C Programming - Control Instructions - Discussion
Discussion Forum : Control Instructions - Point Out Correct Statements (Q.No. 2)
2.
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("IndiaBIX\n");
return 0;
}
Answer: Option
Explanation:
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).
Discussion:
20 comments Page 1 of 2.
Cynthia Newton said:
1 decade ago
Equality can be checked with == symbol .
The condition should be - if(i%2 == j%3) , where even then it will be a error due to the lack of value for j.
Hence it is an Expression syntax (option A).
The condition should be - if(i%2 == j%3) , where even then it will be a error due to the lack of value for j.
Hence it is an Expression syntax (option A).
Sundar said:
1 decade ago
@Cynthia Newton
You are wrong. The given answer is correct only.
Because we can use '=' and '==' in if conditions.
Eg: The followings are valid if conditions.
1. if(0 == 0) // true
2. if(1 == 2) // false
3. if(i = 0) // false
4. if(i = 1) // true
Eg: Some invalid if conditions.
5. if(0 = 0) // Invalid. LValue required
6. if(1 = 2) // Invalid. LValue required
But, the actual reason for the error "LValue required error" is due to the following reason:
The assignment operator '=' always requires an operand immediate left.
LValue --> LEFT side operand required.
In the above 4 examples, 3 and 4 uses an operand immediate LEFT side to the '=' operator. So, it is a valid statement. But in the case 5 and 6 it fails due to 'LValue required'.
I hope this may help you. Have a nice day!
You are wrong. The given answer is correct only.
Because we can use '=' and '==' in if conditions.
Eg: The followings are valid if conditions.
1. if(0 == 0) // true
2. if(1 == 2) // false
3. if(i = 0) // false
4. if(i = 1) // true
Eg: Some invalid if conditions.
5. if(0 = 0) // Invalid. LValue required
6. if(1 = 2) // Invalid. LValue required
But, the actual reason for the error "LValue required error" is due to the following reason:
The assignment operator '=' always requires an operand immediate left.
LValue --> LEFT side operand required.
In the above 4 examples, 3 and 4 uses an operand immediate LEFT side to the '=' operator. So, it is a valid statement. But in the case 5 and 6 it fails due to 'LValue required'.
I hope this may help you. Have a nice day!
(1)
Ravindar said:
1 decade ago
I can't understand your explanation. Please clearly explanation. Lvalue means?
Rajat Rahul said:
1 decade ago
@Ravinder: In 5 and 6 there are no any identifier immediet to the left which should be mendatory to have the result of that expression.
Keerthi kumar said:
1 decade ago
@sundar ...thanks..
Praveen said:
1 decade ago
@Sundar.. Good explanation :)
Siva said:
1 decade ago
I can't understand I want clear explanation. Why we use L value.
Priyanka.s said:
1 decade ago
@sundar good explanation thank you.
Priyanka.s said:
1 decade ago
Can any one explain what is meant by Rvalue?
Vinita Jain said:
1 decade ago
I want to know what is Rvalue. Please explain.
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