#include "stdio.h"
int main(){
long a,s=0;
for(a=22;a<1003;a=a+20){
s=s+a;}
printf("%ld\n",s);
return 0;
}
#include "stdio.h"
int main(){
long a=22;
long s=0;
while(a<1003){
s=s+a;
a=a+20;
}
printf("%ld\n",s);
return 0;
}
#include "stdio.h"
int main(){
long a=22;
long s=0;
do{
s=s+a;
a=a+20;
}while(a<1003);
printf("%ld\n",s);
return 0;
}
![](https://img2018.cnblogs.com/blog/1619843/201905/1619843-20190506145445364-377870095.png)
![](https://img2018.cnblogs.com/blog/1619843/201905/1619843-20190506145453340-711133375.png)
![](https://img2018.cnblogs.com/blog/1619843/201905/1619843-20190506145503283-1291876413.png)
#include "stdio.h"
#include "math.h"
int main(){
int i,j,k,m,n;
j=0;
for(i=100;i<1000;i++){
k=i/100;
m=(i-100*k)/10;
n=i-100*k-10*m;
if(i==pow(k,3)+pow(m,3)+pow(n,3)){
printf("%d\n",i);
j=j+1;
}
}printf("共有%d个水仙花数。",j);
return 0;
}
![](https://img2018.cnblogs.com/blog/1619843/201905/1619843-20190506145650263-1386862746.png)
#include "stdio.h"
#include "math.h"
int main(){
int i,j,k,m,n;
m=0;
for(i=1;i<6;i++){
for(j=1;j<6;j++){
for(k=1;k<6;k++){
if(i!=j&&j!=k&&k!=i){
n=100*i+10*j+k;
printf("%d\n",n);
m=m+1;
}
}
}
}printf("一共有%d个符合要求的三位数。",m);
return 0;
}
![](https://img2018.cnblogs.com/blog/1619843/201905/1619843-20190506145621158-491132999.png)