what is the role of set precision?

[AmerJamil]

i have two questions

1st is can any one please tell me what is the role of setprecision in C++, why it is used?

2nd is : this statement

totalS+=sales[i][j];

is equivalent to what, i.e what is the role of this +=

thanks alot

[jonsca]

Check out http://www.cplusplus.com/reference/iostream/manipulators/setprecision/ , in particular the example.

[AmerJamil]

ok thanks.. please answer my 2nd question as well..

[frogboy77]

a+=b;

is equivalent to

a=a+b;