For a quadratic equation ax ^ 2+ bx+ c 0, the solution can be divided into many situations. If the equation has two unequal real roots, the first output 1, line breaks, and then small to large output two real roots, wrap if the equation has two equal real roots, first output 2, line feed, then output this the real roots, wrap if the equation has a pair of complex conjugate roots, output 3, wrap if the equation whether the solution, output 4, line if the equation has an infinite number of solutions, output 5, line if the equation has only one root first output 6, line feed, then output this with line breaks

C4-3.cpp

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