Can function return more than one value?

Answer 1

Strictly speaking, only one.

However, a trick many programmers use is to have the function create "side effects" by changing the value of its arguments as well as returning a value. A pseudocode example might be something like a file-existence checker. It would be a boolean function that returns TRUE if the file exists and FALSE if it doesn't. However, depending on the language used it could also modify its arguments so they provided the file's size and record type if it exists. For example: if bFileExists (cFileName, iFileSize, iRecType) then {do something with iFileSize ...}

Answer 2

You can declare a function to accept an arbitrary number of arguments:

int howManyParameters(int parameterCount, ...)

{

va_list ap;

va_start(ap, parameterCount);

printf("Function called with %d parameters:\n", parameterCount);

for(int i = 0; i < parameterCount; i++)

printf(" %d", va_arg(ap, int));

printf('\n');

return n;

}

Answer 3

You can not return multiple values from a function. A function is a routine that takes zero or more arguments and returns no or one value. You could pass one of the arguments by reference (pointer) instead of by value, and alter that object in the caller's address space. This may or may not be desired, based on your criteria for side effects and/or purity. You could also return a class containing more than one value, but at the function interface you are still returning only one value.

Answer 4

A user defined function can "return" a maximum of one value and a minimum of zero value to any caller function. But, by using call by reference, returning multiple values can be simulated, though, no "returning" actually happens.

Answer 5

you cannot return more than one values, instead you have to pass address of a variable to the function, then the function can modify values stores in those address locations.

e.g

#include<stdio.h>

main()

{

int a=5,b=10;

printf("a= %d b=%d \n",a,b);

fun(&a,&b);

printf("a= %d b=%d",a,b);

}

void fun(int *x,int *y)

{

int t=*x;

*x=*y;

*y=t;

}

Answer 6

One. Output parameters can be used to return additional values. You can also return struct or class types to return more than one value via a single value.

Answer 7

One. Of course parameters can be pointers, so value can be passed back with them, for an example see scanf.

Answer 8

Zero or one.

Answer 9

No