C语言程序设计 苏小红版 第五六单元 答案.docx

1、C语言程序设计 苏小红版 第五六单元 答案第五章5.1#includevoid main() double x; printf(请输入一个实数:n); scanf(%lf,&x); if(x0) printf(%fn,x); else printf(%fn,-x); 5.2#include main() int a,b; printf(请输入一个整数:); scanf(%d,&a); b=a%2; if(b=0) printf(%d为偶数n,a); else printf(%d为奇数n,a); 5.3#include#includemain() float a,b,c,s,area; prin

2、tf(请输入三边长:); scanf(%f,%f,%f,&a,&b,&c); s=(a+b+c)/2; area=(float)sqrt(s*(s-a)*(s-b)*(s-c); if(a+bc)&(a+cb)&(b+ca) printf(这个三角形的面积为%fn,area); else printf(这三条边不能组成三角形n); 5.4#include#includevoid main() double a,b,c,d,e,x1,x2; printf(请输入a,b,c:); scanf(%lf,%lf,%lf,&a,&b,&c); if(a=0) printf(该方程不是一元二次方程.n);

3、 else if(b*b-4*a*c0) d=sqrt(b*b-4*a*c); x1=(-b+d)/(2*a); x2=(-b-d)/(2*a); printf(x1=%f,x2=%fn,x1,x2); else if(b*b-4*a*c=0) x1=(-b)/(2*a); printf(x1=x2=%fn,x1); else if(b*b-4*a*c0) printf(该方程没有实数解.n); 5.5#includemain() int year,flag; printf(输入年份:); scanf(%d,&year); if(year%4=0)&(year%100!=0)|(year%40

4、0=0) flag=1; else flag=0; if(flag=1) printf(%d是闰年n,year); else printf(%d不是闰年n,year); 5.6#includevoid main() int year,flag; printf(输入年份:); scanf(%d,&year); flag=(year%4=0)&(year%100!=0)|(year%400=0)?1:2; if(flag=1) printf(%d年是闰年n,year); else printf(%d年不是闰年n,year); 5.7#includemain() char ch; printf(请输

5、入一个字母:); ch=getchar(); if(ch=65)&(ch=97)&(ch=122) ch=ch-32; printf(%c,%dn,ch,ch); else printf(%cn,ch); 5.8#includemain() char ch; printf(请输入一个字符:); ch=getchar(); if(ch=48)&(ch=65)&(ch=97)&(ch=122) printf(这是一个小写字母.n); else if(ch=32) printf(这是一个空格字符.n); else printf(这是一个其它字符.n); 5.9#includemain() int s

6、core,mark; printf(Please enter score:); scanf(%d,&score); if(score100) printf(Input error!n); else if(score=90&score=80&score=70&score=60&score70) printf(%d-Dn,score); else printf(%d-En,score); 5.10#include #include main() int flag, year,month,day,day1=31,day2=30,day3=29,day4=28; printf(请以2012,03这种形

7、式输入某年某月 :); scanf(%d,%d,&year,&month); if (month12|month1) printf(你输入的年份不在合法范围内n); exit(0); else flag=(year%4=0 & year%100 !=0|year% 400 =0)?1:0; switch (flag) case 1: printf(闰年); break; case 0: printf(平年); break; if (month=2&flag=1) day=day3; else if (month=2&flag=0) day=day4; switch (month) case 1

8、: case 3: case 5: case 7: case 8: case 10: case 12: printf(%d年,%d月拥有的天数是31. n,year,month); break; case 4: case 6: case 9: case 11: printf(%d年,%d月拥有的天数是30. n,year,month); break; default: printf(%d年,%d月拥有的天数是%d: n,year,month,day); 本章实验题1#includemain() double faheight,maheight; char sex,sports,diet,F,M

9、,Y,N; printf(请输入父母的身高:n); scanf(%lf,%lf,&faheight,&maheight); printf(请输入孩子是男孩还是女孩(F/M):n); scanf( %c,&sex); printf(请输入孩子是否喜欢锻炼身体(Y/N):n); scanf( %c,&sports); printf(请输入孩子是否有良好的饮食习惯(Y/N):n); scanf( %c,&diet); if(sex=77&sports=89&diet=89) printf(该孩子成人时身高约为:%.2f.n,(faheight+maheight)*0.54*1.02*1.015);

10、else if(sex=77&sports=89&diet=78) printf(该孩子成人时身高约为:%.2f.n,(faheight+maheight)*0.54*1.02); else if(sex=77&sports=78&diet=89) printf(该孩子成人时身高约为:%.2f.n,(faheight+maheight)*0.54*1.015); else if(sex=77&sports=78&diet=78) printf(该孩子成人时身高约为:%.2f.n,(faheight+maheight)*0.54); else if(sex=70&sports=89&diet=8

11、9) printf(该孩子成人时身高约为:%.2f.n,(faheight*0.923+maheight)/2*1.02*1.015); else if(sex=70&sports=89&diet=78) printf(该孩子成人时身高约为:%.2f.n,(faheight*0.923+maheight)/2*1.02); else if(sex=70&sports=78&diet=89) printf(该孩子成人时身高约为:%.2f.n,(faheight*0.923+maheight)/2*1.015); else if(sex=70&sports=78&diet=78) printf(该

