上机测试题ppt课件.ppt

,求相应的y值。(分段函数)#include<>main(){floatx,y;scanf(“%f”,&x);if(x<1)y=x;elseif(x<10)y=2*x-1;elsey=3*x-11;printf(“y=%f”,y);}。(不考虑a!=0和有复根情况)#include<>#include<>main(){floata,b,c,d,x1,x2;   scanf("%f%f%f",&a,&b,&c);   d=sqrt(b*b-4*a*c);          x1=(-b+d)/(2*a);   x2=(-b-d)/(2*a);   printf("x1=%,x2=%\n",x1,x2);},输出其中最大的数。#include<>main(){inta,b,c,max;  scanf("%d%d%d",&a,&d,&c);  max=a;  if(max<b)max=b;  if(max<c)max=c;  printf("max=%d\n",max);}#include<>main(){inti,n,s=0scanf(“%d”,&n);for(i=1;i<=n;i++)s=s+i;printf(“%d”,s);}=1+2+3+……+n#include<>main(){inti,n;doubles=1;scanf(“%d”,&n);for(i=1;i<=n;i++)s=s*i;printf(“s=%f”,s);}=n!。#include<>main(){inti,n;doublep=1,s=0;scanf(“%d”,&n);for(i=1;i<=n;i++){p=p*i;s=s+p;}printf(“s=%f”,s);}=1!+2!+3!+……+n!#include<>main(){inti,j;   for(i=1;i<10;i++)      {j=i*10+6;       if(j%3!=0)countinue;       printf("%5d",j);       }}(不含100)能被3整除且个位数为6的所有整数。#include<>main(){intn;floatsum=0;  for(n=1;;n++) {sum=sum+;if(sum>10)break;}  printf("n=%d\n",n);}。#include<>main(){inti,m,n=0;   for(m=201;m<300;m=m+2)    {if(n%10==0)printf("\n");      for(i=2;i<m;i++) if(m%i==0)break;      if(i>=m){printf("%5d",m);n++;}}}~200间的全部素数。#include<>main(){intf1,f2,f3,i;f1=0;f2=1;printf(“%10d%10d”,f1,f2);for(i=3;i<=20;i++){f3=f1+f2;printf("%10d",f3);if(i%5==0)printf("\n");f1=f2;f2=f3;}}。