What are advantages and disadvantages of external storage class?

Question:What are advantages and disadvantages of external storage class??

Answer: Advantages of external storage class1)Persistent storage of a variable retains the latest value2)The value is globally available Disadvantages of  external storage class1)The storage for an external variable exists even when the variable is not needed2)The side effect may produce surprising output3)Modification of the program is difficult4)Generality of a program is affected

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