12、孩子成人时身高约为:%.2f.n,(faheight*0.923+maheight)/2); 本章实验题2#includemain() double t,w,h; printf(请输入体重身高:n); scanf(%lf,%lf,&w,&h); t=w/(h*h); if(t=18&t=25&t=27) printf(肥胖.n); 第六章6.1(1)#include main() int i,j,k; char space= ; for (i=1;i=4;i+) for (j=1;j=i;j+) printf(%c,space); for (k=1;k=6;k+) printf(*); pri

13、ntf(n); 6.1(2)#include main() int k=4,n; for (n=0;nk;n+) if (n%2=0) continue; k-; printf(k=%dn,n=%dn,k,n);6.1(3)#include main() int k=4,n; for (n = 0;n k;n+) if (n%2 =0) break; k-; printf(k=%d,n=%dn,k,n);6.2(1)#include main() int i,sum = 0; for (i=1;i=101;i=i+2) sum=sum+i; printf(sum = %dn,sum);6.2(

14、2)#include main() long i; long term,sum = 0; for (i=1;i=99;i=i+2) term=i*(i+1)*(i+2); sum=sum+term; printf(sum =%ldn,sum);6.2(3)#include main() long term=0,sum=0; int a,i,n; printf(Input a,n:); scanf(%d,%d,&a,&n); for (i = 1;i=n;i+) term = term * 10 + a; sum=sum+term; printf(sum = %ldn,sum);6.2(4)#i

15、nclude#includemain() int n = 1; float term = 1.0,sign = 1,sum = 0; while (fabs(term) = 1e-4) term = sign / n; sum = sum + term; sign = -sign; n+; printf(sum = %fn);6.2(5)#include#includemain() int n = 1,count = 1; float x; double sum,term; printf(Input x:); scanf(%f,&x); sum = x; term = x; do term =

16、 -term*x*x/(n+1)*(n+2); sum = sum + term; n = n + 2; count+; while (fabs(term)=1e-5); printf(sin(x) = %f,coumt = %d n,sum,count);6.3#includemain() int x=1,find=0; while (!find) if (x%2=1 & x%3=2 & x%5=4 & x%6=5 & x%7=0) find=1; x+; printf(x=%dn,x-1); 6.4#includemain() int i,n; long p,j; printf(Pleas

17、e enter n:); scanf(%d,&n); for (i=1;i=n;i+) p=i*i; j=i*i*i; printf(%d * %d = %ldn,i,i,p); printf(%d * %d * %d= %ldn,i,i,i,j); 6.5#includemain() double C,F,i; for (F = -40;F = 110;F = F + 10) C = (F-32)*5/9; printf(F=%f C=%fn,F,C); 6.6#includemain() double p = 1 + 0.01875*12,x4,x3,x2,benjin; x4 = 100

18、0/p; x3 = (x4 + 1000)/p; x2 = (x3 + 1000)/p; benjin = (x2 + 1000)/p; printf(本金为:%f,benjin);6.7#includemain() double count = 0, c , d , sum = 100; printf(Input c :); scanf(%lf,&c); d = c / 100.0; do sum = sum * (1+d); count+; while (sum = 200); printf(count = %fn,count);6.8#include#includemain() int

19、count = 1; double sum = 1.0 ,term,n = 3.0,i = 1.0; do term = -i/n; sum = sum + term; n = n + 2; i = -i; count+; while (fabs(term) = 1e-5); printf( = %lf,count = %d.n,4 * sum,count);6.9#include #include main() int count = 1; double sum = 1.0 , term = 1.0, n = 1.0; while (fabs(term) = 1e-5) term = ter

20、m / n; sum = sum + term; n+; count+; printf(e = %lf,count = %d.n,sum,count);6.10#include main() int i , a , b , c ,d; for (i = 100 ; i = 999 ; i+) a = i /100; c = i % 10; b = (i - a * 100 - c) / 10; d = a * a * a + b * b * b + c * c * c; if (i = d) printf(i = %dn,i); 6.11#include main() long m = 2 ,

21、 n , term = 1 ,sum = 1; printf(Input n:); scanf(%ld,&n); do term = term * m; sum = sum + term ; m+; while(sum = n); printf(m = %d.n,m - 2);6.12#include main() int num = 1,sum = 0 , count = 0; while (num 0) printf(Input num :); scanf(%d,&num); sum = sum + num ; count+; printf (sum = %d,count = %d.n,s

22、um, count - 1);6.13#include main() int term , sum = 0 , count = 0; do begin: printf(Input term : ); scanf (%d,&term); if (term 0) sum = sum + term ; count+; else if (term 0) goto begin; else goto end ; while (term != 0);end : printf (sum = %d. count = %d.n,sum,count );6.14#include main() int a,b,c;

23、for (a = 0;a 17;a+) for (b = 0;b = 25 ;b+) c = 30 - a - b ; if (a * 3 + b * 2 + c = 50) printf (男 = %d,女 = %d,孩子 = %d.n,a,b,c); 6.15#includemain() int a,b; for (a = 0; a =98 ; a+) b = 98 - a; if (a * 2 + b * 4 = 386) printf (鸡有%d只,免有%d只.n,a,b); 6.16#include main() int x,y,z; for (x = 0;x = 20;x+) for (y = 0;y = 33;y+) z = 100 - x - y; if (5 * x + 3 *y + z / 3.0 = 100) printf