View Compilation Error

0_0_27566929_11986.cpp: In function 'int main()':
0_0_27566929_11986.cpp:5:33: error: expected primary-expression before '?' token
 while(scanf("%d %d",&a,&b)!=EOF)? //根据scanf函数的返回值在while里判断输出格式是否正确看是否进行循环体
                                 ^
0_0_27566929_11986.cpp:6:1: error: expected primary-expression before '{' token
 {
 ^
0_0_27566929_11986.cpp:6:1: error: expected ':' before '{' token
0_0_27566929_11986.cpp:6:1: error: expected primary-expression before '{' token