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Is it possible for a function to return more than one value at a time?
Wiki User
∙ 10y ago
No, you can only return one value with a return statement. However, you can return a structure or pointer, so the real answer is yes, though requiring some added complexity.
Wiki User
∙ 13y ago
Wiki User
∙ 10y agoYes, return it as an array or an object.
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Why do you have to use the return type for the main function in c language i mean to what does the main function have to return the value to?
It returns the value to the operating system or whatever process launched it. If you launched your program from a batch file then the batch file can detect this return value. If your program is spawned or launched by another program then the return value goes to that parent prgoram or process. One more thing is that you can write main() without the return type and it will be absolutely correct
What is mean void in c plus plus?
Void means there is no data type. So if you have a void function it does not return a value (and attempting to do so will cause an error) whereas a non-void function (ex. int, long, String, bool, etc) will return a value of that type.
What is Parameter Passing and Returning values.. in Programming.. preferbly Visual Basic?
Parameters are the variables you pass to functions. Return values are the variables that are returned by those functions. Values can also be returned by the parameters themselves (such parameters are said to be output parameters).The variables you pass and return from functions will either be by value or by reference. Only references can be output parameters, since passing by value creates an automatic copy of the value which falls from scope when the function returns. Pointer variables are always passed by value. To pass a reference to a pointer you must pass a pointer to the pointer, which is itself passed by value, but refers to the pointer.Constant references are the preferred method of passing variables to functions, since there is no need to copy the variable you pass and because it is constant, the original value is left unaltered. Non-constant reference is the next best method, but only if you expect changes to be reflected back in your value (an output parameter). If you do not expect changes, then you must pass by value or, when that isn't an option, create a copy of your value and pass by non-constant reference. The only difference is that passing by value automatically destroys the copy when the function returns.Ignoring output parameters, a function can only return, at most, one value. A function that returns void has no return value, however it is good practice to always return something, even if only an integer to indicate whether the function was successful (zero) or not (non-zero). If the function is a logical function, such as Add( X, Y ), or an accessor, such as GetName() then it makes more sense to return the actual result of the function via the return value. If you need more than one return value, then you must use output parameters, passed by reference, which allows the return value to be used as an error indicator.Generally you will want to store the return value of a function, especially if the return value is a memory allocation. If you don't store the return value, the value is lost forever, unless you re-call the function with the same parameters, which is highly inefficient. However, if you only need to know the result of a function once, you don't need to store it, so long as you act upon it immediately, usually as part of a conditional expression. E.g.,int x, y; // Uninitialised, values unknown.if( x + y == 12 ) // call the int::operator+ function.// x+y is definitely 12.else// x+y is definitely not 12, but the actual sum is no longer known at this point.
Why Overloading looks for argument not the return type?
A method's return value can be assigned to a variable:x = myMethod(a, b);or combined in a more complicated expressions:result = a + b + myMethod1(c, d);HOWEVER, it is also possible that the return value is discarded; that is, that the method is invoked, but nothing is done with the return value:myMethod(a, b);In this case, if there are different versions of "myMethod()" that only differ in their return value, the compiler won't know which version to use.
What is the default return type of a function?
The normal exit of program is represented by zero return value. If the code has errors, fault etc., it will be terminated by non-zero value. In C++ language, the main() function can be left without return value. By default, it will return zero. To learn more about data science please visit- Learnbay.co
Why a return function does not return more than one value?
It's by design.
Does a function that takes a value or values and performs an operation return a result to the caller?
Not necessarily. A function that accepts one or more arguments may process those arguments but need not return any value to the caller. In this case the function simply returns void.
Why do you have to use the return type for the main function in c language i mean to what does the main function have to return the value to?
It returns the value to the operating system or whatever process launched it. If you launched your program from a batch file then the batch file can detect this return value. If your program is spawned or launched by another program then the return value goes to that parent prgoram or process. One more thing is that you can write main() without the return type and it will be absolutely correct
What is the use of pointer?
To point with. 1. To manipulate parts of an array. 2. To return more than value from a function.
What is the return type of main?
The normal exit of program is represented by zero return value. If the code has errors, fault etc., it will be terminated by non-zero value. In C++ language, the main() function can be left without return value. By default, it will return zero. To learn more about data science please visit- Learnbay.co
What is the need for return statements in c?
