Why is my .c file not reading my header file?

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C

the 2 errors i get are :
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

header:

#ifndef fraction_h_
#define fraction_h_

struct fraction{
    int wholeNumber;
    int numerator;
    int denominator;
};

struct fraction fractionCreate(int numerator, int denominator);
struct fraction fractionAdd(struct fraction a, struct fraction b);
struct fraction fractionSubtract(struct fraction a, struct fraction b);
struct fraction fractionMultiply(struct fraction a, struct fraction b);
struct fraction fractionDivide(struct fraction a, struct fraction b);
void fractionPrint(struct fraction f);

#endif