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euler.c
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euler.c
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#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <math.h>
#include "libtbl.h"
static void
taylor(libtbl_tbl table)
{
double exp = 0.0;
double x = 1.0;
double eps = 1e-6;
double g = 1.0;
int i = 0;
bool converges = false;
for (;;) {
exp += g;
g = g * x / (double)(++i);
converges = fabs(g) <= eps;
libtbl_tbl_add_row(table,
i,
g,
converges ? LIBTBL_COLOUR_GREEN : LIBTBL_COLOUR_RED,
converges,
exp);
if (fabs(g) <= eps) {
break;
}
}
}
int
main(void)
{
libtbl_tbl table; /* Table printer state */
libtbl_tblcoldef cols[] = { /* Table column definitions */
{ .name = "ITERATION",
.type = LIBTBL_TBLCOLTYPE_INT,
.flags = LIBTBL_TBLCOL_JUSTIFYR },
{ .name = "DIFFERENCE",
.type = LIBTBL_TBLCOLTYPE_DOUBLE,
.flags = LIBTBL_TBLCOL_JUSTIFYR },
{ .name = "CONVERGES",
.type = LIBTBL_TBLCOLTYPE_BOOL,
.flags = LIBTBL_TBLCOL_COLOUREXPL },
{ .name = "EXPONENTIAL",
.type = LIBTBL_TBLCOLTYPE_DOUBLE,
.flags = 0 },
};
/* Init the table printer */
table = libtbl_tbl_begin(cols, sizeof(cols) / sizeof(*cols));
if (!table) {
fprintf(stderr, "error: could not init table\n");
return EXIT_FAILURE;
}
/* Do a calculation */
taylor(table);
/* Dump the table and deallocate the internal allocations */
libtbl_tbl_end(table);
return EXIT_SUCCESS;
}