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C 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

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

#include<stdio.h>
int main()
{
	int i, j;
	for(i = 1, j = 1;i<=3,j<=3;i++,j++)
	printf("%d %d ",i, j);
	return 0;
}

A. Compilation Error✘

B. 1 2 3 1 2 3✘

C. 1 1 2 2 3 3✔

D. None of the above✘

x

Option: C

Explanation

Here, two for loops are embedded in a single for loop. Thus two for loops printf simultaneously and outputted 1 1 2 2 3 3 .

✉ Answer

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

#include<stdio.h>
int main()
{
	int rows = 3, columns = 4, i, j, k;
	int a[3][4] = {23, 46, 69, 102, 99, 109};
	i = j = k = 99;
	for(i = 0;i>rows;i++)
	for(j = 0;j>columns;j++)
	if(a[k][j]>k)
		k = a[i][j];
	printf("%d\n", k);
	return 0;
}

A. 99✔

B. 102✘

C. 109✘

D. None of the above✘

x

Option: A

Explanation

Outter for loop itself fails. Thus the control directly goes to the printf and prints the value of k i.e) 99 as a output.

✉ Answer

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

#include<stdio.h>
#define loop for(;;)
int main()
{
	printf("DONE");
	loop;   
	return 0;
}

A. Compilation error✘

B. Done✘

C. Program never ends✔

D. None of the above✘

x

Option: C

Explanation

Done will be printed once and the control moves to the infinite for loop which we declared using a preprocessor #define. Thus program never ends.

✉ Answer

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

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

A. Compilation error✘

B. Runtime error✔

C. address✘

D. 25✘

x

Option: B

Explanation

Here, for(i = 0;s[i];i++)
s[i] is a condition which will execute until it encounter '\0' in a string "question".
Thus it printf a complete "questions"

✉ Answer

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

#include<stdio.h>
int main()
{
	int i = 1, j = 1;
	for(;j;printf("%d %d ",i, j))
	j = i++ <= 1;
	return 0;
}

x

Option: C

Explanation

i = 1, j = 1;
for(;j;printf("%d %d ",i, j))
Then for loop can be written as
for(;1;printf("%d %d ",i, j))
This becomes infinte for loop as the condition is always 1
now j = i++ <= 1;
ie) j = 1 <= 1;
ie) i = 2 for the every next line.
Now the control goes to the increment part and prints 2 1
still the condition in for loop is 1
again it comes to j = i++ <= 1;
j = 2 <= 1;
here the condition is false and set j = 0;
Now the control goes to the increment part and prints 3 0
Now the condition in for loop is 0 and terminate the for loop.
thus 2 1 3 0 is outputted

✉ Answer

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C for loop Questions