20131003国庆作业例4-10,4-11,4-12.

#include<stdio.h>
#include<math.h>
int main(void)
{
int count,i,m,n;

count=0;
for(m=2;m<=100;m++){
n=sqrt(m);
for(i=2;i<=n;i++)
if(m%i==0)
break;
if(i>n){
printf("%6d",m);
count++;

if(count%10==0)
printf("\n");
}
}
printf("\n");

return 0;
}

#include<stdio.h>
int main(void)
{
int i,x1,x2,x;

x1=1;
x2=1;
printf("%6d%6d",x1,x2);
for(i=1;i<=8;i++){
x=x1+x2;
printf("%6d",x);
x1=x2;
x2=x;
}
printf("\n");

return 0;
}

#include<stdio.h>
int main(void)
{
int child,men,women;

for(men=0;men<=45;men++)
for(women=0;women<=45;women++)
for(child=0;child<=45;child++)
if(men+women+child==45&&men*3+women*2+child*0.5==45)
printf("men=%d,women=%d,child=%d\n",men,women,child);

return 0;
}