【C】#添加逗号#
添加逗号
https://www.nowcoder.com/practice/f51c317e745649c0900996fd3f683aed
#include <stdio.h>
#include <string.h>
int main() {
char arr[20] = {0};
scanf("%s", arr);
int len = strlen(arr);
for (int i = 0; i < len; i++) {
printf("%c", arr[i]);
if ((len - i) % 3 == 1 && i != len - 1)
printf(",");
}
return 0;
}
