by Dinesh Thakur Category: Type And Variables

Generally in C program the function definition and calling takes the form as given below:

main()

{
    int x,y,z;
   z=sample(x,y);
    printf("%d",z);
}
sample(x1,y1)
    int x1,y1;
{
    int z1;
   z1= x1 - y1;
    return(z1);
}

 

Here what happens is the values x, y gets passed to x1,y1 and the value z1 is calculated in sample function and the value z1 is returned which is got in z. This value namely z is then printed. Now let us see if the variables are not declared before the braces in the function and if it declared as below:

main()

{
    int x=10;
   int z;
   z=sample(x);
    printf("%d",z);
}
sample(x1)
{
    int x1;
    int z1;
   z1= x1+20;
    return(z1);
}

This would give an error. Surprised!!!!!! Yes because the variable x1 is not declared before the braces of the function and so by default would be assumed to be a integer variable. Again the declaration of integer variable x1 inside the function braces would give an error as Redeclaration of variable x.

About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.



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