View Compilation Error

0_0_23088063_26933.cpp: In function 'int main()':
0_0_23088063_26933.cpp:3:27: error: 'a' was not declared in this scope
 int main() {scanf("%d%d",&a,&b);printf("%d\n",a+b);}
                           ^
0_0_23088063_26933.cpp:3:30: error: 'b' was not declared in this scope
 int main() {scanf("%d%d",&a,&b);printf("%d\n",a+b);}
                              ^