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Run the following C++ program with and without preprocessor variable POSTFIX defined.
#include
using namespace std;
extern "C" int atoi( const char *str );
struct Node {
int i, j, k;
Node() {}
};
int main( int argc, char *argv[ ] ) {
int times = 10000;
switch ( argc ) {
case 2:
times = atoi( argv[1] );
} // switch
vector v( 10000 );
vector::iterator vi;
volatile int j = 0; // ignore, prevent loop elimination
for ( int i = 0; i < times; i += 1 ) {
for ( vi = v.begin(); vi != v.end();
#ifdef POSTFIX
vi ++
#else
++ vi
#endif
) {
j += 1; // ignore, prevent loop elimination
}
what is history of c language
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