Which of the following header file defines the standard I/O predefined functions?

(a)

stdio.h

(b)

math.h

(c)

string.h

(d)

ctype.h

Which function is used to check whether a character is alphanumeric or not:

(a)

isalpha ( )

(b)

isdigit ()

(c)

isalnum ()

(d)

islower ()

Which function begins the program execution?

(a)

isalpha()

(b)

isdigit()

(c)

main()

(d)

islower()

Which of the following function is with a return value and without any argument?

(a)

x=display(int, int)

(b)

x=display()

(c)

y=display(float)

(d)

display(int)

Which is return data type of the function prototype of add(int, int);?

(a)

int

(b)

float

(c)

char

(d)

double