K-Type thermo-coupled high-precision piecewise linear fitting (C program)

extern float Gettempofvolmi (float V)
{
float k,b;
if (0.03947 <= V < 2.02308)//0~50
{
K = 24.731;
B = 0.1341;
}
else if (2.02308 <= V < 4.09623)//50-100
{
K = 24.075;
B = 1.3446;
}
else if (4.09623 <= V < 6.13834)//100-150
{
K = 24.515;
B =-0.5417;
}
else if (6.13834 <= V < 8.13847)//150-200
{
K = 24.982;
B =-3.3434;
}
else if (8.13847 <= V < 10.15337)//200-250
{
K = 24.824;
B =-1.9926;
}
else if (10.15337 <= V < 12.20857)//250-300
{
K = 24.336;
B = 2.975;
}
else if (12.20857 <= V < 14.29315)//300-350
{
K = 23.97;
B = 7.4128;
}
else if (14.29315 <= V < 16.39714)//350-400
{
K = 23.775;
B = 10.196;
}
else if (16.39714 <= V < 18.51581)//400-450
{
K = 23.59;
B = 13.219;
}
else if (18.51581 <= V < 20.64429)//450-500
{
K = 23.483;
B = 15.19;
}
else if (20.64429 <= V < 22.77643)//500-550
{
K = 23.483;
B = 15.17;
}
else if (22.77643 <= V < 24.90547)//550-600
{
K = 23.474;
B = 15.376;
}
else if (24.90547 <= V < 27.02486)//600-650
{
K = 23.579;
B = 12.729;
}
else if (27.02486 <= V < 29.12897)//650-700
{
K = 23.763;
B = 7.767;
}
else if (29.12897 <= V <31.21345)//700-750
{
K = 23.995;
B = 0.9894;
}
else if (31.21345 <= V <33.27538)//750-800
{
K = 24.258;
B =-7.2115;
}
else if (33.27538 <= V < 35.31311)//800-850
{
K = 24.539;
B =-16.581;
}
else if (35.31311 <= V <37.32592)//850-900
{
K = 24.835;
B =-27.028;
}
else if (37.32592 <= V <39.31353)//900-950
{
K = 25.146;
B =-38.627;
}
else if (39.31353 <= V <41.27561)//950-1000
{
K = 25.476;
B =-51.592;
}
else return-1;
return v*k+b;

}

K-Type thermo-coupled high-precision piecewise linear fitting (C program)