#include <stdio.h>
void f( int a1, int a2, int a3 = 5 ) {
if( ( a3 + a1 ) == 6 ) puts("yes");
else puts("no");
}
int main() {
f( 1, 2, 3 );
f( 1, 2 );
f( 0, 0, 0 );
f( 0, 0 );
f( 1, 2, 5 );
return 0;
}
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