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View Compilation Error

0_0_32850013_23572.cpp: In function 'int main()':
0_0_32850013_23572.cpp:5:18: error: 'scanf' was not declared in this scope
     scanf("%d",&c);
                  ^
0_0_32850013_23572.cpp:8:34: error: 'sqrt' was not declared in this scope
         printf("%d\n",(int)sqrt(n));
                                  ^
0_0_32850013_23572.cpp:8:35: error: 'printf' was not declared in this scope
         printf("%d\n",(int)sqrt(n));
                                   ^


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