Is it necessary to return 0 in a program? Why?

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Phani Reddy

Professional with 10+ years of experience. Expert in teaching C, Java, Python, Data Structures

It is good to return 0 , as 0 means TRUE for the operating system. Values other than 0 will have some other meaning in the operating system perspective. When we are returning 0, it is an indication that program completed successfully. In case of abnormal termination, You will be notified with different...
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It is good to return 0 , as 0 means TRUE for the operating system. Values other than 0 will have some other meaning in the operating system perspective. When we are returning 0, it is an indication that program completed successfully. In case of abnormal termination, You will be notified with different values, which has specific meaning. For example pressing Ctrl-C in the middle of the program will return 130. read less
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Tutor

It depends, It depends on your method data type, for suppose you have created a method type as void so you don't need to return, but for suppose you have created a method as int or string or any data type then you have to return the value.
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Computer Wizard

if function has return type then return 0 otherwise not matter
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Software Architect

Its always considered as a healthy programming to return something from your program. Advantages: You can control what kind of message you want to return if your program fails and what kind of message you want to return if your program passes. I guess you question is in context of main method. That...
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Its always considered as a healthy programming to return something from your program. Advantages: You can control what kind of message you want to return if your program fails and what kind of message you want to return if your program passes. I guess you question is in context of main method. That method is invoked by OS whenever you run the program, so it will be good if OS knows weather your program passed or failed. read less
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