Operators

1. Program to find sum of two numbers without using '+' operator.

   #include<stdio.h>
   int main(){
     int n1, n2;
     scanf("%d %d",&n1,&n2);
     printf("%d",n1-(-n2));
     return 0;
   }
   

   Sample Input
   5 -2
   Sample Output
   3
   

2. Program to find largest number amoung two without using relational operators.

   #include<stdio.h>
   int main(){
     int n1, n2;
     scanf("%d %d",&n1,&n2);
     n1/n2?printf("%d",n1):printf("%d",n2);
     return 0;
   }
   

   Sample Input
   5 10
   Sample Output
   10
   

3. Program to find second largest number among three numbers without using relation operators.

   #include<stdio.h>
   int main(){
     int n1,n2,n3;
     scanf("%d%d%d",&n1,&n2,&n3);
     n1/n2?(n1/n3?printf("%d",n3):printf("%d",n1)):(n2/n3?printf("%d",n3):printf("%d",n2));
     return 0;
   }
   

   Sample Input
   5 1 2 Sample Output
   2

4. Program to check whether the number is even or odd without using '%' operator.

   #include<stdio.h>
   int main(){
     int n;
     scanf("%d",&n);
     (n/2)*2==n?printf("%d is even",n):printf("%d is odd",n);
     return 0;
   }
   

   Sample Input
   5
   Sample Output
   5 is odd
   

5. Program to swap two numbers without using temporary variable.

   #include<stdio.h>
   int main(){
     int n1,n2;
     scanf("%d%d",&n1,&n2);
     //For another solution replace + with * and - with /
     n1 = n1+n2;
     n2 = n1-n2;
     n1 = n1-n2;
     printf("%d %d",n1,n2);
     return 0;
   }
   

   Sample Input
   5 9
   Sample Output
   9 5
   

6. Program to swap two numbers without using temporary variable and arithmetic operators.

   #include<stdio.h>
   int main(){
     int n1,n2;
     scanf("%d%d",&n1,&n2);
     n1 = n1^n2;
     n2 = n1^n2;
     n1 = n1^n2;
     printf("%d %d",n1,n2);
     return 0;
   }
   

   Sample Input
   5 9
   Sample Output
   9 5
   

7. Program to check whether the number is even or odd using bit-wise operator.

   #include<stdio.h>
   int main(){
     int n;
     scanf("%d",&n);
     n&1?printf("%d is odd",n):printf("%d is even",n);
     return 0;
   }
   

   Sample Input
   5
   Sample Output
   5 is odd
   

8. Program to count number of bits set.

   #include<stdio.h>
   int main(){
     unsigned int n;
     int c=0;
     scanf("%d",&n);
     while(n!=0) {
       if(n&1)
         c++;
       n>>=1;
     }
     printf("Number of bits set is %d",c);
     return 0;
   }
   

   Sample Input
   5
   Sample Output
   Number of bits set is 2