How to add Two Number without using Operator in C?

You may have read my previous article where I have mentioned C is one of the simplest programming languages. It’s for the beginners. If you want to be the master of C you have to explore and try new things. Or doing the same things with many ways.

In this code, I will share how you can add two number without using the operator in C.

This is one of the tricky questions asked in many of the placement interviews.

Solution 1:

If you find the difficulty in writing this code, here is a hint for you.

Hint: You can do this by using printf() function which returns the number of characters written to the output console.

Minimize the browser and try this program by user self first.

#include<stdio.h>
void addTwoNumber(int m, int n)
{
    printf(“%d”,printf(“%*c%*c”,m,’ ‘,n,’ ‘));
}
void main()
{
     addTwoNumber(4,5);
}

Note: This program also print the white spaces on the output console. You can ignore as it is not visible.

Solution 1:

This solution is provided by Fulvio Baccaglini.

You can use math.h library. Here is an idea, based on math.h atan2 performing a division, and some auxiliary transformations, to turn the division into multiplication, and then multiplication into addition.

Note: This solution is not purely without operates as we are using exp, pow…  operators. We can only say, this solution is without addition operators.

#include<stdio.h>
#include<math.h>

void addTwoNumber(int m, int n)
{
    int nSum;
    nSum = log (tan (atan2 (exp (m), pow (exp (n), floor (log (0.5))))));
    printf("%d", nSum);
}

void main()
{
    addTwoNumber(11,15);
}

If you like to take the challenge and explore the C language, try your best to write a code for following tricky questions.

• Find Next Greater Number with Same Set of Digits
• Swap two values without using temporary variable
• Program to Print 1 to 100 without Loop, Recursion or Goto

Happy Programming!