File, example

#include <stdio.h>

#include <math.h>

main()

{

float mc, ph;

FILE *fin, *fout;

fin = fopen("ph.in", "r");

fout = fopen("ph.out", "w");

while( fscanf(fin, "%f", &mc) != EOF ) {

ph = - log10(mc);

fprintf(fout, "\nMolar"

"concentration = %e\n", mc);

fprintf(fout, "pH = %f\n", ph);

if (ph < 7.0)

fprintf(fout, "Acidic\n");

else

fprintf(fout, "Nonacidic\n");

}

}

This is program pg64.c.

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