View Compilation Error

0_0_27189626_32103.c: In function 'main':
0_0_27189626_32103.c:4:1: error: expected expression before '?' token
 ?? ?int n,m,i,sum;
 ^
0_0_27189626_32103.c:5:1: error: expected expression before '?' token
 ?? ?while(scanf("%d%d",&n,&m)!=EOF)
 ^