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How do you pass a structure member as a argument to a function?
Wiki User
∙ 14y ago
struct example {
int fld1, fld2;
};
struct example x1;
printf ("fld1=%d, fld2=%d\n", x1.fld1, x1.fld2);
Wiki User
∙ 14y ago
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Can you pass address of the structure member as a function argument?
Yes.
How do you pass a constant to a function argument that only accepts a structure?
Assuming that the argument will only accept a structure, you must place the constant inside of a structure, and use that structure as an argument. If you're using a looser language, you may be able to get away with using a constant in the place of the structure; but either way, that's bad programming practice.
How can a structure be passed as an argument to a function?
A structure is like an array. You can only pass its address. struct _mystruct { int p; ... } mystruct; myfunction (&struct _mystruct mystruct s) { s.p; ... }
How do you pass enum object as argument to function in c?
You can't pass an enum as an argument to a function. An enum in C isn't an object, it's a type. All you can do is pass a variable that is of the particular enum's type.
How would you alter the value stored in the structure member using function?
Pass the structure by reference then dereference the member. typedef struct S { int x; }; void foo (struct S* s) { s->x=42; }
Why you pass arguments to function in c plus plus?
You pass arguments to functions because that is how you tell the function what you want it to do. If you had, for instance, a function that calculated the square root of something, you would pass that something as an argument, such as a = sqrt (b). In this case sqrt is the function name, b is passed as its argument, and the return value is assigned to a.
Pass a structure to functions?
Passing Structure to a function:type specifier function-name (structure-variable);
Which is the syntax used for passing a structure member as an argument to a function?
You can pass the address by using '&' with the pointer variable, while passing actual arguments. In formal arguments '*' is used in the place of '&'. To pass the address of a pointer variable a double pointer variable should be used .
Why it is not possible to pass a function as an argument to another function in c?
It is quite possible. A well-known example is the fourth parameter of qsort.
Can you pass object as an argument to a method?
if you have a function or a method that takes Object as a parameter, you can call that function or method and pass an Object as follows: Let's say you have a class that extends Object and a function as follows public class A extends Object { ..... } void function ( A arg ){ ..... } To call this function, you need an instance of the class A A objectInstance = new A(); function(objectInstance); The next line shows how to pass an instance of the class A to the function.
What does the warning Illegal Argument Exception mean in Java language?
The warning Illegal Argument Exception in Java means that one has attempted to pass a wrong type of argument for a function. For example, we have a function that calculates a sum of two numbers and feed it a text string, which results in Illegal Argument Exception.
What is pass by value in c functions?
Pass by value is a semantic that describes the way in which the actual argument in the calling code is assigned to the corresponding formal argument of the function being called. In pass by value, the actual argument and the corresponding formal argument are independent of each other; changing the value of the formal argument has no effect whatsoever upon the actual argument's value. In other words, the function receives a copy of the actual argument's value, never the actual argument itself. In C, all arguments are passed by value. However, when the formal argument is declared a pointer, we are effectively declaring a pass by reference semantic. The formal and actual arguments are still independent of each other (the formal argument's pointer value can still be changed without affecting the actual argument's pointer value), but if the formal argument and the actual argument both refer to the same object, changing that object's value via the function changes the same value in the caller. Pass by reference is useful when the value being passed is large or complex and cannot be implicitly or easily copied, such as an array or data structure. Pass by reference can also be used to return a value to the caller via an "output parameter", thus allowing a function to return more than one value. [Object-oriented programmers will detest the use of output parameters, citing bad programming practice (or poor style), but in C, it is not only desirable to use them to maintain efficiency, it is largely unavoidable. Object-oriented languages have highly efficient move constructors and move assignment operators, but C does not and copying large structures unnecessarily is detrimental to performance.]
