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why do we have to use 'return 0' ?

, 5 Dec 2013 CPOL 41.7K 1
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Almost in every program we code there is mostly return 0 ; in the end of main function. I know This means all things are going on way. But what does it mean? What exactly are there at the background of this ? Thanks.
Almost in every program we code there is mostly
return 0 ;
in the end of main function. I know This means all things are going on way. But what does it mean? What exactly are there at the background of this ? Thanks.

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Coder_Jack
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