WAP to suppress not reachable code warning using #pragma directive

WAP to suppress not reachable code warning using #pragma directive
#include<stdio.h>
#include<conio.h>
#pragma warn -rvl
#pragma warn -par
#pragma warn -rch
int f1()
{
int a;
}
void f2(int x)
{
printf("asd");
}
int f3()
{
 int a=1;
 return a;
 a++;
}
int main()
{
 f1();
 f2(2);
 f3();
 getch();
}