simple math program

math.c

#include "math.h"

float add(float a, float b)
{
    return a + b;
}

float sub(float a, float b)
{
    return a - b;
}

math.h

#ifdef MATH_H
#define MATH_H

// Function prototypes
float add(float a, float b);

float sub(float a, float b);

#endif //MATH_H

program.c

#include <stdio.h>
#include "math.c"

int main(int argc, char const *argv[])
{
    float a = 0.0, b = 0.0;
    
    puts("Ingresa los numeros a sumar");
    scanf("%f %f", &a, &b);
    printf("La suma es: %f\n", add(a, b));
    printf("La resta es: %f\n", sub(a, b));
    return 0;
}