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Question
Consider the following variable declarations and definations in C . (i) int var _ 9 =1 ; (ii) int 9 _ var =2; (iii) int + =3; Choose the correct statement w.r.t above variables.
Both i. and ii. are valid
Only i. is valid
Both i. & iii. are valid
All of these
ANSWER : 3
Descrption
<p><span id = "docs - internal - guid - fdab0c09 - 7fff - 093f - bcd2 - 0f6213b414e2"><span style = "font - size: 12pt; font - family: Arial; font - variant - numeric: normal; font - variant - east - asian: normal; vertical - align: baseline; white - space: pre - wrap;">In C language, a variable name can consist of letters, digits and underscore i.e. _ . But a variable name has to start with either letter or underscore. It can't start with a digit. So valid variables are var_9 and _ from the above question. Even two back to back underscore i.e. __ is also a valid variable name. Even _9 is a valid variable. But 9var and 9_ are invalid variables in C.</span></span></p>
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