输入4个整数，要求按由小到大的顺序输出；

1、         输入4个整数，要求按由小到大的顺序输出；

 #include<stdio.h>
int main()
{
int a,b,c,d,t;
    printf("请输入四个数：\n");
    scanf("%d%d%d%d",&a,&b,&c,&d);
    if(a<b){
     t=a;
        a=b;
        b=t;
        }
     if(a<c)
     {
      t=a;
         a=c;
         c=t;
         }
         if(a<d){
          t=a;
             a=d;
             d=t;
             }
          if(b<c){
           t=b;
              b=c;
              c=t;
              }
           if(b<d){
            t=b;
               b=d;
               d=t;
               }
            if(c<d){
           t=c;
               c=d;
               d=t;
               }
        printf("按小到大排序：%3d%3d%3d%3d\n",d,c,b,a);
        return 0;
}