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21. void can be used
as a data-type of a function that returns nothing to its calling environment
inside the brackets of a function that does not need any argument
in an expression
both (A) & (B)
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22. Any C program
must contain at least one function
need not contain any function
needs input data
none of the above
23. The following program main () { int a = 4; change { a }; printf ("%d", a); } change (a) int a; { printf("%d", ++a); } outputs
55
45
54
44
24. The following program main() { inc(); inc(); inc(); } inc() { static int x; printf("%d", ++x); }
prints 012
prints 123
prints 3 consecutive, but unpredictable numbers
prints 111
25. The following program main() { int abc(); abc (); ( *abc) (); } int abc( ) { printf ("come"); }
results in a compilation error
prints come come
results in a run time
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