switch statement based on data type : switch « Operators statements « C++ Tutorial

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2. Operators statements
3. switch

#include <iostream.h>

void increase (void* data, int type)
{
  switch (type)
  {
    case sizeof(char) : (*((char*)data))++; break;
    case sizeof(short): (*((short*)data))++; break;
    case sizeof(long) : (*((long*)data))++; break;
  }
}

int main ()
{
  char a = 5;
  short b = 9;
  long c = 12;
  increase (&a,sizeof(a));
  increase (&b,sizeof(b));
  increase (&c,sizeof(c));
  cout << (int) a << ", " << b << ", " << c;
  return 0;
}

6, 10, 13"