c语言课后作业答案

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1、第3章18041分期还款（第三章第4题）#include#includeintmain(){doubled,p,r;scanf("%lf%lf%lf",&d,&p,&r);if(d==0)printf("0.0");elseif(d*(1+r)-p>d)printf("God");else{printf("%.1f",log10(p/(p-d*r))/log10(1+r));}return0;}第4章18042计算分段函数值（第四章第4题）#include<

2、stdio.h>intmain(){doublex;scanf("%lf",&x);if(x<1)printf("%.2f",x);elseif(x>=1&&x<10)printf("%.2f",2*x-1);elseprintf("%.2f",3*x-11);}18043找出3个数中最大的数（第四章第5题）18044成绩等级评分（第四章第6题）#include#includeintmain(){intscore;scanf("%d",&score);if(scor

3、e>100

4、

5、score<0)printf("error");elseif(score>=90)printf("A");elseif(score>=80)printf("B");elseif(score>=70)printf("C");elseif(score>=60)printf("D");elseprintf("E");return0;}180451803720秒后的时间(第四章第8题)#include#includeintmain(){inth,m,s;s

6、canf("%d:%d:%d",&h,&m,&s);s=s+20;if(s>59){s=s%60;m++;if(m>59){m=m%60;h++;if(h>23)h=0;}}printf("%02d:%02d:%02d",h,m,s);return0;}第5章18046字母分类统计（第五章第2题）#include#includeintmain(){charch;intnL=0,nN=0,nS=0,nO=0;while((ch=getchar())!=''){

7、if(ch>='a'&&ch<='z'

8、

9、ch>='A'&&ch<='Z')nL++;elseif(ch>='0'&&ch<='9')nN++;elseif(ch=='')nS++;elsenO++;}printf("%d%d%d%d",nL,nN,nS,nO);return0;}180471037计算数列和（第五章第4题）#includemain(){inti,n;doublea=2,b=1,s=0;scanf("%d",&n);for(i=1;i<=n;i++){s=s+a

10、/b;a=a+b;b=a-b;}printf("%.4f",s);}18049迭代法求平方根（第五章第6题）#include#includeintmain(){doublea,x0,x1=1;scanf("%lf",&a);do{x0=x1;x1=1.0/2*(x1+a/x1);}while(fabs(x1-x0)>=1e-5);printf("%.4lf",x1);return0;}18050打印三角形（第五章第7题）#include#d

11、efineabs(x)((x)>=0?(x):-(x))intmain(){intn,i,j;scanf("%d",&n);for(i=-(n-1);i<=(n-1);i++){for(j=0;j#includeintmain(){inti,j,k,n;sca

12、nf("%d",&n);for(i=1;i<=n;i++)for(j=i;j<=n;j++){k=(int)sqrt(i*i+j*j);if(k*k==i*i+j*j&&k<=n)printf("%d%d%d",i,j,k);}return0;}第6章18052intn,i;scanf("%d",&n);for(i=14;i>=0;i--)if(a[i]>n)a[i+1]=a[i];elsebreak;a[i+1]=n;1805318054输出不同的数（第六章第3