1、if-else語句C實現
#include <stdio.h>
/* count digits, white space, others */
main()
{
int c, nwhite, nother;
int ndigit[10];
nwhite = nother = 0;
for(int i = 0; i < 10; ++i)
ndigit[i] = 0;
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 (int i = 0; i < 10; ++i)
printf(" %d", ndigit[i]);
printf(", white space = %d, other = %d\n",nwhite
2、case語句C實現
#include <stdio.h>
int main(void) {
int c, nwhite, nother, ndigit[10]; //nwhite統計空白字符數、nother統計其他字符數、ndigit數組統計1-9數字出現的次數
nwhite = nother = 0;
for (int i = 0; i < 10; i++) //初始化存放統計數字出現次數的數組
ndigit[i] = 0;
while ((c = getchar()) != EOF) {
switch (c) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
ndigit[c-'0']++;
break;
case ' ':
case '\n':
case '\t':
nwhite++;
break;
default:
nother++;
break;
}
}
printf("digits =");
for(i = 0; i < 10; i++)
printf(" %d", ndigit[i]);
printf(", white space = %d, other = %d\n",nwhite, nother);
return 0;
}
程序源碼分別來源於《C語言程序設計》1.6節和3.4節。