天津理工大學(xué)C語言實驗3答案

2/3第一題：#include<stdio.h>#include<math.h>intsushu(inta){intb,c,i=0;b=sqrt(a);for(c=2;c<=b;c++)if(a%c==0)break;if(c>b)return(1);}intjiaohuan(inta){intb;b=a%10*10+(a/10);return(b);}voidmain(){inti;for(i=10;i<=99;i++)if(sushu(i)==1&&sushu(jiaohuan(i))==1)printf("%d\n",i);}第二題：#include<stdio.h>#include<math.h>intsushu(inta){intb,c,i=0;b=sqrt(a);for(c=2;c<=b;c++)if(a%c==0)break;if(c>b)return(1);}intjia2(inta){intb;b=a+2;return(b);}voidmain(){inti;for(i=3;i<=99;i++)if(sushu(i)==1&&sushu(jia2(i))==1)printf("%d/%d\n",i,i+2);}第三題：#include"stdio.h"voidmain(){inthcf(int,int);intlcd(int,int,int);intu,v,h,l;scanf("%d,%d",&u,&v);h=hcf(u,v);printf("H.C.F=%d\n",h);l=lcd(u,v,h);printf("L.C.D=%d\n",l);}inthcf(intu,intv){intt,r; if(v>u) {t=u;u=v;v=t;} while((r=u%v)!=0) {u=v; v=r;} return(v);}intlcd(intu,intv,inth){ return(u*v/h);}第四題：#include<stdio.h>#include<math.h>floatx1,x2,disc,p,q;voidmain(){voidgreater_than_zero(float,float);voidequal_to_zero(float,float);voidsmaller_than_zero(float,float);floata,b,c;printf("\ninputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);printf("equation:%5.2f*x*x+%5.2f*x+%5.2f=0\n",a,b,c);disc=b*b-4*a*c;printf("root:\n");if(disc>0){ greater_than_zero(a,b); printf("x1=%f|t\tx2=%f\n",x1,x2);} equal_to_zero(a,b); printf("x1=%f+%fi\tx2=%f-%fi\n",p,q,p,q);}voidgreater_than_zero(floata,floatb){ x1=(-b+sqrt(disc))/(2*a); x2=(-b-sqrt(disc))/(2*a);}voidequal_to_zero(floata,floatb){ x1=x2=(-b)/(2*a);}voidsmaller_than_zero(floata,floatb){ p=-b/(2*a); q=sqrt(-disc)/(2*a);}第五題：#include<stdio.h>voidmain(){intx,n;floatp(int,int);printf("\ninputn&x:");scanf("%d,%d",&n,&x);printf("n=%d,x=%d\n",n,x);printf("P%d(%d)=%6.2f\n",n,x,p(n,x));}floatp(intn,intx){if(n==0)