I need to know if this can be done, I think with pointers it could be but I do not know what form. On the one hand we have a function cambiarValor
void cambiarValor (int a){
a=a*4;
}
and on the other hand the main from where we invoke it
int main(){
a=4;
cambiarValor(a);
}
What I want to know is so that at the end of main the value of a has changed which pointers I have to use
What I want to know is so that at the end of
mainthe value ofahas changed which pointers I have to use
This, better explained, would look like this:
What I want to know is what do I have to change in my code to change the value of
a
And, indeed, the solution is to use pointers.
To begin with, the cambiarValor function must receive a pointer (this is the only way to get the function to modify a variable outside the function itself):
void cambiarValor (int* a){
*a=(*a)*4;
}
And, finally, we have to modify the main so that the variable does not pass by value but now to cambiarValor we must provide a reference to said variable:
int main(){
a=4;
cambiarValor(&a);
}