题解 | #添加逗号#
添加逗号
https://www.nowcoder.com/practice/f51c317e745649c0900996fd3f683aed
#include <stdio.h>
//插入逗号
int main()
{
int n = 0;
int k = 0;
char arr[14] = { 0 };
scanf("%d", &n);
while (n)
{
if (k != 0 && (k + 1) % 4 == 0)//k从零开始,an=4n-1
{
arr[k++] = ',';
}
else
{
arr[k] = n % 10+'0';
k++;
n = n / 10;
}
}
for (k--; k >= 0; k--)//arr[0]也要打印
{
printf("%c", arr[k]);
}
return 0;
}
