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View Compilation Error

0_0_19112343_8238.cpp: In function 'int main()':
0_0_19112343_8238.cpp:4:27: error: 'scanf' was not declared in this scope
  while(scanf("%d %d",&a,&b)!=EOF)
                           ^
0_0_19112343_8238.cpp:4:30: error: 'EOF' was not declared in this scope
  while(scanf("%d %d",&a,&b)!=EOF)
                              ^
0_0_19112343_8238.cpp:13:23: error: 'printf' was not declared in this scope
   printf("%d %d\n",x,y);
                       ^


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