about the for statement

for(int val=1;val<=10;val++)

sum+=val;

 

The for statment has two parts:the for header and the for body.the header itself consists of three parts :an init-statement,a condition ,and and express.

 

here just want to remind me is :

when we exit the for loop.the variable val is no longger accessible. It is not  possible to use val after this loop terminates.Hower ,not all the compilers enforce this requirement.

 

In pre-Standar C++ names defined in for header were accessible outside the for itself.But new c++ stander  is unaccessible outside.