setvbuf(stdout, NULL, _IONBF, 0);
int y0,m0,d0,y1,m1,d1,xage,zage,d;
printf("请输入你的出生年月日");
scanf("%d%d%d",&y0,&m0,&d0);
printf("请输入当前日期");
scanf("%d%d%d",&y1,&m1,&d1);
zage=y1-y0;
xage=y1-y0-1;
d=m1-m0;
if (d>=0)printf("%d",zage);
else printf("%d",xage);
原文：http://www.cnblogs.com/wxh314/p/4914796.html