C program: swapping of 2 numbers without using 3rd variable

#include<stdio.h>

int main(){

    int a,b,temp;

   

    printf("Enter any two integers: ");

    scanf("%d%d",&a,&b);

    printf("Before swapping: a = %d, b=%d",a,b);

    a=a+b;

    b=a-b;

    a=a-b;

    printf("After swapping: a = %d, b=%d",a,b);

    return 0;

}

C program: subtraction of two numbers without using minus operator

#include<stdio.h>

int main(){

   

    int a,b;

    int sum;

    printf("Enter any two integers: ");

    scanf("%d%d",&a,&b);

    sum = a + ~b + 1;

    printf("Difference of two integers: %d",sum);

    return 0;

}

Sample Output:

Enter any two integers: 7 3

Difference of two integers: 4

C program: addition of two numbers without using plus operator

#include<stdio.h>

int main(){

   

    int a,b;

    int sum;

    printf("Enter any two integers: ");

    scanf("%d%d",&a,&b);

    //sum = a - (-b);

    sum = a - ~b -1;

    printf("Sum of two integers: %d",sum);

    return 0;

}

Sample output:

Enter any two integers: 2 15

Sum of two integers: 17

C program- to reverse a number

#include<stdio.h>

int main(){

    int num,r,reverse=0;

    printf("Enter any number: ");

    scanf("%d",&num);

    while(num){

         r=num%10;

         reverse=reverse*10+r;

         num=num/10;

    }

    printf("Reversed of number: %d",reverse);

    return 0;

}

Sample output:

Enter any number: 56

Reversed of number: 65