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View Compilation Error

0_0_19216017_17423.cpp: In function 'int main()':
0_0_19216017_17423.cpp:5:29: error: 'scanf' was not declared in this scope
     while(scanf("%d%d",&n,&g)&&n&&g)
                             ^
0_0_19216017_17423.cpp:14:24: error: 'printf' was not declared in this scope
         printf("%d\n",a);
                        ^


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