[Solved] How to solve quadratic equations in C, using 3 coefficients?

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You mix 2 things: defining 4 sets and reading them from input (as I understood from your “using scanf“).

(Reading them from input makes no problem as new read values overwrite old.)

Defining 4 sets in advance may be simply done by arrays:

float as[4], bs[4], cs[4];        // as[0], bs[0], cs[0] is the 1st set, etc.
float a    , b    , c    ;

// Assigning values to sets: as[0] = ...; bs[0] = ..., cs[0] = ...;
                             as[1] = ...; bs[1] = ..., cs[1] = ...;
                             ......................................
                             ......................................

//  or initialize them directly in the previous declaration, e.g. 
//                           float as[] = {1,  4, -2,  3},
//                                 bs[] = {0,  5,  1, -1}, 
//                                 cs[] = {2, -4,  1,  2}; 

for (int i; i < 4; ++i)
{
    a = a[i];
    b = b[i];
    c = c[i];
    // Code (or a function call) for computing and printing result(s) from a, b, c
}

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solved How to solve quadratic equations in C, using 3 coefficients?