#include< stdio.h>
int main(){
    int m=0, n=0;
    
   
    printf("Enter the range: ");
    scanf("%d", &m);
    scanf("%d", &n);
    
   
    while(m<=n){
        
      
        if(m%2 == 0){
        printf("%d ", m);
        }
        m++;
    }
    
getch();
}

Program Explanation

Step 1 : Include header files (#include< stdio.h> and #include< conio.h>).

Step 2 : Start with main function with return type.

Step 3 : parenthesis to start and end the program { }.

Step 4 : declare variables with data type i.e, 'n=0 , m=0' is an integer type so we use "int" data type.

Step 5 : Use output function printf() to print the output on the screen.

Step 6 : Use input function scanf() to get input from the user.

Step 7 : here, we have even numbers within a range using while loop, enter a the range : , we can enter 10 30 (m=10 , n=30), then check the condition (m <= n), and condition was true then , calculate this condition if(m%2 == 0) m modulus 2 the value is equal to 0, then print the value of m and then loop was go to m++ , and the value of m is increment the original value ,(m=11), this value was go to loop , and check condition .the condition was true loop was goes inside the body,and condition was false loop was goes outside the body.

Step 8 : using getch() function to hold the screen.