Apr
I need to make a program that doesn't return any values, so I have the ability to only use Pass by value or pass by reference (pointers)between the functions.
I have the ability to get my program to compile, but it doesn't give the right results, and I think I'm doing something wrong. I suspect it has to do with my parameter passing.
I have an input function, a calculation function, a print function, and the normal main function. Since I cannot return any values I'm not sure how to get the data from the input function into my calculation function, without returning values. All of my functions are called from main.
My program is something like this (briefly):
void getNumbers
/* get input of x and y with printfs, scanfs */
void getMod
/* a calculation involving x and y to get mod */
void printMod
/* printing the mod value*/
int main
getNumbers();
getMod(x, y);
printMod(mod);
I think I’m getting confused about how to pass parameters. Could someone please help me out
Answer:
Something like this
void getNumbers (int* x, int* y)
{
/* do whatever gets numbers …. */
*x = 0; /* replace 0 with the number
*y = 0;
}
void getMod (int *mod, int y, int x)
{
*mod = x % y; /* replace with actual calculation */
}
int main ()
{
int x, y, mod;
getNumbers (&x, &y);
getMod (&mod, x, y);
printMod (mod);
}
Basically by putting the ampersand & in front of a variable you take its address. When you use that variable in a function put an asterisk * in front of the variable to mean its value.
In C you would do it a little different
void getNumbers (int& x, int& y)
{
/* do whatever gets numbers …. */
x = 0; /* replace 0 with the number
y = 0;
}
void getMod (int &mod, int y, int x)
{
mod = x % y; /* replace with actual calculation */
}
int main ()
{
int x, y, mod;
getNumbers (x, y);
getMod (mod, x, y);
printMod (mod);
}
Hope that helps
Answer:
decide how you’re planning to pass it
by value ? or by address (reference )
you can use pointers *var to pass by reference,
int *a for pointer variable
so use
void getMod( int *a, int *b)
{
// make calculation now.
}
or else just pass values
void getMod( int a, int b)
{
}
Note, you’ve to define variable out of function to keep it in memory ( remember variable defined within function life cycle is within its existance)
Done ?
Good luck
Answer:
In your main pass in place holder variables to getnumbers to be pointers to the values, then use those to pass the pointers into get mod. Be sure to pass the paramebers by reference and to getNumbers and getMod. Print mod pass by value as you’re not changing the data.
int main
getNumbers(x,y);
getMod(x, y);
printMod(x,y);
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