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

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.
There is no difference between them.
Both can occur multiple times, but a declaration must occur first.

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C Programming
What is the output of given program if user enter "xyz" ?#includevoid main(){float age, AgeInSeconds;int value;printf("Enter your age:");value=scanf("%f", &age);if(value==0){printf("\\nYour age is not valid");}AgeInSeconds = 365 * 24 * 60 * 60 * age;printf("\\n You have lived for %f seconds", AgeInSeconds);}

Complier error
Enter your age : xyz Your age is not valid
Enter your age: xyz Your age is not valid
Enter your age: xyz You have lived for 0 seconds

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