我想问一下第四题怎么做，那里有错啊？

代码如下：
#include <stdio.h>
int main(void)
{
int a , b , c;
int tmp;
char buf;
printf("请输入三个整数，以空格分隔：\n");
while(1) {
tmp = scanf("%d %d %d" , &a , &b , &c);
if(tmp<3) {
while((buf=getchar())!=EOF && buf!='\n');
fprintf(stderr , "输入的整数格式有误，请重新输入:\n");
continue;
}
break;
}
if(a < b) {
tmp = b;
b = a;
a = tmp;
}
if(a<c) {
tmp = c;
c = a;
a = tmp;
}
if(b<c) {
tmp = c;
c = b;
b = tmp;
}
printf("%d %d %d\n" , a , b , c);
return 0;
}

如果是从小到大顺序输出，那么就改为如下代码：
#include <stdio.h>
int main(void)
{
int a , b , c;
int tmp;
char buf;
printf("请输入三个整数，以空格分隔：\n");
while(1) {
tmp = scanf("%d %d %d" , &a , &b , &c);
if(tmp<3) {
while((buf=getchar())!=EOF && buf!='\n');
fprintf(stderr , "输入的整数格式有误，请重新输入:\n");
continue;
}
break;
}
if(a < b) {
tmp = b;
b = a;
a = tmp;
}
if(a<c) {
tmp = c;
c = a;
a = tmp;
}
if(b<c) {
tmp = c;
c = b;
b = tmp;
}
printf("%d %d %d\n" , c , b , a);
return 0;
}

#include<iostream>
using namespace std;
int main(){
float i[3];
float tmp;
int f=0;
while(f<3){
cin >>i[f];
if(f==0)tmp=i[f];
else if(tmp<i[f]){
tmp=i[f];
int j=f-1;
while(j>=0){
float tmp2;
tmp2=tmp;
if(tmp2>=i[j]){
i[j+1]=i[j];
i[j]=tmp2;
}
j--;
}
}
f++;
}
f=0;
while(f<3){
cout <<i[f]<<" ";
f++;
}cout <<endl;
return 0;
}