C Fundamentals Objective: Sheet 1
Q1.int main()
{
char a = '\012';
printf(“%d”, a);
return 0;
}
a) 10 b) 12 c) 0 d) Compiler Error
Q2. Which of the following statements should be used to obtain a remainder after dividing 3.14
by 2.1 ?
a) remainder = 3.14 % 2.1 b) remainder = modf(3.14, 2.1)
c) remainder = fmod(3.14, 2.1)
d) remainder cannot be obtained in floating point division.
Q3. #define square(x) x*x
int main()
{
int x;
x = 36/square(6);
printf("%d", x);
return 0;
}
a) 6 b) 36 c) 1 d) 0
Q4. How would a value 1.66 is round off to 2.0?
a) ceil(1.66) b) floor(1.66) c) roundup(1.66) d) roundto(1.66)
Q5. Which of the following is the correct order of evaluation for the expression:
“z = x + y * z / 4 % 2 – 1”
a) * / % + - = b) = * / % + - c) / * % - + = d) * % / - + =
Q6. #define CUBE(x) (x*x*x)
int main()
{
int a, b = 3;
a = CUBE( b++);
printf(“%d, %d”, a, b);
return 0;
}
a) 27, 5 b) 27, 6 c) 64, 6 d) 64, 5
Q7. Which of the following is true?
a) gets() can read a string with newline characters but a normal scanf() with %s can not.
b) gets() can read a string with spaces but a normal scanf() with %s can not.
c) gets() can always replace scanf() without any additional code.
d) none of the above
Q8. int main()
{
int x = 50;
{
int x = 10;
printf(“%d”, x);
}
printf(“%d”, x);
return 0;
}
a) 10 10 b) 50 50 c) 10 50 d) 50 10
Q9. #define SWAP(a, b) int t; t = a, a = b, b = t;
int main()
{
int a = 10, b = 20;
SWAP(a, b);
printf(“%d, %d”, a, b);
return 0;
}
a) 10, 20 b) Error: Declaration not allowed in macros.
c) 20, 10 d) Error: Undefined symbol t.
Q10. int main()
{
int i = 5, j = 10, k = 15;
printf(“%d”, sizeof(k /= i+j));
printf(“%d”, k);
return 0;
}
a) 4 1 b) 4 15 c) 1 1 sd) 1 15
Q11. int main()
{
int i = -3, j = 2, k = 0, m;
m = ++i && ++j && ++k;
printf(“%d, %d, %d, %d”,i, j, k, m);
return 0;
}
a) -2, 3, 1, 1 b) 2, 3, 1, 2 c) 1, 2, 3, 1 d) 3, 3, 1, 2
Q12. To round off value of a variable x from float to int, correct way is:
a) y = (int) (x + 0.5) b) y = int(x + 0.5) c) y = (int) x + 0.5 d) y = (int) ((int) x + 0.5
Q13. #include<math.h>
int main()
{
printf(“%d, %d, %d”,sizeof(3.14f),sizeof(3.14),sizeof(3.14l));
return 0;
}
a) 4, 4, 4 b) 4, 8, 8 c) 4, 8, 10 d) 4, 10, 10
Q14.In C, which of the following is valid datatypes?
a) “long long double” b) “unsigned long long int”
c) “unsigned long double” d) all are valid e) all are invalid
Q15. int main()
{
printf(“%x\n”, -2 << 2);
return 0;
}
a) ffff b) 0 c) fff8 d) Runtime Error
Q16. int main()
{
int x = 45;
printf(“%d, %d, %d”, x<=45, x=40, x>=10);
return 0;
}
a) 1, 45, 1 b) 1, 45, 0 c) 1, 1, 1 d) 1, 40, 1
Q17. int main()
{
int k, num = 30;
k = (num > 5 ? ( num <= 10 ? 100 : 200) : 500);
printf(“%d”, num);
return 0;
}
a) 30 b) 100 c) 200 d) 500
Q18. int main()
{
int i;
#if A
printf(“Enter any number : “);
scanf(“%d”, &i);
#elif B
printf(“The number is odd”);
printf 0;
}
a) The number is odd b) Enter any number : 10 c) Garbage value
d) Compiler Error: Unexpected end of file because there is no matching #endif.
Q19.int main()
{
char ch;
ch = 'A';
printf(“%c, ”, ch >= 'A' && ch <= 'Z' ? ch + 'a' – 'A' : ch);
printf(%c”, ch >= 'A' && ch <= 'Z' ? ch : ch + 'a' – 'A');
return 0;
}
a) a, A b) A, a c) Compiler Error d) Garbage Value
Q20. Suppose a, b, c and d are int variables. For ternary operator in C (? : ), pick the best
statement:
a) a>b ? : ; is valid statement i.e. 2nd and 3rd operands can be empty and they are implicitly
replaced with non-zero value at run-time.
b) a>b ? c=10 : d=10; is valid statement i.e. based on the value of a and b, either c or d gets
assigned the value of 10.
c) a>b ? (c=10, d=20) : (c=20, d=10); is valid statement i.e. based on the value of a and b, either
c=10, d=20 gets executed or c=20, d=10 gets executed.
d) all of the above.
Q21.int main()
{
int i = 1;
switch(i)
{
printf(“Within switch block”);
case 1: printf(“Case 1”);
break;
case 2: printf(“Case 2”);
break;
default: printf(“Default”);
}
return 0;
}
a) Within switch block b) Within switch block c) Case 1 d) Default
Case 1 Default
Q22.int main()
{
int i = 10, j = 15;
if( i % 2 = j % 3)
printf(“Within if block”);
return 0;
}
a) Compiler Error b) Within if block c) No output will be printed d) None of the above
Q23.int main()
{
int i = 0;
i++;
if(i <= 5)
{
printf(“With in if block”);
exit(0);
main();
}
return 0;
}
a) Prints With in if block only one time. b) Prints With in if block five times.
c) Compiler Error d) Infinite loop
Q24.int main()
{
int a = 100, b = 200, c;
if( !a >= 10 )
b = 300;
c = 200;
printf(“b = %d, c = %d”, b, c);
return 0;
}
a) b = 200, c = 200 b) b = 300, c = 200
c) b = garbage value, c = 200 d) b = 300, c = garbage value
Q25. int main()
{
unsigned int i = 65535;
while( i++ != 0)
printf(“%d ”, ++i);
return 0;
}
a) 0 1 2 3 4 5 .......65535 b) 0 2 4 6 8 ..........65534
c) 1 3 5 7 9 ...........65535 d) Infinite loop
Answers: 1. (a) 2. (c) 3. (b) 4. (a) 5. (a) 6. (b) 7. (b) 8. (c) 9. (c) 10. (b) 11. (a) 12. (a) 13. (c) 14.
(b) 15. (c) 16. (d) 17. (a) 18. (d) 19. (a) 20. (c) 21. (c) 22. (a) 23. (a) 24. (a) 25. (d)
