1) You need a semicolon and the end of your prototype:
float xc(float frequency, float capacitance);
2) Variable declarations don’t have “()”
float f;
float c;
3) arguments are separated by commas: capreac = xc(f, c);
4) argument names should match variable names:
float xc(float frequency, float capacitance);
{
float answer;
answer = (1.0/(2.0*pi*capacitance*frequency));
...
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solved How do I fix compiler error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘attribute’ before ‘{‘ token|”?