Between For and While Loop in C
    This page explains differences between for and while loop. Both for and while loops are entry controlled loops but usually for is used when number of iteration are known in advance, whereas while is used when number of iterations are not known beforehand.