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#include <stdio.h>
/* count digits, white space, others */
main()
{
int c, i, nwhite, nother;
int ndigit[10];
nwhite = nother = 0;
for (i = 0; i < 10; ++i)
ndigit[ i] = 0;[ i]
while ((c = getchar()) != EOF)
if (c >= '0' && c <= '9')
++ndigit[c-'0'];
else if (c == ' ' || c == '\n' || c == '\t')
++nwhite;
else
++nother;
printf("digits =");
for (i = 0; i < 10; ++i)
printf(" %d", ndigit[ i]);[ i]
printf(", white space = %d, other = %d\n",
nwhite, nother);
}
當(dāng)把這段程序本身作為輸入時，輸出結(jié)果為：
digits = 9 3 0 0 0 0 0 0 0 1, white space = 123, other = 345
學(xué)習(xí)中遇到很多問題如圖（做硬件的 剛學(xué)C）
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