tilde symbol

C Program To Add Two Numbers without using Plus Operator

Lets write a C program to perform addition of 2 numbers without using plus symbol or the addition operator(+).

In this video tutorial we are using ~(tilde symbol) bitwise complement operator to perform the operation to get to the anticipated result.

Example: If user enters 2 numbers. a = 8 and b = 7. To add 8 and 7 we use result = a + b. And the result will be 15. But in this C program we are not using plus(+) operation, but still we must get the same result 15(for above input).

Logic To Add Two Numbers without using Plus Operator

If num = 7;
result = ~num; will give 1s complement of 7, that is -8.
result = -(~num); will give 8.
result = -(~num)-1; will give 7.

Now using this logic, we ask the user to enter 2 numbers. If user enters a = 8 and b = 7. We use the below logic to perform addition, without using plus symbol:

a = 8, b = 7;
add = a – ~b – 1;
add = 8 – (-8) – 1;
add = 8 + 8 – 1;
add = 8 + 7;
add = 15;

This would give proper required result.

Source Code: C Program To Add Two Numbers without using Plus Operator

#include < stdio.h >

int main()
{
    int a, b, add;

    printf("Enter 2 numbers for addition\n");
    scanf("%d%d", &a, &b);

    add = a-~b-1; 

    printf("Addition of %d and %d is %d\n", a, b, add);

    return 0;
}

Output 1:
Enter 2 numbers for addition
1
2
Addition of 1 and 2 is 3

Output 2:
Enter 2 numbers for addition
-1
2
Addition of -1 and 2 is 1

Output 3:
Enter 2 numbers for addition
-1
-2
Addition of -1 and -2 is -3

Output 4:
Enter 2 numbers for addition
-5
5
Addition of -5 and 5 is 0

Output 5:
Enter 2 numbers for addition
5
-10
Addition of 5 and -10 is -5

Video Tutorial: C Program To Add Two Numbers without using Plus Operator

[youtube https://www.youtube.com/watch?v=Gw1lXqCKvdI]

YouTube Link: https://www.youtube.com/watch?v=Gw1lXqCKvdI [Watch the Video In Full Screen.]

Note: These kind of tricky C programming questions can be asked in your viva or company interviews or competitive exams or even in your academic exams. So be prepared.

For list of all c programming interviews / viva question and answers visit: C Programming Interview / Viva Q&A List

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert

C Program To Subtract Two Numbers without using Minus Operator

Lets write a C program to perform subtraction of 2 numbers without using minus symbol or the subtraction operation(-).

In this video tutorial we are using ~(tilde symbol) bitwise complement operator to perform the operation to get to the anticipated result.

Example: If user enters 2 numbers. a = 15 and b = 5. To subtract 10 from 5 we use result = a – b. And the result will be 10. But in this C program we are not using minus(-) operation, but still we must get the same result 10(for above input).

Logic To Subtract Two Numbers without using Minus Operator

If num = 10;
result = ~num; will give 1s complement of 10, that is -11.
result = ~num+1; will give 2s complement of 10, that is -10.

Now using this logic, we ask the user to enter 2 numbers. If user enters a = 10 and b = 5. We use the below logic to perform subtraction, but without using minus symbol:

a = 10, b = 5;
sub = a + ~b + 1;
sub = 10 + (-6) + 1;
sub = 10 – 6 + 1;
sub = 10 – 5;
sub = 5;

This would give proper required result.

Source Code: C Program To Subtract Two Numbers without using Minus Operator

#include < stdio.h >

int main()
{
    int a, b, sub;

    printf("Enter 2 numbers\n");
    scanf("%d%d", &a, &b);

    sub = a+~b+1;

    printf("Subtraction of %d and %d is %d\n", a, b, sub);

    return 0;
}

Output 1:
Enter 2 numbers
4
10
Subtraction of 4 and 10 is -6

Output 2:
Enter 2 numbers
5
10
Subtraction of 5 and 10 is -5

Output 3:
Enter 2 numbers
10
5
Subtraction of 10 and 5 is 5

Output 4:
Enter 2 numbers
5
5
Subtraction of 5 and 5 is 0

Output 5:
Enter 2 numbers
5
-5
Subtraction of 5 and -5 is 10

Video Tutorial: C Program To Subtract Two Numbers without using Minus Operator

[youtube https://www.youtube.com/watch?v=YG1bDNtO5X8]

YouTube Link: https://www.youtube.com/watch?v=YG1bDNtO5X8 [Watch the Video In Full Screen.]

Note: These kind of tricky C programming questions can be asked in your viva or company interviews or competitive exams or even in your academic exams. So be prepared.

For list of all c programming interviews / viva question and answers visit: C Programming Interview / Viva Q&A List

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert