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/*
-Wall -Wextra -Wpedantic -Wshadow
*/
 
#include <stdio.h>
 
void Fnc1 ( int a )
{
    a++;
}
 
void Fnc2 ( int *a )
{
    (*a)++;
}
 
void Fnc3 ( int &a )
{
    a++;
}
 
 
int main()
{
 
    int a;
 
 
    a = 1;
 
    printf("(1) before: %d\n", a);
 
    Fnc1( a );
 
    printf("(1) after: %d\n", a);
 
/**********/
 
    a = 1;
 
    printf("(2) before: %d\n", a);
 
    Fnc2( &a );
 
    printf("(2) after: %d\n", a);
 
/**********/
 
    a = 1;
 
    printf("(3) before: %d\n", a);
 
    Fnc3( a );
 
    printf("(3) after: %d\n", a);
 
 
    return 0;
}
 
/*
output:
 
(1) before: 1
(1) after: 1
(2) before: 1
(2) after: 2
(3) before: 1
(3) after: 2
 
*/