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NTT Data Iteration, Recursion, Decision Quiz-1

Question 1

Time: 00:00:00

Which loop is especially useful when you process a menu selection?

while

do-while

for

switch

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Ans: do-while

Explanation:

do-while is especially useful when one processes a menu selection.

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Question 2

Time: 00:00:00

What will be the output of the following code?

#include<stdio.h>

int main()

{

  int j=50;

  while(true)

  {

    if(j<10)

      break;

    j=j-10;

  }

  printf("j is %d", j);

}

Error

No output

j is 0

j is 50

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Answer: j is 0

Explanation:

First j=50. So, we will enter inside the while loop. J is not less than 10 hence j=j-10=40. Again we will check the while condition and we will enter inside the while loop. Now again since j is not less than 10 hence j=j-10=30. Similarly j=20,j=10. When j=10 we will check if the condition is false so we will do j=j-10. Hence j=0. Now we will check the condition and it will become true, so we will come out of the while loop. And we will print the value of j which is zero( 0).

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Question 3

Time: 00:00:00

In the while and do-while loops, Which statement causes control to be transferred directly to the conditional expression that controls the loop?

break

pause

start

continue

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Answer: continue

Explanation:

"continue" is used to go to the next iteration of the loop.

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Question 4

Time: 00:00:00

How many times below for loop will be executed ?

#include<stdio.h>

int main()

{

    int i=0;

    for(;;)

        printf("%d",i);

    return 0;

}

1 time

0 time

10 times

Infinite times

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Answer: Infinite times

Explanation:

for loop will execute infinite times as there is no condition given.

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Question 5

Time: 00:00:00

Find the output of the following program.

#include<stdio.h>

int main()

{

    char str[] = "Smaller";

    int a = 100;

    printf(a > 10 ? "Greater" : "%s", str);

    return 0;

}

Compilation Error

Greater

Smaller

100

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Ans: Greater

Explanation:

(condition)? a:b

? operator will check the condition before it if it is true then it will print a otherwise b.

Hence, here a is greater than b then, "Greater" will get printed.

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Question 6

Time: 00:00:00

Time Complexity of this program:

def f():

ans = 0

for i = 1 to n:

for j = 1 to log(i):

ans += 1

print(ans)

O(n)

O(nlogn)

O(n2)

O(n3)

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Ans: O(nlog(n))

Explanation:

The first for loop will run till n times. The second will run till log(i) times, i will run till n times. Hence complexity will be O(nlog(n)).

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Question 7

Time: 00:00:00

How many times will this loop execute?

#include<stdio.h>

int main()

{

int i;

for(i=0;i<10;i++)

{

printf("%d\n",i++);

i=++i;

}

return 0;

}

None of the above

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Ans: 4

Explanation:

The loop will ruin four times and give the below output:

0

3

6

9

So, the loop will run 4 times.

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Question 8

Time: 00:00:00

How many times will this loop execute?

#include<stdio.h>

int main()

{

int i=1;

for(;i<10;i=i/i)

{

printf("%d\n",i);

}

return 0;

}

Infinite times

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Ans:

Explanation:

We have i=1, we will print that for the next iteration i=1/1=1. Every time we are dividing i by i and i will remain 1. Hence we will get into an infinite loop.

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Question 9

Time: 00:00:00

How many times will this loop execute?

#include<stdio.h>

int main()

{

int max = 5;

int i = 0;

for(;;)

{

i++;

if(i> max)

break;

printf("i = %d\n",i);

}

return 0;

}

None of the above

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Answer: 5

Explanation:

First iteration:

i++ => i=1

if (i>max) => if(1>5), false so print i

1 gets printed

Second iteration:

i++ => i=2

if (i>max) => if(2>5), false so print i

2 gets printed

Third iteration:

i++ => i=3

if (i>max) => if(3>5), false so print i

3 gets printed

Fourth iteration:

i++ => i=4

if (i>max) => if(4>5), false so print i

4 gets printed

Fifth iteration:

i++ => i=5

if (i>max) => if(5>5), false so print i

5 gets printed

Sixth iteration:

i++ => i=6

if (i>max) => if(6>5), true

Hence we will come out of for loop.

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Question 10

Time: 00:00:00

What will be the output?

#include<stdio.h>

int main()

{

int max = 5;

int c = 0;

for(; c <max;c++);

{

printf("%d ",c);

}

printf("END\n");

return 0;

}

0 1 2 3 4 End

1 2 3 4 5 End

5 End

Error

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Answer: 5 END

Explanation:

The program initializes two variables max and c to 5 and 0, respectively. It then enters a for-loop that runs while c is less than max. However, due to a semicolon placed after the loop, the loop body is empty, and the loop executes without any actions. After the loop, it prints the value of c (which is now 5) and "END" to the console. So, the output of the program is 5 END.

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