Código para Criando bibliotecas em C

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INICIAL.C
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#include <stdio.h>
#include <stdlib.h>

void troca_int( int *valor1, int *valor2);
void troca_float( float *valor1, float *valor2);

int main( void) {
    int int1 = 200, int2 = 100;
    float pf1 = 2.5, pf2 = 1.5;
    troca_int( &int1, &int2);
    troca_float( &pf1, &pf2);
    printf( "Int1: %i, int2: %i, pf1: %f, pf2: %f\n\n", int1, int2, pf1, pf2);
    system( "PAUSE");
    return 0;
}

void troca_int( int *valor1, int *valor2) {
    int temp;
    temp = *valor1;
    *valor1 = *valor2;
    *valor2 = temp;
}

void troca_float( float *valor1, float *valor2) {
    float temp;
    temp = *valor1;
    *valor1 = *valor2;
    *valor2 = temp;
}

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TROCA.C
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#include "troca.h"

void troca_int( int *valor1, int *valor2) {
    int temp;
    temp = *valor1;
    *valor1 = *valor2;
    *valor2 = temp;
}

void troca_float( float *valor1, float *valor2) {
    float temp;
    temp = *valor1;
    *valor1 = *valor2;
    *valor2 = temp;
}


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TROCA.H
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#ifndef TROCA_HEADER_
#define TROCA_HEADER_

void troca_int( int *valor1, int *valor2);
void troca_float( float *valor1, float *valor2);

#endif

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TESTE.C
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#include <stdio.h>
#include <stdlib.h>
#include "troca.h"

int main( void) {
    int int1 = 200, int2 = 100;
    float pf1 = 2.5, pf2 = 1.5;
    troca_int( &int1, &int2);
    troca_float( &pf1, &pf2);
    printf( "Int1: %i, int2: %i, pf1: %f, pf2: %f\n\n", int1, int2, pf1, pf2);
    system( "PAUSE");
    return 0;
}