Paying attention when doing algorithm

- When declaring a variable , We should assign it to 0 ;
for example:

double x;
for(int i=0; i<100; i++)
x+=certainfunction(i);

The preceding code won't work because x hasn't assigned to any. Sometimes I forget this assignment, so the result  is an error "Local variable is not assigned".

- Type conversation

double certainfunction(int x)
{
return 1/(3*x);
}

This code will excutate but the expected result will be wrong, because of 1/(3*x) =0  for x=2, 3,5, .....

To make this code work properly,  we must cast the return result as follow:

return (double)(1/(3*x));

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