C語言一題問 - Ans.fyi 參考答案

C語言一題問

[匿名]

2009-04-14 6:05 am

strtok 的使用
•使用gets讓使用者輸入一字串
•使用strtok切割使用者輸入字串為個別token
•將這些token用printf分列輸出。輸出時所有token靠右對齊長度最長的token

EX:
輸入:This is a test string.
輸出:
-This
----is
-----a
--test
string.
(減號是空白鍵的意思)

回答 (1)

bean_bottom_2

2009-04-14 7:44 am

✔ 最佳答案

#include <stdio.h>
#include <string.h>

int main()
{
char str[256];
char tmp[256];
char *ptr;
char ch;
int i,j;

printf("Please enter a sentence.\n");
if (gets(str) == NULL) {
printf("error in reading from gets\n");
exit(1);
}

strcpy(tmp,str);
ptr = strtok(tmp," ");
i = 0;

while (ptr != NULL) {
if ( strlen(ptr) > i ) {
i = strlen(ptr);
}
ptr = strtok(NULL," ");
}

strcpy(tmp,str);
ptr = strtok(tmp," ");

while (ptr != NULL) {
j = strlen(ptr);
while (j < i) {
printf(" ");
j++;
}
printf("%s\n",ptr);
ptr = strtok(NULL," ");
}

}

// Not optimal but works.

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