/* CIS 790           JAVA PROGRAMMING (DOS)       PROF. AUCIELLO
    TOPICS:   programs vs applets
              for loops: start value, end value, increment
              System.out.println  as output statement to screen
              Structure
*/

ASSIGNMENT:  WRITE A PROGRAM THAT WILL GIVE THE OUTPUT BELOW:

i = 0 rolling sum = 0
i = 1 rolling sum = 1
i = 2 rolling sum = 3
i = 3 rolling sum = 6
i = 4 rolling sum = 10
i = 5 rolling sum = 15
i = 6 rolling sum = 21
i = 7 rolling sum = 28
i = 8 rolling sum = 36
i = 9 rolling sum = 45
i = 10 rolling sum = 55
i = 11 rolling sum = 66
i = 12 rolling sum = 78
i = 13 rolling sum = 91
i = 14 rolling sum = 105
i = 15 rolling sum = 120
i = 16 rolling sum = 136
i = 17 rolling sum = 153
i = 18 rolling sum = 171
i = 19 rolling sum = 190
i = 20 rolling sum = 210
The sum of 1 to 20 is 210


THE INTERNAL NAME OF THIS PROGRAM IS addnum.  ITS EXTERNAL NAME IS addnum.java

to compile:            type   javac addnum.java
to execute in DOS:     type   java addnum    (it displays on screen)

1.  program starts by naming the class. same name as external file name.
2.  define the class as main, allow for passing String arguments.
3.  bracket that includes the entire class.
4.  define loop counter as an integer and set it to 0.
5.  define an accumulator for the total and initialize to 0.
6.  start a loop that begins with 0, exits at 101, and increments by 1
7.  accumulate a total.
8.  print the index and the total
9.  when out of the for-loop, print the total.

(watch the brackets)


SELECT FROM THESE JAVA STATEMENTS:

public static void main(String args[])    
class addnum                               // names program "addnum"
{
for ( i=0; i<21; i++)
{
sum = i + sum;
System.out.println("i = " + i + " rolling sum = " + sum);
}
{ int i = 0;                              // defines i as int = 0
int sum = 0;
}
System.out.println("The sum of 1 to 20 is " + sum);
}