Loops | C Programming Questions and Answers | C Programming Free Online-Tests | LucentBlackBoard

01.

Consider the following program,
main ()
{
int i, j;
for (i=0, j=5; j >0, i < 10; i ++, j--)
printf("lucentblackboard.com");
}
How many times " lucentblackboard.com " will get printed

A.	5	B.	Compilation Error
C.	10	D.	Compilation Error

Answer and Explanation

Answer: 10

Explanation:
Condition part of for loop ( j>0, i<10 ) is separated by commas which means that compiler will use the value which is at right hand side of comma i.e of i<10 so the loop will execute till the value of i is less than 10.

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02.

How many times the below loop will get executed?
main()
{
int i;
for(i=9;i;i=i-2)
{
printf("\n%d",i);
}
}

A.	5	B.	6
C.	Compilation Error	D.	Infinite

Answer and Explanation

Answer: Infinite

Explanation:
Above loop will iterate till i have non zero value. Initial value of i is 9 and it get decremented by 2 in every iteration ( 9, 7, 5, 3, 1, -1, -3 Ã¢?Â¦.). Value of i will never become 0 and loop will run infinitely.

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03.

How many times the below loop will get executed?
main()
{
int i;
for(i=20, i=10; i<=20; i++)
{
printf("\n %d", i);
}
}

A.	1	B.	Run time Error
C.	11	D.	Compilation Error

Answer and Explanation

Answer: 11

Explanation:
i will start from 10

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04.

How many times the below loop will get executed?
main()
{
int i,j;
i = 10;
for (j=i==10 ; j<=10 ; j++)
{
printf("\n%d",j);
}
}

A.	1	B.	10
C.	11	D.	Compilation Error

Answer and Explanation

Answer: 10

Explanation:
Expression i ==10 return 1 and j get initialized to 1.

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05.

How many times the while loop will get executed?
main ( )
{
int a = 1 ;
while ( a <= 100) ;
{
printf ( "%d", a++ ) ;
}
}

A.	100	B.	1
C.	0	D.	Infinite

Answer and Explanation

Answer: Infinite

Explanation:
Loop will execute infinite no of times because of the ; at the end while loop.

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06.

What is the output of the following code?
#include "stdio.h"
main()
{
int i;
for(i=0;i<5;i++)
{
static int a=0;
int b=0;
a++;
b++;
printf("%d %d",a,b);
}
return 0;
}

A.	1 1 2 1 3 1 4 1 4 1	B.	1 1 2 1 3 1 4 1 5 1
C.	1 0 2 0 3 1 4 1 5 1	D.	0 1 2 0 3 1 4 1 5 1

Answer and Explanation

Answer: 1 1 2 1 3 1 4 1 5 1

Explanation:
There is no explanation...

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07.

What is the output of following program?
void main(){
int a;
a=1;
while(a-->=1)
while(a-->=0);
printf("%d",a);
}

A.	3	B.	-3
C.	0	D.	error

Answer and Explanation

Answer: -3

Explanation:
There is no explanation...

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08.

How many times the while loop will get executed?
main ( )
{
int a = 1 ;
while ( a <= 100) ;
{
printf ( â??%dâ??, a++ ) ;
}
}

A.	100	B.	1
C.	0	D.	Infinite

Answer and Explanation

Answer: Infinite

Explanation:
There is no explanation...

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09.

What is the output of the following program?
void main(){
int a;
a=10;
while(a++<=15)
printf("%d",a);
printf("%d",a+10);
}

A.	10 11 12 13 14 15 16	B.	11 12 13 14 15 16 27
C.	10 11 12 13 14 15 25	D.	11 11 12 13 14 15 25

Answer and Explanation

Answer: 11 12 13 14 15 16 27

Explanation:
There is no explanation...

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10.

What is the output of the following program?
void main(){
int a,b;
a=b=10;
while(a)
{
a=b++<=13;
printf("%d%d",a,b);
}
printf("%d%d",a+10,b+10);
}

A.	1 11 1 12 1 13 1 14 0 15 a=10 b=25	B.	1 11 1 12 1 13 1 14 0 15 a=10 b=25
C.	1 11 1 12 1 13 1 14 0 15 a=11 b=25	D.	0 11 1 12 1 13 1 14 0 15 a=10 b=25

Answer and Explanation

Answer: 1 11 1 12 1 13 1 14 0 15 a=10 b=25

Explanation:
There is no explanation...

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