C_primer_plus(第五版)习题答案.doc

第一章：复习题：1.在一个系统上编写的C程序经过很少的改动或者是不经过修改就可以在其他系统上运行。如果修改是必要的，则通常只需改变伴随主函数的一个头文件中的几项内容即可。2.源代码文件：包含程序设计的C实现形式，用编程语言。目标代码文件包含源代码的转换结果（机器语言代码），但他还不是一个完整的程序。目标文件和可执行文件都是由机器语言指令组成的。但目标文件只包含所编写代码转换成的机器语言，而可执行文件还包含所使用的库例程以及启动代码的机器代码。3.7个步骤：定程序的目标；2.设计程序；3.编写代码；4.编译；5.运行程序；6.测试和调试程序；7.维护和修改程序4.编译器的任务是：将源代码转换为目标代码（计算机语言所表示的代码）。5.链接器的任务是：将目标代码，系统的标准启动代码和库代码结合在一起，并将他们存放在单个文件，即可执行文件中。编程练习：程序目标：提示用户输入英寸之后，完成英寸与厘米的转换，然后将输入值和转换值同时输出。程序设计：输入英寸值，判断输入数值是否合理，转换，输出第二章：1.C程序的基本模块称为函数2.不遵循C语言的规则就会犯语法错误，类似于英语中的语法错误。3.语义错误就是意思上面的错误，遵循了C语言的规则，但是结果不正确的时候就烦了语义错误。4. # include int main(void)int s;s = 56;printf(there are %d weeks in a year!n, s);return 0;5. Baa Baa Black Sheep.Have you any wool?begone!0 creature of lard!what?No/nbonzo?2 + 2 =46.关键字： int n1 = 3020; int n2 = 350;printf(“There were %d words and %d linesn”,n1,n2);8.第7行：a=5,b=2;第8行：a=5,b=5;第9行：a=5,b=5;编程练习：1.# include int main(void)printf(Chang xiao bon);printf(Changnxiao bon);printf(Chang );printf(xiao bon);return 0;2. #include int main(void)printf(Hui chaon329n);return 0;3.见代码4. #include void sentence1(void);void sentence2(void);int main(void)printf(For hes a jolly good fellow!nFor hes a jolly good fellow!n);sentence1();sentence2();return 0;void sentence1(void)printf(For hes a jolly good fellow!n);void sentence2(void)printf(Which nobody can deny!n);5. #include int main(void)int toes;toes = 10;printf(toes = %d ntoes + toes = %d ntoes * toes = %dn,toes,toes+toes,toes*toes);return 0;6. #include void smile(void);int main(void)for(int i=3;i=1;i-)for(int j=1;j=i;j+)smile();printf(n);return 0;void smile(void)printf(Smile!);7. #include void one_three(void);void two(void);void three(void);int main(void)printf(starting now: n);one_three();printf(done!n);return 0;void one_three(void)printf(onen);two();void two(void)printf(twon);three();void three(void)printf(threen);第三章:复习题:1.unsigned int ; float ; char; unsigned int;2.long可以容纳比int更大的数；保证可移植性，确实需要处理更大的值，那么使用一种在所有系统上都保证至少是32位的类型会使程序的可移植性更好。3.要获得正好是32位的数，可以使用int32_t。要获得客村住至少32为的最小类型，可使用int_least32_t。如果要在32为类型中获得提供最快计算素的的类型，可以选择int_fast32_t。4.char 常量；int 常量；double 常量；unsigned int 常量 16进制格式；double 常量5. #include int main(void)float g,h;float tax,rate;rate = 0.08;g = 1.0e5;tax = rate * g;h = g + tax;printf(you owe $%.2f plus $%.2f in taxes for a total of $%.2f.n,g, tax, h);return 0;9. ch = r; ch = 13; ch = 015; ch = 0xd10. #include int main(void)int cows,legs;printf(how many cow legs did you count?n);scanf(%d,&legs);cows= legs / 4;printf(that implies there are %d cows.n,cows);return 0;11.换行字符；反斜杠字符；双引号字符，制表字符编程练习1. #include int main(void)int i = 2147483647;unsigned int j = 4294967295;printf(%d %d %dn, i, i+1, i+2);printf(%u %u %un, j, j+1, j+2);/整数的溢出，当达到最大值时，将会溢出到起始点float toobig = 3.4e38 * 100.0f;printf(%en,toobig);/浮点值的上溢，被赋予一个无穷大的值，printf（）函数显示此值为inffloat toosmall = 0.1234E-10;toosmall = toosmall / 10;printf(%en,toosmall);/下溢，指数部分已达到最小值，计算机只好将尾数部分进行右移，空出首位的二进制位，丢弃最后一位的二进制位return 0;2. #include int main(void)char ch = 66;printf(%cn, ch);return 0;3. #include int main(void)printf(aaaaStartled by the sudden sound,Sally shouted. By the Great Pumpkin,what was thatn);return 0;4. #include int main(void)float a;scanf(%f,&a);printf(the input is %f or %e.n, a, a);return 0;5. #include int main(void)float second = 3.156e7;int age;printf(please input your age:n);scanf(%d,&age);printf(total second by now is %e.n,second * age);return 0;6. #include int main(void)double mass = 3.156e-23;int quart;double num;printf(please input quarts:n);scanf(%d,&quart);num = quart * 950 / mass;printf(total num is %le.n,num);return 0;7. #include int main(void)float height;printf(please input your height:n);scanf(%f,&height);printf(total num is %f.n,height/2.54);return 0;第四章:复习题:1.