CareerCup

while( something )
{ putchar('0'); putchar('1'); fflush(stdout); }

? Was it Google Research ?

01010101010101......... This pattern can be printed like this :

do
 {
       printf("01");
 }while(1);

101010101010101010.... This Pattern can be printed like this

do
 {
       printf("10");
 } while(1);

main(){ 
printf("10");  //or printf("01");
main();
}

void fun1()
{
printf("0");
fun2();
}
void fun2()
{
print("1");
fun1();

}

//using xor operator(bitwise operator)
x=0;
while(1)
{
printf("%d",x);
x^=1;
}