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I've recently come across a while statement that uses 1 == 1 instead of true.
Example:
while (1 == 1)
{
// Do something
}
Instead of:
while (true)
{
// Do something
}
They both appear to be correct and generate the same result but I wanted to know (apart from why a developer would use 1 == 1 instead of true - style/habit aside) what impact this has from a compiler perspective, is there a greater overhead in using the comparison operator instead of true?
927
The while(1) or while(any non-zero value) is used for infinite loop. There is no condition for while. As 1 or any non-zero value is present, then the condition is always true. So what are present inside the loop that will be executed forever.
While loop is used to execute a block of code repeatedly until given boolean condition evaluated to False. If we write while True then the loop will run forever.
while True: ... means infinite loop. The while statement is often used of a finite loop.
C++ while Loop If the condition evaluates to true , the code inside the while loop is executed. The condition is evaluated again. This process continues until the condition is false .
There is no difference. The compiler will optimize them to the same IL.
1 == 1
IL_0000: nop
IL_0001: br.s IL_0005
IL_0003: nop
IL_0004: nop
IL_0005: ldc.i4.1
IL_0006: stloc.0 // CS$4$0000
IL_0007: br.s IL_0003
true
IL_0000: nop
IL_0001: br.s IL_0005
IL_0003: nop
IL_0004: nop
IL_0005: ldc.i4.1
IL_0006: stloc.0 // CS$4$0000
IL_0007: br.s IL_0003
Any choice of one or the other is purely stylistic preference on the part of the developer.
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