View Compilation Error

0_0_15686301_19090.cpp: In function 'int main()':
0_0_15686301_19090.cpp:4:1: error: expected initializer before 'while'
 while(scanf("%d%d",&a,&b)==2);
 ^
0_0_15686301_19090.cpp:5:21: error: 'b' was not declared in this scope
 printf("%d %d %d",a,b,a+b);
                     ^
0_0_15686301_19090.cpp:7:1: error: expected ';' before '}' token
 }
 ^