It's not so much a need but a requirement. Every C function must contain at least one return statement, typically at the end of the function body (before the closing brace). However, a C function may have more than one return path, and each requires its own return statement. Note that it does not matter whether the function returns a value or not; even a function that returns void must have a return statement. In C++ the rules regarding return statements are more relaxed. Functions that return void do not require a return statement at all; when execution reaches the closing brace of a void function, a return statement is implied. All functions that return a value of any type other than void must have a return statement. The one exception to this rule is the global main function which must always return an int. If the global main function has no return statement then the value 0 is implicitly returned to the calling environment (the value 0 is typically used to indicate no error). However, if we need to return other values (including 0), then we must include a return statement. Functions that have multiple return paths are considered poor style and should be avoided. Functions are generally much easier to read and maintain when there is only one return path which should logically terminate at the very end of the function. However, eliminating multiple return paths can also produce more efficient machine code, particularly in functions with highly complex return paths. Eliminating multiple return paths needn't be difficult, we simply need to refactor the function such that each unique return path is representing by some function which returns the appropriate value. The calling function simply stores that value and returns it at the end of the function, thus simplifying the overall complexity of the calling function. Refactoring complex functions into smaller, simpler function calls is good style in and of itself; well-named, descriptive function calls result in code that is largely self-documenting and thus more abstract. Although function calls are themselves expensive, small and simple functions can be easily inline-expanded by the compiler's optimisers, so it's a win-win.
Difference between sql function and sql procedure?
Function is must be return the value but procedure cannot be returned, for more information please visit the link : http://youropensource.com
What is mean void in c plus plus?
Void means there is no data type. So if you have a void function it does not return a value (and attempting to do so will cause an error) whereas a non-void function (ex. int, long, String, bool, etc) will return a value of that type.
What is Parameter Passing and Returning values.. in Programming.. preferbly Visual Basic?
Parameters are the variables you pass to functions. Return values are the variables that are returned by those functions. Values can also be returned by the parameters themselves (such parameters are said to be output parameters).The variables you pass and return from functions will either be by value or by reference. Only references can be output parameters, since passing by value creates an automatic copy of the value which falls from scope when the function returns. Pointer variables are always passed by value. To pass a reference to a pointer you must pass a pointer to the pointer, which is itself passed by value, but refers to the pointer.Constant references are the preferred method of passing variables to functions, since there is no need to copy the variable you pass and because it is constant, the original value is left unaltered. Non-constant reference is the next best method, but only if you expect changes to be reflected back in your value (an output parameter). If you do not expect changes, then you must pass by value or, when that isn't an option, create a copy of your value and pass by non-constant reference. The only difference is that passing by value automatically destroys the copy when the function returns.Ignoring output parameters, a function can only return, at most, one value. A function that returns void has no return value, however it is good practice to always return something, even if only an integer to indicate whether the function was successful (zero) or not (non-zero). If the function is a logical function, such as Add( X, Y ), or an accessor, such as GetName() then it makes more sense to return the actual result of the function via the return value. If you need more than one return value, then you must use output parameters, passed by reference, which allows the return value to be used as an error indicator.Generally you will want to store the return value of a function, especially if the return value is a memory allocation. If you don't store the return value, the value is lost forever, unless you re-call the function with the same parameters, which is highly inefficient. However, if you only need to know the result of a function once, you don't need to store it, so long as you act upon it immediately, usually as part of a conditional expression. E.g.,int x, y; // Uninitialised, values unknown.if( x + y == 12 ) // call the int::operator+ function.// x+y is definitely 12.else// x+y is definitely not 12, but the actual sum is no longer known at this point.
What is a function in C programming language?
A function is a subroutine that can be called from several places (re-usable code). Functions can accept arguments (or parameters) so that they can be more generalised and can also return a value to the caller.
Why Overloading looks for argument not the return type?
A method's return value can be assigned to a variable:x = myMethod(a, b);or combined in a more complicated expressions:result = a + b + myMethod1(c, d);HOWEVER, it is also possible that the return value is discarded; that is, that the method is invoked, but nothing is done with the return value:myMethod(a, b);In this case, if there are different versions of "myMethod()" that only differ in their return value, the compiler won't know which version to use.
What is the definition for call by value in c language?
A function is called within a function either called by value or called by reference.When a function is called by passing the values of one or more variables,then the value is copied to a new var of the function's own var of its scope.Ex:void main(){...........c=fun(a,b);...}fun(int c,int d){ int t;t=c+d;return(t);}
