c = 0；

Scanf("%d ",& flag);

printf(" \ n ")；

if(flag==0||flag== 1)

c = 0；

//Avoid infinite loops here. .....

other

{

c = 1；

Break;

}

//Jump out of the loop when the value of c is 1.

if(c== 1)

{printf("/* Sorry, what you entered does not meet the requirements, \ n ");

Printf ("Please re-enter" 0 "or"1"*/\ n" as required);

}

printf("%d\n "，c)；

printf("%d\n "，flag)；

} while(c = = 1)；