Variable definition and actual initialization

C Programming Language Variable in C Language (Article) Variable in C Language (Program)

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Program:

#include "stdio.h" 
void main() {

   /* variable definition: */
   int a, b;
    
   /* actual initialization */
   a = 10;
   b = 20;  
   printf("value of a : %d \n", a); 
   printf("value of b : %d \n", b);
   
}

Output:

value of a : 10
value of b : 20
Press any key to continue . . .

Explanation:

Question: What is the difference between declaration and definition of a variable?


Answer: Declaration specifies the properties of a variable. For example:



 int x; /* x is an integer */
 int roll_no[]; /* roll_no is an array of integers */


Definition declares a variable and causes the storage to be allocated. For example:


 int x = 10; /* x is declared as an integer and allocated space and initialized to 10 */
 int roll_no[100]; /* roll_no is declared as an array of integers, allocated space for 100 integers */

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