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View Compilation Error

0_0_22201013_22709.cpp:2:12: error: '::main' must return 'int'
 float main()
            ^
0_0_22201013_22709.cpp: In function 'int main()':
0_0_22201013_22709.cpp:7:14: error: 'scanf' was not declared in this scope
 scanf("%g",&r);
              ^
0_0_22201013_22709.cpp:9:22: error: 'printf' was not declared in this scope
 printf("%g,%3g\n",r,v);
                      ^


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