谭浩强版C语言前5章习题答案.doc

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1、第二章1.x++,3x1,Xf_1_4,a$#24,bg—1,Iam不是标识符3.1）2L转换成float类型，3转换成float型，012转换成float类型，44转换成float类型；2)34转换成double类型，sqrt(34)转换成int类型，6转换成double类型，5转换成double类型，3*（int）sqrt(34)转换成double类型，0x2AF转换成double类型；3)4转换成float类型，2.5f+4转换成double类型，6转换成Long类型，6*27L转换成double类型，1526转换成double，2.4L转换成double4.1）#in

2、cludeintmain(){printf("%f",3*(2L+4.5f)-012+44);return0;}53.2)#include#includeintmain(){printf("%f",3*(int)sqrt(34)-sin(6)*5+0x2af);return0;}703.3）#include#includeintmain(){printf("%f",cos(2.5f+4)-6*27L+1526-2.4L);return0;}1362.6.#include

3、o.h>doubleweight(doublep,doubled){returnp*3.*d*d*d/6.0;}intmain(){printf("theweightofironis:%f",weight(7.86,0.1));printf("theweightofgoldis:%f",weight(19.3,0.15));return0;}铁：0.金：0.7.#include#includeintmain(){inta,b,c,d;doubles,x1,x2;printf("pleaseinputthreenumbers:");sc

4、anf("%d,%d,%d",&a,&b,&c);d=b*b-4*a*c;if(d>0){s=sqrt(d);x1=(-b+s)/2.0/a;x2=(-b-s)/2.0/a;printf("theresultis:%f,%f",x1,x2);}elseif(d==0){x1=-b/2.0/a;printf("theresultis:%f",x1);}elseprintf("error!");return0;}error！第三章4.调用f函数时，1转换成float类型，第一个y转换成int型，函数体中n，4转换成float型，结果由float转换成Int型6.圆球体

5、积：doublesphere_volume(doubleradius){return3.14159*4*radius*radius*radius/3;}圆球表面积：doublesphere_area(doubleradius){return3.14159*4*radius*radius;}圆柱体体积：doublecylinder_volume(doubleradius,doubleheight){return3.14159*radius*radius*height;}圆柱体表面积：doublecylinder_area(doubleradius,doubleheight){r

6、eturn2*3.14159*radius*radius+2*3.14159*radius*height;}7.1)全部用printf()输出2)#includedoubleweight(doubley,doublex){returny*3.*x*x*x/6.0;}intmain(){printf("theweightofgoldis:%f",weight(7.86,0.1));printf("theweightofsilveris:%f",weight(19.3,0.15));printf("theweightofcopperis:%f",we

7、ight(7.86,0.1));printf("theweightofironis:%f",weight(7.86,0.1));printf("theweightoftinis:%f",weight(7.86,0.1));return0;}这种写法程序长度并没有减少，但是减少出错几率，只需在函数中修改圆周率即可，第二种程序修改难度降低3）doubleweight(doubley,doublex){returny*x*x*x;}只需将此函数修改，主函数中程序不变8.#include