C语言程序习题答案.doc

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1、C语言程序习题答案例1.1：/* Note:Your choice is C IDE */#include stdio.hvoid main()printf(This is a C program.n);return 0;例1.2：/* Note:Your choice is C IDE */#include stdio.hvoid main()char a,b,sum;a=123;b=456;sum=a+b;printf(sum is %cn,sum);return 0;例1.3：/* Note:Your choice is C IDE */#include stdio.h/主函数int m

2、ain()int max(int x,int y);int a,b,c;scanf(max=%d,%d,&a,&b);c=max(a,b);printf(max=%dn,c);return 0;/求两个整数中的较大者的max函数int max(int x,int y);int z;if(xy)z=x;else z=y;return(Z);例3.1：/* Note:Your choice is C IDE */#include stdio.hvoid main()float f,c;f=64.0;c=(5.0/9)*(f-32);printf(f%fnc%fn,f,c);return 0;例3.

3、2：/* Note:Your choice is C IDE */#include stdio.hvoid main()float p0=1000,r1=0.0036,r2=0.0225,r3=0.0198,p1,p2,p3;p1=p0*(1+r1);p2=p0*(1+r2);p3=p0*(1+r3/2)*(1+r3/2);printf(p1=%fnp2=%fnp3=%fn,p1,p2,p3);return 0;例3.3：/* Note:Your choice is C IDE */#include stdio.hvoid main()char c1,c2;c1=A;c2=c1+32;prin

4、tf(%cn,c2);printf(%dn,c2);return 0;例3.4：/* Note:Your choice is C IDE */#include stdio.h#include math.hvoid main()double a,b,c,s,area;a=3.67;b=5.43;c=6.21;s=(a+b+c)/2;area=sqrt(s*(s-a)*(s-b)*(s-c);printf(a=%ftb=%ftc=%fn,a,b,c);printf(area=%fn,area);return 0;例3.5：/* Note:Your choice is C IDE */#includ

5、e stdio.h#includemath.hvoid main()double a,b,c,disc,x1,x2,p,q;scanf(%lf%lf%lf,&a,&b,&c);disc=b*b-4*a*c;p=-b/(2.0*a);q=sqrt(disc)/(2.0*a);x1=p+q;x2=p-q;printf(x1=%7.2fnx2=%7.2fn,x1,x2);return 0;例3.6：/* Note:Your choice is C IDE */#include stdio.hvoid main()double a=1.0;printf(%10.15fn,a/3);return 0;例

6、3.7:/* Note:Your choice is C IDE */#include stdio.hvoid main()float a;a=10000/3.0;printf(%fn,a);return 0;例3.8：/* Note:Your choice is C IDE */#include stdio.hvoid main()char a=B,b=O,c=Y;putchar(a);putchar(b);putchar(c);putchar(n);return ;例3.9：/* Note:Your choice is C IDE */#include stdio.hvoid main()

7、char a,b,c;a=getchar();b=getchar();c=getchar();putchar(a);putchar(b);putchar(c);putchar(n);return 0；例3.10：/* Note:Your choice is C IDE */#include stdio.hvoid main()char c1,c2;c1=getchar();c2=c1+32;putchar(c2);return 0;例4.1：/* Note:Your choice is C IDE */#include stdio.h#include math.hvoid main()doub

8、le a,b,c,disc,x1,x2,p,q;scanf(%lf%lf%lf,&a,&b,&c);disc=b*b-4*a*c;if(discb)t=a;a=b;b=t;printf(%5.2f,%5.2fn,a,b);return 0;例4.3：/* Note:Your choice is C IDE */#include stdio.hvoid main()float a,b,c,t;scanf(%f,%f,%f,&a,&b,&c);if(ab)t=a;a=b;b=t;if(ac)t=a;a=c;c=t;if(bc)t=b;b=c;c=t;printf(%5.2f,%5.2f,%5.2f

