程序

#include<math.h>
main()
{
int i, j;
char s[36][68];
float x = 0.0, h = 3.14159265 / 18;
for (i = 0; i < 36; i++)
{
s[i][0] = '|';
s[i][67] = '\0';
for (j = 1; j < 67; j++)
s[i][j] = ' ';
}
s[22][0] = '+';
for (j = 1; j < 66; j++)
s[22][j] = '-';
s[22][66] = '>';
s[23][66] = 'x';
printf("exp(-x)*cos(x)\n ^\n");
for (j = 0; j < 64; j++)
{
i = (int)(22.5 - 22 * exp(-x / 6.0) * cos(x));
s[i][j] = '*';
x += h;
}
for (i = 0; i < 36; i++)
printf("%s\n", s[i]);
}