Consider a scenario where you need to store a variable that can hold values up to 10 billion. Which data type is most suitable?
Answer: C
int max is ~2.1 billion, long int varies (may be 32 or 64 bits). long long int guarantees 64 bits with max ~9.2 quintillion, sufficient for 10 billion.
Q.182Hard
What happens when a volatile variable is declared in a multi-threaded C program?
Answer: B
volatile tells compiler not to optimize variable accesses and to fetch fresh value from memory, useful for hardware registers and shared memory, but doesn't guarantee thread-safety without synchronization.
Q.183Easy
In C programming, when you declare a variable as 'const int x = 5;', what happens if you try to modify it within the program?
Answer: B
The 'const' keyword creates a read-only variable. Once initialized, attempting to modify a const variable results in a compilation error (error: assignment of read-only variable). This is enforced at compile-time, not runtime.
Q.184Easy
What will be the output of the following C code?
int x = 5;
if (x > 3)
printf("A");
else
printf("B");
Answer: A
Since x = 5 and 5 > 3 is true, the if block executes and prints 'A'.
Q.185Easy
Which of the following is NOT a valid control flow statement in C?
Answer: B
foreach is not a standard C control flow statement. C has if-else, switch, for, while, do-while, and goto.
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Q.186Easy
What is the output of this code?
for (int i = 0; i < 3; i++)
printf("%d ", i);
Answer: A
The loop runs from i=0 to i=2 (i < 3), printing '0 1 2 '.
Q.187Easy
What is the difference between 'break' and 'continue' in loops?
Answer: A
break terminates the loop entirely, while continue jumps to the next iteration without executing remaining statements.
Q.188Medium
What will be printed?
int x = 0;
if (x = 5)
printf("True");
else
printf("False");
Answer: A
x = 5 assigns 5 to x and evaluates to 5 (non-zero), which is true. So 'True' is printed.
Q.189Medium
What is the output?
for (int i = 1; i <= 5; i++) {
if (i == 3) break;
printf("%d ", i);
}
Answer: A
When i becomes 3, break is executed, exiting the loop. So only 1 and 2 are printed.
Q.190Medium
What does the following nested if-else produce?
int a = 10, b = 20;
if (a > b)
if (b > 0)
printf("X");
else
printf("Y");
Answer: B
The else clause pairs with the inner if. Since a > b is false, the else block executes printing 'Y'.
Q.191Medium
What is the output of this switch statement?
int x = 2;
switch(x) {
case 1: printf("One"); break;
case 2: printf("Two");
case 3: printf("Three"); break;
default: printf("Other");
}
Answer: B
Case 2 matches. Since there's no break after case 2, fall-through occurs to case 3, printing 'TwoThree'.
Q.192Medium
How many times will this loop execute?
for (int i = 0; i < 5; ++i) {
if (i == 2) continue;
if (i == 4) break;
}
Answer: C
Loop runs for i=0,1,2,3. When i=4, break is executed. The body executes 4 times (iterations for i=0,1,2,3).
Q.193Medium
What is printed by this code?
int x = 5;
while (x-- > 0)
printf("%d ", x);
Answer: B
x-- returns 5 first, then decrements to 4. Loop runs while x > 0, printing 4, 3, 2, 1, 0.
Q.194Medium
What is the output?
int n = 1;
do {
printf("%d ", n);
n++;
} while (n > 5);
Answer: A
The do-while executes once (prints 1), then n becomes 2. Since 2 > 5 is false, the loop exits.
Q.195Easy
Analyze the ternary operator: int x = (5 > 3) ? 10 : 20; What is the value of x?
Answer: A
Since 5 > 3 is true, the ternary operator returns 10, so x = 10.
Q.196Hard
What is the output of this program?
for (int i = 1; i <= 3; i++)
for (int j = 1; j <= 2; j++)
printf("%d", i*j);
printf("\n");
Answer: A
Nested loops: outer i=1,2,3; inner j=1,2. Prints products: 1*1=1, 1*2=2 (newline), 2*1=2, 2*2=4 (newline), etc.
Q.197Easy
What is the behavior of goto in C?
Answer: A
goto transfers program control to a labeled location, though it's discouraged for code readability.
Q.198Medium
Determine the output:
int i = 0;
while (i < 3) {
printf("%d ", i++);
}
Answer: A
i starts at 0. Loop prints i then increments: prints 0, then 1, then 2. When i becomes 3, condition fails.
Q.199Medium
What does this code segment output?
for (int i = 0; i < 5; i++) {
if (i % 2 == 0) continue;
printf("%d ", i);
}
Answer: A
continue skips even numbers. Loop prints only odd values: 1 and 3.
Q.200Easy
Which statement is used to skip remaining iterations and move to next iteration?
Answer: B
continue is the C keyword that jumps to the next iteration of the loop.
