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return, break, continue instructions

return

The return instruction is used either to return a function value or to terminate the execution of a function. The exit may be from anywhere within the function body, including loops or nested blocks. If the function returns a value, the return instruction is required, furthermore it contains the expression of the appropriate type.

func uint myfunc
{
   ...
   fornum i, 100
   {
      if error : return 0
      ...
   }
   return a + b
}

break

The break instruction terminates the execution of the loop. break is likely to be located within nested blocks. If a program contains several nested loops, break will exit the current loop.

while b > c
{
   for i = 100, i > 0, i--
   {
      if !myfunc( i )
      {
          break   //exit from for
      }
   }
   b++
}

continue

The continue instruction may occur within loops and attempts to transfer control to the loop expression, which is used to increment or decrement the counter (for the following loops: for, fornum, foreach) or to the conditional expression (for while and do-while loops); moreover, the execution of the loop body is not completely executed. The instruction executes only the most tightly enclosing loop, if this loop is nested.

fornum i, 100
{
   if i > 10 && i < 20
   {
      continue 
   }
   a += i // The given expression is not evaluated if i>10 and i<20
}

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