C语言程序设计苏小红版答案.docx

1、C语言程序设计苏小红版答案main() float x=2.5,y=2.5,z=2.5; printf(x=%fn,x); printf(y=%fn,y); printf(z=%fn,z);3.1(1) #includemain() int a=12,b=3; float x=18.5,y=4.6; printf(%dn,(float)(a*b)/2); printf(%dn,(int)x%(int)y);3.2 #includemain() int x,b0,b1,b2,s; printf(Inputx:); scanf(%d,&x); b2=x/100; b1=(x-b2*100)/10;

2、 b0=x%10; s=b0*100+b1*10+b2; printf(s=%dn,s);3.3 #include#includemain() float rate=0.0225; float n,capital,deposit; printf(Input n,capital:); scanf(%f,%f,&n,&capital); deposit=capital*pow(1+rate,n); printf(deposit=%fn,deposit);3.4 #include#includemain() float a,b,c; double x,y; printf(Inputa,b,c:);

3、scanf(%f,%f,%f,&a,&b,&c); x=(-b+sqrt(b*b-4*a*c)/(2*a); y=(-b-sqrt(b*b-4*a*c)/(2*a); printf(x=%f,y=%fn,x,y);4.1(1) #includemain() char c1=a,c2=b,c3=c; printf(a%cb%cc%cn,c1,c2,c3);4.1(2) #includemain() int a=12,b=15; printf(a=%d%,b=%d%n,a,b);4.1(3) #includemain() int a,b; scanf(%2d%*2s%2d,&a,&b); prin

4、tf(%d,%dn,a,b);4.2 #includemain() long a,b; float x,y; scanf(%d,%dn,&a,&b); scanf(%f,%fn,&x,&y); printf(a=%d,b=%dn,a,b); printf(x=%f,b=%fn,x,y);5.1 #includemain() float a; printf(Innputa:); scanf(%f,&a); if(a=0) a=a; printf(a=%fn,a); else a=-a; printf(a=%fn,a); 5.2 #includemain() int a; printf(Input

5、a:); scanf(%d,&a); if(a%2=0) printf(a是偶数); else printf(a是奇数); 5.3 #include#includemain() float a,b,c,s,area; printf(Inputa,b,c:); scanf(%f,%f,%f,&a,&b,&c); if(a+bc&a+cb&b+ca) s=(a+b+c)/2; area=(float)sqrt(s*(s-a)*(s-b)*(s-c); printf(area=%fn,area); else printf(不是三角形); 5.4 #include#includemain() floa

6、t a,b,c,x,y; printf(Inputa,b,c:); scanf(%f,%f,%f,&a,&b,&c); if(a=0) printf(该方程不是一元二次方程n); if(b*b-4*a*c0) x=(-b+sqrt(b*b-4*a*c)/(2*a); y=(-b-sqrt(b*b-4*a*c)/(2*a); printf(x=%f,y=%fn,x,y); else if(b*b-4*a*c=0) x=-b/(2*a); y=-b/(2*a); printf(x=%f,y=%fn,x,y); else printf(该方程无实根n); 5.5 #includemain() int

7、 year,flag; printf(Input a year:); scanf(%d,&year); if(year%4=0&year%400!=0|year%400=0) flag=1; else flag=0; if(flag=1) printf(%d is a leap year !n,year); else printf(%d is not a leap year !n,year); 5.6 #includemain() int year,flag; printf(Input a year:); scanf(%d,&year); flag=year%400=0|year%4=0&ye

8、ar%100!=01:0; if(flag=1&flag!=0) printf(%d is a leap year !n,year); else printf(%d is not a leap year !n,year); 5.7 #includemain() char ch; printf(Inputch:); scanf(%c,&ch); if(ch=a&ch=A&ch=Z) ch=getchar(); ch=ch+32; printf(%c,%dn,ch,ch); else printf(%c,ch); 5.8 #includemain() char ch; printf(Inputch

9、:); scanf(%c,&ch); if(ch=48&ch=65&ch=97&ch=122) printf(ch是小写字母n); else if(ch=32) printf(ch是空格n); else printf(ch是其他字符n); 5.9 #includemain() int score,grade; printf(Input score:); scanf(%d,&score); grade=score/10; if(score100) printf(Input errorn); if(score=90&score=80&score=70&score=60&score=0&score6

10、0) printf(%d- -En,score); 5.10 #includemain() int year,month; printf(Input year,month:); scanf(%d,%d,&year,&month); if(month12|month=0) printf(error monthn); else switch(year,month) case 12: case 10: case 8: case 7: case 5: case 3: case 1: printf(31天n); break; case 11: case 9: case 6: case 4: printf

11、(30天n); break; case 2: if(year%4=0&year!=0|year%400=0) printf(29天n); else printf(28天n); break; default: printf(Input errorn); 6.1(1) #includemain() 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(*); printf(n); 6.1(2) #includemain() int k=4,n; for(n=

