Finding Light Bill as Unit

            main()  
            {  
                int r, c, s = 0;  
                clrscr();  
            
                for(r = 1; r <= 5; r++)  
                {  
                    s = 1;  
                    for(c = 1; c <= r; c++)  
                    {  
                        s = s * c;  
                    }  
            
                    printf("fact of %d=%d", r, s);  
                    printf("\n");  
                }  
                        
                getch();  
            }  
            

Output: