1.1while
#include<stdio.h>
int main()
{
int i=22;
long s=0;
while(i<=1002)
{
s=s+i;
i=i+20;
}
printf("s=%d\n",s);
return 0;
}
1.2do-while
#include<stdio.h>
int main()
{
int i=22;
long s=0;
do
{
s=s+i;
i=i+20;
}
while(i<=1002);
printf("s=%d\n",s);
return 0;
}
1.3for
#include<stdio.h>
int main()
{
int i;
long s=0;
for(i=22;i<=1002;i=i+20)
s=s+i;
printf("s=%d\n",s);
return 0;
}
2.
#include<stdio.h>
int main()
{
int i=100,a,b,c,t=0;
while(i<=999)
{
a=i%10;
b=(i/10)%10;
c=i/100;
if(i==a*a*a+b*b*b+c*c*c)
{
t++;
printf("%d\n",i);
}
i++;
}
printf("%d\n",t);
return 0;
}
3.
#include<stdio.h>
int main()
{
int i,j,k,n=0;
for(i=1;i<=5;i++)
{
for(j=1;j<=5;j++)
{
for(k=1;k<=5;k++)
{
if(i!=k&&i!=j&&j!=k)
{
printf("%d%d%d\n",i,j,k);
n++;
}
}
}
}
printf("%d\n",n);
return 0;
}