Konversi Celcius Ke farenheit dengan fungsi

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

float konversiSuhuCelcius (float celcius,float farenheit);

void main()
{
    system("color E");
    system("cls");
    float celcius,farenheit,rumus;
    printf("------------------------------------\n");
    printf("Masukkan Nilai Derjat Celcius = ");
    scanf("%f",&celcius);

    rumus = konversiSuhuCelcius(celcius,farenheit);
    printf("\nMaka Hasilnya Adalah        = %.2f\n",rumus);
    printf("------------------------------------\n");


 return 0;
}
    float konversiSuhuCelcius(float c,float f)
{
    return (1.8*c)+32;
}