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C Interview for loop Questions

In most of the MNC interview questions such as in ZOHO interview question, IVTL Infoview interview questions, Amazon interview questions, GOOGLE interview questions, Infosys interview questions and even in Voonik interview questions, We come across several Tricky C Questions about which 2:5 of the questions are from for loop in c. Solving that kind of tricky C questions is not an easy task for all C programmers. We need more practices to solve it with ease. So we provide 25+ interesting C questions in for loop to make your MNC interview very easy.

C for loop Questions

21. What will be the output of the C program?

#include<stdio.h>
int main()
{
	char i = 0;
	for(;i++;printf("%d", i)) ;
	printf("%d",i);
	return 0;
}

A. Compilation error

B. 0

C. 1

D. Program never ends

x

 

Option: C

Explanation

Here, for(; i++; printf("%d", i)) ;
i.e) for(;0;printf("%d", i));//condition fails for the first time itself
thus the loop terminated, but the value of i is incremented to 1.
Now printf("%d",i); printf the value 1 to the output.

Answer


22. What will be the output of the C program, if input is 6?

#include<stdio.h>
int main()
{
	int i = 0;
	for(i = 0;i == 0;i++)
	{
		printf("%d", i);
	}
return 0;
}

A. 0

B. Nothing prints

C. 1

D. None of the above

x

 

Option: A

Explanation

i == 0 condition in for loop is true for one time and its prints the value of i i.e) 0 is outputted.

Answer


23. What will be the output of the C program by considering 'b' as a User input?

#include<stdio.h>
int main()
{
	int i;
	for(i = 0;i<(i++, 5);i++)
		printf("%d ",i);
	return 0;
}

A. 1 3 5

B. 1 2 3 4 5

C. 1 3

D. None of the above

x

 

Option: C

Explanation

Comma operator plays some trick here. lets examine it when using comma opertor in any conditional place right most value willbe consider for checking the condition
for(i = 0;i<(i++, 4);i++)
ie) for(i = 0; i<(0,4); i++)
{
printf("%d", 1);
// prints 1
}
ie) for(i=2; i<(2,4); i++)
{
printf("%d",3);
// prints 3
}
ie) for(i=4; i<(4,4); i++)
//condition fails
Thus 1 3 is outputted

Answer


24. What will be the output of the C program?

#include<stdio.h>
int main()
{
	int i;
	for(i = 0;i<0,5;i++)
		printf("%d\n",i);
	return 0;
}

A. 1 3

B. Program never ends

C. 1 3 5

D. None of the above

x

 

Option: B

Explanation

Here we do not use any brackets in conditional place of for loop, thus compiler will consider that two conditions are given in this place, thus
1. i< 0 // fails for the first iteration itself
1. 5 // which is infinite as 5 neven becomes 0.

Answer


25. What will be the output of the C program?

#include<stdio.h>
int main()
{
	int i, j;
	for(i = 0, j=5;i<j;i++,j--)
		printf("%d %d ",i, j);
	return 0;
}

A. 0 1 2 5 4 3

B. Compilation error

C. 0 5 1 4 2 3

D. Runtime error

x

 

Option: C

Explanation

In this for loop there is two initialization, one condition and 2 incrementation
Thus i prints from 0 and j prints from 5.
With respect to condition 0 5 1 4 2 3 is outputted.

Answer


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