Questions and answers for exam Preparation

MCQs

Total Questions : 30 | Page 2 of 3 pages

Question 11.

Which of the following sentences are correct about a for loop in a C program?

1: for loop works faster than a while loop.

2: All things that can be done using a for loop can also be done using a while loop.

3: for(;;); implements an infinite loop.

4:for loop can be used if we want statements in a loop get executed at least once.

1
1, 2
2, 3
2, 3, 4

Discuss Question

Answer: Option D. -> 2, 3, 4

Question 12.

Which of the following statements are correct about the program?

#include<stdio.h>
int main()
{
int x = 30, y = 40;
if(x== y)
printf("x is equal to y\n");
else if (x > y)
printf("x is greater than y\n");
else if (x > y)
printf("x is less than y\n")
return 0;
}

Error: Statement missing
Error: Expression syntax
Error: Lvalue required
Error: Rvalue required

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Answer: Option A. -> Error: Statement missing

This program will result in error "Statement missing ;"

printf("x is less than y`setminus`n") here ; should be added to the end of this statement.

Question 13.

Which of the following statements are correct about the below C-program?

#include<stdio.h>
int main()
{
int x = 10, y = 100%90, i,
for(i = 1; i

1
2, 3
3, 4
4

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Answer: Option B. -> 2, 3

Question 14.

Which of the following statements are correct about the below program?

#include<stdio.h>
int main()
{
int i = 0;
i++;
if(i

The program prints 'Placementadda' 5 times
The program prints 'Placementadda' one time
The call to main() after exit() doesn't materialize.
The compiler reports an error since main() cannot call itself

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Answer: Option B. -> The program prints 'Placementadda' one time

Step 1: int i = 0; here variable i is declared as an integer type and initialized to '0'(zero).
Step 2: i++; here variable i is increemented by 1(one). Hence, i = 1
Step 3: if(i <= 5) becomes if(1 <= 5) here we are checking '1' is less than or equal to '5'.

Hence the if condition is satisfied.
Step 4: printf("Placementadda`setminus`n"); It prints "Placementadda"
Step 5: exit(); terminates the program execution.

Hence the output is "Placementadda".

Question 15.

Which of the following statements are correct about an if-else statements in a C-program?

1: Every if-else statement can be replaced by an equivalent statements using ?: operators

2: Nested if-else statements are allowed.

3: Multiple statements in an if block are allowed.

4: Multiple statements in an else block are allowed.

1 and 2
2 and 3
1, 2 and 4
2, 3, 4

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Answer: Option D. -> 2, 3, 4

No answer description available for this question.

Question 16.

Which of the following statements are correct about the below program?

#include<stdio.h>
int main()
{
int i = 10, j = 15;
if(i % 2 = j %3)
printf("Placementadda\n");
return 0;
}

Error: Expression syntax
Error: Lvalue required
Error: Rvalue required
The Code runs successfully

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Answer: Option B. -> Error: Lvalue required

if(i % 2 = j % 3) This statement generates "LValue required error".

There is no variable on the left side of the expression to assign (j % 3).

Question 17.

Point out the error, if any in the program.

#include<stdio.h>
int main()
{
int i = 1;
switch(i)
{
case 1:
printf("Case1");
break;
case 1*2+4:
printf("Case2");
break;
}
return 0;
}

Error: in case 1*2+4 statement
Error: No default specified
Error: in switch statement
No Error

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Answer: Option D. -> No Error

Constant expression are accepted in switch

It prints "Case1"

Question 18.

Point out the error, if any in the program.

#include<stdio.h>
int main()
{
int a = 10, b;
a >=5 ? b=100: b=200;
printf("%d\n", b);
return 0;
}

100
200
Error: L value required for b
Garbage value

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Answer: Option C. -> Error: L value required for b

Variable b is not assigned.

It should be like:
b = a >= 5 ? 100 : 200;

Question 19.

Which of the following statements are correct about the below program?

#include<stdio.h>
int main()
{
int i = 10, j = 20;
if(i = 5) && if(j = 10)
printf("Have a nice day");
retrurn 0;
}

Output: Have a nice day
No output
Error: Expression syntax
Error: Undeclared identifier if

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Answer: Option C. -> Error: Expression syntax

"Expression syntax" error occur in this line if(i = 5) && if(j = 10).

It should be like if((i == 5) && (j == 10)).

Question 20.

Point out the error, if any in the program.

#include<stdio.h>
int main()
{
int P = 10;
switch(P)
{
case 10:
printf("Case 1");
case 20:
printf("Case 2");
break;
case P:
printf("Case 2");
break;
}
return 0;
}

Error: No default value is specified
Error: Constant expression required at line case P:
Error: There is no break statement in each case.
No error will be reported

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Answer: Option B. -> Error: Constant expression required at line case P:

The compiler will report the error "Constant expression required" in the line

case P: . Because, variable names cannot be used with case statements.

The case statements will accept only constant expression.