267353_0_6300.cpp: In function `int main()':
267353_0_6300.cpp:6: error: `sqrt' undeclared (first use this function)
267353_0_6300.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
267353_0_6300.cpp:8: error: expected `;' before ')' token
267353_0_6300.cpp:9: error: `flag' undeclared (first use this function)
267353_0_6300.cpp:10: error: expected `;' before ')' token
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