1、C语言习题答案2C语言习题答案第1章1选择题(1) C (2) B (3) A 2填空题(1)main (2) main (3) 有穷性、确定性、有零个或多个输入、有一个或多个输出、有效性(4) 顺序、分支和循环(5) 自顶向下,逐步细化、模块化设计、结构化编码第2章1选择题12 345 6 7 890 1234 5ACCDA DCABA BBDDB 2、填空题 (1) 数字、字母、下划线 (2)0 (3) 4、8 (4) (a+b)*c/(a-b) (5) 60 (6)16(7)9 (8)6、4、2 (9)0 (10)10、6 (11)5.500000 (12) 12、4(13) 0 (14
2、)16 (15)6.63、编程题(1)编写一个程序求各种类型数据的存储长度。#include main() printf(int:%d byten,sizeof(int); printf(short int:%d byten,sizeof(short int); printf(long int:%d byten,sizeof(long int); printf(float:%d byten,sizeof(float); printf(double:%d byten,sizeof(double); printf(long double:%d byten,sizeof(long double);
3、printf(char:%d byten,sizeof(char);(2)#include #define RAT 1.60934main() float k; printf(input the km:); scanf(%f,&k); printf(mile:%fn,k/RAT);第3章1选择题 12 345 67 890(1) (10):DDCDD DCDCC 2解析题(1) x=170,x=170,x=252,x=aa,x=170 x=170,x=170,x=170,x=%6d a=513.789185,a=513.79,a=513.78918457,a=513.78918457(2) a
4、=3b=7x=8.5y=71.82c1=Ac2=a?3编程题(1)main() int x,y; scanf(%d%d,&x,&y); printf(商数=%d,余数=%d,x/y,x%y); (2)main() double x,y,z,avg; scanf(%lf%lf%lf,&x,&y,&z); avg=(x+y+z)/3; printf(%.1f,avg);第4章 1选择题(1)(10) CCAAD CCABD 2填空题(1)a0&b0|a0&c0|b0&c0ab|a5|-a5(a0) 1 !(x=0&x=A&ch=Z ch=ch-32(5) x2 x-1 y=-1 ;(6) a+bc
5、&a+cb&b+ca a=b&a=c a=b|a=c|b=c(7) x0 c=x/10 y!=-23编程题(1)#include main() int x; printf(please input a number:); scanf(%d,&x); if(x%2=0) printf(x is a even number); else printf(x is a odd number);(2)#include main() int x,y; printf(please input a number:); scanf(%d,&x); if(x-5 & x0 & x10) y=x+1; printf
6、(%d,y); else printf(the number is error);(3)#include main() int a,m; printf(please input a number:); scanf(%d,&a); switch(a/10) case 0: case 1: case 2:m=1;break; case 3:m=2;break; case 4:m=3;break; case 5:m=4;break; default:m=5;break; printf(%d,m);(4)#include main() float price,tax; printf(please in
7、put the price of product:); scanf(%f,&price); if(price=10000) tax=price*0.05; else if(price=5000) tax=price*0.03; else if(price=1000) tax=price*0.02; else tax=0; printf(%f,tax);(5)#include main() float score; printf(please input the score of student:); scanf(%f,&score); if(score=85) printf(VERY GOOD
8、); else if(score=60) printf(GOOD); else printf(BAD);(6)# include main () int x,y,z; printf(input two number:); scanf(%d%d,&x,&y); if(x99 | y99) printf(input data error!n); else z=(x/10)*1000+(y/10)*100+(x%10)*10+y%10; printf(%dn,z); 第5章1选择题(1)d (2) c (3)a (4)d (5)a (6)d (7)d (8)b (9)d (10)b(11)c (12
9、)a (13)d (14)d (15)c2填空题(1) fahr celsius=5.0/9*(fahr-32) fahr+=step (2) 5、4、6 (3) 3*i-2(4) y- z*=x (5) 852 (6) j+ i%j=0 j=i(或j=i) (7)sumk sum=k j-2 (8) s=0 p=1 j=i 3改错题 (1) 第一处改正: For改为for 第二处改正:for(k=1;k=4;k+)或for(k=0;k4;k+) 第三处改正: ave=sum/4改为ave=sum/4.0 (2) 第一处改正: j=eps第三处改正:r*2(4) 第一处改正:&n第二处改正:=
10、 =(5) 第一处改正:t=m/10改为t=m%10第二处改正:t=0改为t=0第三处改正:m=m%10改为m=/104编程题(1) 分式累加和。#include main() int s; float n,t,sum; t=1; sum=0; n=1; s=1.0; while(n=100) sum=sum+t; n=n+1; s=-s; t=s/n; printf(sum=%10.6fn,sum);(2)110的阶乘#include main() int i; long int n=1; for(i=1;i=10;i+) n=n*i; printf(i%5=0?%2d!=%-10ldn:%
11、2d!=%-10ld,i,n); (3)由*组成的等腰三角形#include main() int n,i,j; scanf(%d,&n); for(i=1;i=n;i+) for(j=1;j=n+i-1;j+) if(j=n-i) printf( ); else printf(*); printf(n); (4)完数main() int m,s,i; for(m=2;m1000;m+) s=0; for(i=1;im;i+) if(m%i)=0) s=s+i; if(s=m) printf(%d its factors are ,m); for(i=1;im;i+) if(m%i=0) pr
12、intf(%d,i); printf(n); (5)打靶#include main() int h10,h7,h5; for(h10=0; h10=8; h10+) for(h7=0; h7=8; h7+) for(h5=0; h50) x1=(x2+1)*2; /*第一天的桃子数是第2天桃子数加1后的2倍*/ x2=x1; day-; printf(the total is %dn,x1); /代码二main() int i=9,sum=1; for(; i0; sum=2*(sum+1),i-); printf( sum=%dn ,sum); (7)牛顿迭代法一般地:f(x)=a0xn+a1x
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