9、n,a,b,c);return 0;例4.4：/* Note:Your choice is C IDE */#include stdio.hvoid main()char ch;scanf(%c,&ch);ch=(ch=A&ch=0);if(x0)y=1;elsey=0;elsey=-1;printf(x=%d,y=%d,x,y);return 0;习题4.8：/* Note:Your choice is C IDE */#include stdio.hvoid main()int grade;scanf(%d,&grade);if(grade=90)printf(A);elseif(grad

10、e=80)printf(B);elseif(grade=70)printf(C);elseif(grade=60)printf(D);elseprintf(E);return 0;例4.9：/* Note:Your choice is C IDE */#include stdio.hvoid main()int i,n;scanf(%d,&i); n=i/10000; i=1%10000; printf(n=%dn,n); n=i/1000; i=1%1000; printf(n=%dn,n); n=i/100; i=1%100; printf(n=%dn,n); n=i/10; i=1%10

11、; printf(n=%dn,n); n=i; printf(n=%dn,n); return 0;/* Note:Your choice is C IDE */#include stdio.hvoid main()long n,i;scanf(%d,&i); n=i/10000; i=i%10000; printf(n=%dn,n); n=i/1000; i=i%1000; printf(n=%dn,n); n=i/100; i=i%100; printf(n=%dn,n); n=i/10; i=i%10; printf(n=%dn,n); n=i; printf(n=%dn,n); ret

12、urn 0;/* Note:Your choice is C IDE */#include stdio.hvoid main()long n,a,b,c,d,e;printf(Please input a numbern); scanf(%d,&n);if(n/10000=1)a=n/10000;n=n%10000;b=n/1000;n=n%1000;c=n/100;n=n%100;d=n/10;e=n%10;printf(This is a 5weishun);printf(%dn%dn%dn%dn%dn,a,b,c,d,e);elseif(n/1000=1)b=n/1000;n=n%100

13、0;c=n/100;n=n%100;d=n/10;e=n%10;printf(This is a 4weishun);printf(%dn%dn%dn%dn,b,c,d,e);elseif(n/100=1)c=n/100;n=n%100;d=n/10;e=n%10;printf(This is a 3weishun);printf(%dn%dn%dn,c,d,e);elseif(n/10=1)d=n/10;e=n%10;printf(This is a 2weishun); printf(%dn%dn,d,e);elseprintf(This is a 1weishun);printf(%dn

14、,n);例5.1：/* Note:Your choice is C IDE */#include stdio.hvoid main()int i=1,sum=0;dosum=sum+i;i=i+1;while(i=100);printf(sum=%dn,sum);return 0;例5.2：/* Note:Your choice is C IDE */#include stdio.hvoid main()int i=1,sum=0;dosum=sum+i;i=i+1;while(i=100);printf(sum=%dn,sum);return 0;例5.3：/* Note:Your choi

15、ce is C IDE */#include stdio.hvoid main()int i,sum=0;printf(please enter i,i=?);scanf(%d,&i);while(i=10)sum=sum+i;i+;printf(sum=%dn,sum);return 0;例5.4：/* Note:Your choice is C IDE */#include stdio.hvoid main()int n;for(n=100;n=200;n+)if(n%3=0)continue;printf(%d,n);printf(n);return 0;例5.5：/* Note:You

16、r choice is C IDE */#include stdio.hvoid main()int i,j,n=0;for(i=1;i=4;i+)for(j=1;j=5;j+,i+)if(n%5=0)printf(n);printf(%dt,i*j);printf(n);return 0;例5.6：/* Note:Your choice is C IDE */#include stdio.hvoid main()int i,j,n=0;for(i=1;i=4;i+)for(j=1;j=5;j+,n+)if(n%5=0)printf(n);printf( %d,i*j);printf(n);r

17、eturn 0;例5.7：/* Note:Your choice is C IDE */#include stdio.h#include math.hvoid main()int f1=1,f2=1,f3,i;printf(%dn%dn,f1,f2);for(i=1;i=38;i+)f3=f1+f2;printf(%dn,f3);fi=f2;f2=f3;return 0;例5.8：/* Note:Your choice is C IDE */#include stdio.h#include math.hvoid main()int f1=1,f2=1,f3,i;printf(%dn%dn,f1

