C语言问题析之 atoi反函数sprintf （十四）

怎样把数字转换为字符串 与 atoi 相反 ？？ 有 itoa 函数吗 ？？

itoa 在 windows 下有，非标准函数库。。

其实我们可以用 sprintf 实现

sprintf (string, "%d", number);

也可以用 sprintf把long型或者浮点型转换为字符串型  %ld %f
所以说 sprintf 是 atoi 的反函数

#include <stdio.h>
#include <stdlib.h> // EXIT_SUCCESS

#define SIZE 1024

int main(int argc, char *argv[])
{
    char str[SIZE];
    int number;

    printf("input the number\n");
    scanf("%d", &number);

#if 1
    if(sprintf(str,"%d",number) == -1)
    {
        perror("failed sprintf\n");
        exit(EXIT_FAILURE);

    }
#endif
    printf("after sprintf str is %s\n\n",str);

    int year;
    int month;
    int day;

    printf("input the year:\n");
    scanf("%d", &year);

    printf("input the month:\n");
    scanf("%d", &month);

    printf("input the day:\n");
    scanf("%d", &day);

    sprintf(str,"year:%d--month:%d--day:%d", year, month, day);
    printf("after sprintf str= %s\n", str);

    exit(EXIT_SUCCESS);
}

ywx@yuweixian:~/yu/c/test$ ./test
input the number
234
after sprintf str is 234

input the year:
2011
input the month:
6
input the day:
5
after sprintf str= year:2011--month:6--day:5