C Programming
What is the difference between a declaration and a definition of a variable?

Both can occur multiple times, but a declaration must occur first.
There is no difference between them.
A definition occurs once, but a declaration may occur many times.
Both can occur multiple times, but a definition must occur first.
A declaration occurs once, but a definition may occur many times.

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C Programming
What is the output of given program if user enter "xyz" ?#includevoid main(){float age, AgeInSeconds;printf("Enter your age:");scanf("%f", &age);AgeInSeconds = 365 * 24 * 60 * 60 * age;printf("You have lived for %f seconds", AgeInSeconds);}

Run time error
Enter your age: xyz You have lived for 0 seconds
Enter your age: xyz "after that program will stop"
Enter your age: xyz You have lived for 0.00000 seconds

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C Programming
Which of the following statements are correct about the program below?#includevoid main(){ int size, i; scanf("%d", &size); int arr[size]; for(i=1; i<=size; i++) { scanf("%d", arr[i]); printf("%d", arr[i]); }}

The code is erroneous since the values of array are getting scanned through the loop.
The code is erroneous since the statement declaring array is invalid.
The code is correct and runs successfully.
The code is erroneous since the subscript for array used in for loop is in the range 1 to size.
None of these

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