fprintf sprintf函數使用示例

//fprintf sprintf函數使用示例
//以指定格式 “年-月-日” 分别寫入檔案和緩沖區

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

int main(int argc,  char *argv[])
{
    int year  = 2020;
    int month = 8;
    int day   =26;
    FILE *fp;
    char buf[64];

   if((fp = fopen("test.txt", "w+")) == NULL)
   {
       perror("fopen");
       return -1;
   }
   
   memset(buf, 0, sizeof(buf));
   fprintf(fp, "%d-%d-%d\n", year, month, day);
   sprintf(buf, "%d-%d-%d\n", year, month, day);
   printf("buf = %s", buf);

   return  0;
 }


           

測試結果