Thread: A Simple Question,Answer would be Highly Appreciated.

Hi,I'm a beginner with C.
And a Bit confused with the Following Snippet,can you guys help?

Code Snippet
The Following Function Excepts 25 Numbers from the Keyboard & Prints the sum of the +ve Number's

#include <stdio.h>
main()
{int i,sum,num;
for(i=0;i<25;i=i+1)
{
puts("Enter a Number");
scanf("%d,& num");
fflush(stdin);

if(num <=0) /* non positive numbers*/
continue;
sum=sum+num
}
printf("The sum of positive numbers entered is %d\n",sum);
}

Questions
1.can you Explain "sum=sum+num"
2.Can you give me a clear idea of things? and explain to me the function in detail,please!

Thanks for the Help,

Originally Posted by matsp

So, can you point out which parts of the code you actually DO understand - it's absolutely no point in me going through and spending my time explaining what you already know.

Also, using fflush(stdin) is undefined - it does what this program expects in some C libraries [usually the C library is bundled with the compiler]. Another C library would be perfectly within it's rights causing your application to crash - because fflush is only defined for output files. stdin is an input file, so it may not have the components in place that fflush needs to do it's job, and if there's no specific checking for that, it may cause the application to crash. And like driving through a red light at a junction, you'd not have any way to say "it wasn't my fault".

--
Mats

Actually I didn't write the code,I actually copied It from my Text book on to the Forum so someone could actually explain to me in a little more Detail.

Originally Posted by vart

yes user takes garbage, adds positive value and gets alot more garbage

cant quite get what your saying!
Is "sum" a function??

Originally Posted by parastar

cant quite get what your saying!
Is "sum" a function??

Of course not. Surely you recognize a variable declaration when you see one? "int i, sum, num"?

Originally Posted by parastar

Actually I didn't write the code,I actually copied It from my Text book on to the Forum so someone could actually explain to me in a little more Detail.

Did you try reading the book? Or speaking with your teacher? Two best first tries.