#include <string.h>
#include <stdio.h>
int main()
{
char dst[100] = {0};
int a = 10;
char src[] = "hello world";
printf("a=%d,src=%s",a,src);
printf("\n");
int len = sprintf(dst,"a=%d,src=%s",a,src);
printf("dst=\"%s\"\n",dst);
printf("len=%d\n",len);
}