TCS Company Programming

Which of the following special symbol allowed in a variable name?
1. (underscore)
2. - (hyphen)
3. | (pipeline)
4. * (asterisk)

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TCS Other Question

int **ptr; is?
1. Pointer to integer
2. None of these
3. Pointer to pointer
4. Invalid declaration
All keywords in C are in
1. Uppercase letters
2. None of these
3. Lowercase letters
4. Camel Case letters