View Compilation Error

0_0_31153986_29761.cpp: In function 'int main()':
0_0_31153986_29761.cpp:4:9: error: expected '(' before '{' token
    while{(scanf("%lld%lld\n",&a,&b)!=EOF)
         ^
0_0_31153986_29761.cpp:4:9: error: expected primary-expression before '{' token
0_0_31153986_29761.cpp:4:9: error: expected ')' before '{' token
0_0_31153986_29761.cpp:5:5: error: expected ';' before 'sum'
     sum=a+b; 
     ^