18、,f2);for(i=1;i=38;i+)f3=f1+f2;printf(%dn,f3);f1=f2;f2=f3; return 0;例5.9：/* Note:Your choice is C IDE */#include stdio.h#include math.hvoid main()int n,i;printf(please enter an integer number,n=?);scanf(%d,&n);for(i=2;i=n-1;i+)if(n%i=0)printf(number is a sushu);break;else continue;printf(number is no

19、t a sushu);return 0;例5.10：/* Note:Your choice is C IDE */#include stdio.hvoid main()int i,n,k=0;for(n=101;n=200;n=n+1) for(i=2;i0)printf(%dn,n);break;else continue; return 0;习题5.5:/* Note:Your choice is C IDE */#include stdio.hvoid main()int a,b,n,k;double c=0,t=1;scanf(%d%d,&a,&n);b=a;for(k=1;k=n;k

20、+)c=a+c;t=10*t;a=a+b*t;printf(%f,c);return 0;习题5.6：/* Note:Your choice is C IDE */#include stdio.hvoid main()float n=1,k=1,s=0;while(n=4)s=s+k;n=n+1;k=k*n;printf(%fn,s);return 0;习题5.7：/* Note:Your choice is C IDE */#include stdio.hvoid main() float k=1,s=0;while(k=100)s=s+k;k=k+1;k=1;while(k=50)s=s+

21、k*k;k=k+1;k=1;while(k=10)s=s+1/k;k=k+1;printf(s=%f,s);return 0;习题5.8：/* Note:Your choice is C IDE */#include stdio.hvoid main()int n,i,j,k;for(n=100;n=999;n+)i=n/100;j=n%100;j=j/10;k=n%10;if(n=i*i*i+j*j*j+k*k*k)printf(%dn,n);return 0;习题5.10：/* Note:Your choice is C IDE */#include stdio.hvoid main()f

22、loat i=1,j=2,k=3,s=2,n,a;for(n=2;n=20;n+)s=s+k/j;i=j;a=k;k=j+k;j=a;printf(%fn,s);return 0;习题5.16：/* Note:Your choice is C IDE */#include stdio.hvoid main()int i,j,k;for(i=0;i=3;i+)for(j=0;j=2-i;j+)printf( );for(k=0;k=2*i;k+)printf(*);printf(n);for(i=0;i=2;i+)for(j=0;j=i;j+) printf( );for(k=0;k=4-2*i

23、;k+)printf(*);printf(n);return 0;例6.1：/* Note:Your choice is C IDE */#include stdio.hvoid main()int i,a10;for(i=0;i=0;i-)printf(%d ,ai);printf(n);return 0;例6.2：/* Note:Your choice is C IDE */#include stdio.hvoid main()int i;int f20=1,1;for(i=2;i20;i+)fi=fi-1+fi-2;for(i=0;i20;i+)if(i%5=0)printf(n);pr

24、intf(%12d,fi);printf(n);return 0;例6.3：/* Note:Your choice is C IDE */#include stdio.hvoid main()int a10;int i,j,t;printf(input 10 number :n);for(i=0;i10;i+)scanf(%d,&ai);printf(n);for(j=0;j9;j+)for(i=0;iai+1)t=ai;ai=ai+1;ai+1=t;printf(the sorted numbers :n);for(i=0;iy? x:y;return (z);例7.3：/* Note:Yo

25、ur choice is C IDE */#include stdio.hvoid main()float add(float x,float y);float a,b,c;printf(Please enter a and b:);scanf(%f,%f,&a,&b);c=add(a,b);printf(sum is %fn,c);return 0;float add(float x,float y)float z;z=x+y;return (z);数据转换：/* Note:Your choice is C IDE */#include stdio.hvoid main()char a,b,c,d,e,f;int g=22,sum;a=n;b=a;c=n;d=n;e=a;f=n;sum=a+b+c+d+e+f+g;printf(sum is %dn,sum);return 0;