第三次上机实验

For 循环
#include<stdio.h>
int main()
{
    int a,b,s;
    for(s=0,a=22;a<=1002;a+=20)
        s+=a;
    printf(" sum s = %d",s);
    return 0;
}
While 循环
#include<stdio.h>
int main()
{
    long int s=0;
    int a=22;
    while(a<=1002)
    {
    s+=a;
    a+=20;
    }
    printf(" sum s = %d",s);
    return 0;
}
Do while 循环
#include<stdio.h>
int main()
{
    long int s=0;
    int a=22;
    do
    {
    s+=a;
    a+=20;
    }
    while(a<=1002);
    printf(" sum s = %d",s);
    return 0;
}

#include<stdio.h>
int main()
{
    int a,i;
    int index=0;
    int ge,shi,bai;
    for(a=100,i=1;a<=999;a++)
    {    
    ge=a%100%10;
    shi=a%100/10;
    bai=a/100;
    if(ge*ge*ge+shi*shi*shi+bai*bai*bai==a)
    {
        printf("%d\n",a);
    index+=1;
    }
    }
    printf(" 总共有水仙花数%d",index);
    return 0;
}

#include<stdio.h>
int main()
{
    int a,b,c;
    int index=0;
    for(a=1;a<=5;a++)
    {
        for(b=1;b<=5;b++)
        {
            if(a==b)
            continue;
        for(c=1;c<=5;c++)
        {
        if(a==b||a==c||b==c)
        {
            continue;
        }
        index+=1;
        printf("%d  \n",a*100+b*10+c);
        }
        }
        }
    printf("总共有%d\n",index);
    return 0;
}