Which one of the following is not a valid identifier?

Which one of the following is not a valid identifier?

_study2online

1study2online

study2online

study2online1

Answer : B

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1) What will be printed after execution of the following program code?

main()
 {
       printf("\\nab");
        printf("\\bsi");
        printf("\\rha");
  }

2) Which one of the following is not a reserved keyword for C?

auto

case

main

default

3) Binary number uses only ________ digits.

Two

Three

Four

Five

4) Which of the following is related to machine language?

Difficult to learn

First generation language

Machine dependent

All of the above

5) What are the types of linkages?

Internal and External

External, Internal and None

External and None

Internal