12、0;nk;n+) if(n%2=0) continue; k-; printf(k=%dn,n=%dn,k,n);6.1(3) #includemain() int k=4,n; for(n=0;nk;n+) if(n%2=0) break; k-; printf(k=%d,n=%dn,k,n);6.2(1) #includemain() int i,sum=0; for(i=1;i=101;i+) sum=sum+i; printf(sum=%dn,sum);6.2(2) #includemain() long i; long term,sum=0; for(i=1;i=101;i=i+2)

13、 term=i*(i+1)*(i+2); sum=sum+term; printf(sum=%ldn,sum);6.2(4) #include#includemain() int n=1; float term=1.0,sign=1,sum=0; while(term=1e-4) term=1.0/sign; sum=sum+term; sign=sign+n; n+; printf(sum=%fn,sum);6.2(5) #include#includemain() int n=1,count=1; float x; double sum,term; printf(Input x:); sc

14、anf(%f,&x); sum=x; term=x; do term=-term*x*x/(n+1)*(n+2); sum=sum+term; n=n+2; count+; while(fabs(term)=1e-5); printf(sin(x)=%f,count=%dn,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) printf(x=%dn,x); find=1; x+; /* int x,find=0; for (x=1;!find;x+) if(x

15、%2=1&x%3=2&x%5=4&x%6=5&x%7=0) printf(x=%dn,x); find=1; */6.4 #includemain() int i,n; long p=1,m=1; printf(Input n:); scanf(%d,&n); for(i=1;i=n;i+) p=i*i; m=i*i*i; printf(p=%d,m=%dn,i,p,i,m); 6.5 #includemain() float c,f; for(c=-40;c=110;c=c+10) f=9/5*c+32; printf(f=%fn,f); 6.6 #include#includemain()

16、 int n; double c=0.01875,x; do x=x*pow(1+c,12)-1000; n+; while(x0); printf(x=%dn,x);6.7 #includemain() int n=0; float a=100.0,c; printf(Inputc:); scanf(%f,&c); do a=a*(1+c); n+; while(a=200); printf(n=%dn,n);6.8 #include#includemain() int n=1,count=1; double sum=1,term=1; while(fabs(term)=1e-5) term

17、=pow(-1,count)*(1.0/(n+2); sum=sum+term; n=n+2; count+; sum=4*sum; printf( sum=%f,count=%dn,sum,count);6.9 #include#includemain() int n=1,count=1; double sum=1,term=1; while(fabs(term)=1e-5) term=term*(1.0/n); sum=sum+term; n+; count+; printf(sum=%f,count=%dn,sum,count);6.10 #include#includemain() i

18、nt x; for(x=100;x=999;x+) if(x=pow(x/100,3)+pow(x/10%10,3)+pow(x%10,3) printf(x=%dn,x); 6.11 #includemain() int i=0,n; long sum=0,term=1; printf(Inputn:); scanf(%d,&n); do i+; term=term*i; sum=sum+term; while(sumn); printf(%dn,i-1);6.12 #includemain() int i,n,m,count=0,sum=0; printf(Input n:); scanf

19、(%d,&n); for(i=1;i0) sum=sum+m; count+; else break; printf(sum=%d,count=%dn,sum,count); 6.13 #includemain() int i,n,m,count=0,sum=0; printf(Inputn:); scanf(%d,&n); for(i=1;i0|m0) sum=sum+m; count+; else break; printf(sum=%d,count=%dn,sum,count); 6.14 #includemain() int x,y,z; for(x=0;x=17;x+) for(y=

20、0;y=25;y+) 3*x+2*y+z=50; z=30-x-y; if( 3*x+2*y+z=50&x+y+z=30) printf(x=%d,y=%d,z=%dn,x,y,z); 6.15 #includemain() int x,y; for(x=0;x=98;x+) y=98-x; 2*x+4*y=386; if(x+y=98&2*x+4*y=386) printf(x=%d,y=%dn,x,y); 6.16 #includemain() int x,y,z; for(x=0;x=20;x+) for(y=0;y=33;y+) 3*y+5*x+z/3.0=100; z=100-x-y

21、; if (5*x+3*y+z/3.0=100&z+x+y=100) printf(x=%d,y=%d,z=%dn,x,y,z); 6.17 #includemain() int x,y,z; for(x=1;x=9;x+) for(y=1;y0) printf(x=%d,y=%d,z=%dn,x,y,z); 7.1 #includeint Square(int i) return i*i;int main() int i=0; i=Square(i); for( ;i3;i+) static int i=1; i+=Square(i); printf(%d,i); printf(%dn,i); return 0;7.2 #includeint hour,minute,second;void update() second+; if(second=60) second=0; minute+; if(minute=60) minute=0; hour+; if(hour=24) hour=0;void display() printf(%d,%d,%dn,hour,minute,second);void delay() int t;int main() int i; void updaye(),displ