Sum of n numbers till encounters -999 using C Language program with Example

Sum of n numbers till encounters -999 using C program will check the number is equal to -999. If it is same, then it will break the statement. Otherwise it will sum the given numbers and executes the condition until the condition is unsatisfied.

//Header files
# include <stdio.h>
# include <conio.h>
 
void main()
{
    //Program variables
    int num,sum=0;
 
    clrscr();//Function used to clear previous output
 
    do //Unconditional statement
    {
    printf("Enter the number(-999 to exit) : "); //Display function
        scanf("%d",&num); //Getting input function
        if(num!= -999)
            sum += num;
        else
            break;
    }while(num != -999);
    printf("sum = %d",sum);
    getch();
}