APTITUDE Q&A

QUESTIONS WITH ANSWERS
1.Can you write 31 using only digit 3 five times?

solution:

(3^3)+3+(3/3)=31

	2.An accurate clock shows 8 o'clock in the morning. Through how may degrees will the hour hand rotate when the clock shows 2 o'clock in the afternoon?
	A. 144º B. 150º C. 168º D. 180º

Answer: Option D

Explanation:

Angle traced by the hour hand in 6 hours =		360	x 6		º	= 180º.
		12

3.

Which of the following statements should be used to obtain a remainder after dividing 3.14 by 2.1 ?

A. rem = 3.14 % 2.1; B. rem = modf(3.14, 2.1); C. rem = fmod(3.14, 2.1); D. Remainder cannot be obtain in floating point division. Answer & Explanation Answer: Option C Explanation: fmod(x,y) - Calculates x modulo y, the remainder of x/y. This function is the same as the modulus operator. But fmod() performs floating point divisions. Example: #include #include int main () { printf ("fmod of 3.14/2.1 is %lf\n", fmod (3.14,2.1) ); return 0; } Output: fmod of 3.14/2.1 is 1.040000 4. Is there any difference between following declarations? 1 : extern int fun(); 2 : int fun(); A. Both are identical B. No difference, except extern int fun(); is probably in another file C. int fun(); is overrided with extern int fun(); D. None of these Answer & Explanation Answer: Option B Explanation: extern int fun(); declaration in C is to indicate the existence of a global function and it is defined externally to the current module or in another file. int fun(); declaration in C is to indicate the existence of a function inside the current module or in the same file. 5. How would you round off a value from 1.66 to 2.0? A. ceil(1.66) B. floor(1.66) C. roundup(1.66) D. roundto(1.66) Answer & Explanation Answer: Option A Explanation: /* Example for ceil() and floor() functions: */ #include #include int main() { printf("\n Result : %f" , ceil(1.66) ); printf("\n Result : %f" , floor(1.66) ); return 0; } // Output: Result : 2.000000 // Output: Result : 1.000000 6. The keyword used to transfer control from a function back to the calling function is A. switch B. goto C. go back D. return Answer & Explanation Answer: Option D Explanation: The keyword return is used to transfer control from a function back to the calling function. Example: #include int add(int, int); /* Function prototype */ int main() { int a = 4, b = 3, c; c = add(a, b); printf("c = %d\n", c); return 0; } int add(int a, int b) { /* returns the value and control back to main() function */ return (a+b); } Output: c = 7