C Programming - Declarations and Initializations - Discussion
Discussion Forum : Declarations and Initializations - General Questions (Q.No. 9)
9.
Identify which of the following are declarations
| 1 : | extern int x; |
| 2 : | float square ( float x ) { ... } |
| 3 : | double pow(double, double); |
Answer: Option
Explanation:
extern int x; - is an external variable declaration.
double pow(double, double); - is a function prototype declaration.
Therefore, 1 and 3 are declarations. 2 is definition.
double pow(double, double); - is a function prototype declaration.
Therefore, 1 and 3 are declarations. 2 is definition.
Discussion:
37 comments Page 1 of 4.
Haritha said:
1 decade ago
float square ( float x ) { ... }
Why it is not a declaration?
Why it is not a declaration?
Sundar said:
1 decade ago
Hi Haritha,
It is the actual definition for the function 'square', which may or may not be declared previously.
It is the actual definition for the function 'square', which may or may not be declared previously.
Swathi bhat said:
1 decade ago
What does double pow mean?
Sundar said:
1 decade ago
@Swathi Bhat
double pow(double, double);
It is a function prototype declaration. It should be defined somewhere in the program module. It denotes the following
1. Function name is 'pow'
2. It should called with 2 arguments of type 'double'
3. It will return a double value as result.
If you want to call the function then use the following method:
double Result;
Result = pow(5, 4);
Hope you can understand this. Have a nice day!
double pow(double, double);
It is a function prototype declaration. It should be defined somewhere in the program module. It denotes the following
1. Function name is 'pow'
2. It should called with 2 arguments of type 'double'
3. It will return a double value as result.
If you want to call the function then use the following method:
double Result;
Result = pow(5, 4);
Hope you can understand this. Have a nice day!
Aishu said:
1 decade ago
Can you tel me what is the difference between declaration and definition and state some examples?
Surya said:
1 decade ago
Nice explanation Sundar.
Jaz said:
1 decade ago
int a;
is the declaration, it simply assigns the datatype for the variable.
int a=10; is the definition, it assigns the value for the variable, the value given should match d datatype.
is the declaration, it simply assigns the datatype for the variable.
int a=10; is the definition, it assigns the value for the variable, the value given should match d datatype.
Vivek patel said:
1 decade ago
Thanks to all for a good answers.
Ramarao mundru said:
1 decade ago
Hi,
file f1.c
extern int a;//declaration because it doesn't allocate memory for a variable,it has allocated memory somewhere else in the program
file f2.c
int a;// it is definition because here it is getting memory
a=3;//it is assigment
file f1.c
extern int a;//declaration because it doesn't allocate memory for a variable,it has allocated memory somewhere else in the program
file f2.c
int a;// it is definition because here it is getting memory
a=3;//it is assigment
Naveen goud said:
1 decade ago
@aishu
A declaration is just writing a type of variable or function.
a definition is simply assigning a values to that particular variable or function.
A declaration is just writing a type of variable or function.
a definition is simply assigning a values to that particular variable or function.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers