Print even numbers in c

• Lets see how to write a c program to print even numbers using c programming.\
• Its a basic example to print only even numbers 
• Use for loop and iterate from 1 to n.
• In each iteration check if number if divisible by 2 (n%2 == 0). if yes then its a even number otherwise it is a odd number.
• C program to print even numbers from 1 to n. 

1. #include<stdio.h> 
2. //write a program to print even numbers in c 
3. //www.instanceofjava.com
4. int main()
5. {
6.     // declare variables 
7.     int number,i;
8.     //read input from user 
9.     printf("Enter a number: ");
10.     scanf("%d", &number);
11. 
    
12.    //iterate and check if it a even number or not 
13.   
14.     for (i=1; i<=number; i++){
15.         
16.         if(i%2 ==0){
17.           printf("%d\n" ,i);
18.                
19.         }
20.               
21.         }
22.         
23.    getch();
24. }

Output:

1. Enter a number: 12
2. 2
3. 4
4. 6
5. 8
6. 10
7. 12

#2 print even numbers in c using while loop

• Now we will try to print even numbers using while loop
• Only difference is replace for with while loop
• Variable initialization will be done before loop
• condition will be inside while(condition)
• increment or decrement will be last line of while block 
• Lets print even numbers using while loop from 1 to n.

1. #include<stdio.h> 
2. //write a program to print even numbers in c using while loop
3. //www.instanceofjava.com
4. int main()
5. {
6.     // declare variables 
7.     int number,i;
8.     //read input from user 
9.     printf("Enter a number: ");
10.     scanf("%d", &number);
11. 
    
12.    //iterate and check if it a even number or not 
13.      i=1;
14.        
15.         while(i<=number){
16.                 
17.         if(i%2 ==0){
18.           printf("%d\n" ,i);
19.                
20.         }
21.           i++  ;  
22.         }
23.         
24.    getch();
25. }

Output:

1. Enter a number: 20
2. 2
3. 4
4. 6
5. 8
6. 10
7. 12
8. 14
9. 16
10. 18
11. 20