程序不能正常工作，第一个scanf只读入名而没有读入姓，那么姓依然被存在缓冲区域，那么当下一个scanf想读入体重时，他从上次读入结束的地方开始，酒吧姓读入为体重。2.234.50；Hi! ；His Hamlet was funny without being vulgar. (换行)has 42characters.;1.20e+003,1201.003.在末尾和开头分别添加”.4. #include #define B booboo#define X 10int main(void)int age, xp;char name40;printf(please enter your first name .n);scanf(%s,name);printf(all right, %s ,age?n,name);scanf(%d,&age);xp = age + X;printf(that is a %s,you must be at least %dn,B,xp);return 0;5. #include #define Book War ang Peaceint main(void)float cost = 12.99;float percent = 80.0;printf(This copy of %s sells for $%.2f.nThat is %2.0f% of list.n,Book,cost,percent);return 0;6.%d;%#4X;%10.3f;%12.2e;%-30s7.%15lu;%#4x;%-12.2E;%+10.3f;%8.8s;8.%6.4d;%#*o;%2c;%+0.2f;%-7.5s;9.a. int a;scanf(%d,&a);b. float a, b; scanf(%f %E,&a,&b);c. char a10;scanf(%s,a);d. char a10;int b;scanf(%s %d,a,&b);e. int b;scanf(%*s %d,&b);10.空白字符：包括空格，制表符，换行符。C使用空白字符分割各个语言符号；scanf使用空白字符分割相邻的输入项11.会发生替换，但是所有的小括号都将被大括号替换，不科学，不合理。编程练习1. #include int main(void)char name20;char family_name20;printf(please input your name:);scanf(%s,name);printf(please input your family name:);scanf(%s,family_name);printf(your name :%s, %sn,name, family_name);return 0;2. #include int main(void)char name20;printf(please input your name:);scanf(%s,name);printf(your name :%sn,name);printf(your name :%20sn,name);printf(your name :%-20sn,name);printf(your name : %sn,name);return 0;3. #include int main(void)float a;printf(please input the value:);scanf(%f,&a);printf(The input is %.1f or %.1en,a,a);printf(The input is %+.3f or %.3En,a,a);return 0;4. #include int main(void)float a;char name20;printf(please input your name:);scanf(%s,name);printf( input your hight in feet:);scanf(%f,&a);printf(%s, you are %.3f feet talln,name,a);return 0;5. #include #include int main(void)int a,b;char name120;char name220;printf(please input your name:);scanf(%s,name1);printf(please input your family name:);scanf(%s,name2);a = strlen(name1);b = strlen(name2);printf(%s %sn,name1,name2);printf(%*d %*dn,a,a,b,b);return 0;/结尾对齐printf(%-*d %-*dn,a,a,b,b);/开始对齐6. #include #include int main(void)double a;float b;a = 1.0/3.0;b = 1.0/3.0;printf(double = %.4f float = %.4fn,a,b);printf(double = %.12f float = %.12fn,a,b);printf(double = %.16f float = %.16fn,a,b);printf(double = %.20f float = %.20fn,a,b);printf(FLT_DIG = %d,DBL_DIG = %dn,FLT_DIG,DBL_DIG);return 0;7. #include #define GTL 3.785int main(void)float g,m;float l,k,l_100;const float MTK = 1.609;printf(input the miles driven:);scanf(%f,&m);printf(input the gallons of gasoline consumed:);scanf(%f,&g);l = GTL * g;k = MTK * m;l_100 = l / k * 100;printf(%.1f gasoline per 100KM consumedn,l_100);return 0;第五章复习题1.x=30；x=27；y=x=1；y=9,x=3；2.x=3;x=52;x=0;x=13;3. #include int main(void)int i = 1;float n;printf(Watch out !Here come a bunch of fractions!n);while(+i30)n = 1.0/i;printf(%fn,n);printf(thats all , folks!n);return 0;4.进行第一次判断是，程序还没来得及获得sec的值，这样会碰巧处在那个内存位置上的一个垃圾纸进行比较；而且会输出0。较好的解决方案是，使scanf语句在while判断之前执行。5. %s! C is cool! C is cool!；11；11；12；11.6.SOS: 4 4.007. 1 2 3 4 5 6 7 8 9 108. #include const int g = 103; int main(void)int i = 96;while(i+ g)printf(%3c,i);printf(n);return 0;或: #include int main(void)char i = a;while(i =g)printf(%3c,i+);printf(n);return 0;9.a.1 2;b.101 102 103 104;c.stuvw;10.对n没有限制，导致while语句进入死循环，程序一直打印COMPUTER BYTES DOG。11.a.x+=10,x= x+10;b.+x;c.c=2*(a+b);d.c =a+2*12.a.-x;b.m = n%k; c.p =q/(b-a);d.x = (a+b)/(c*d)编程练习1. #include #define M_TO_H 60int main(void)int minute,hour,left;printf(please enter the number of minutes: );scanf(%d,&minute);while(minute0)hour = minute / M_TO_H;left = minute % M_TO_H;printf(%d minutes is %d hours ,%d minutesn,minute,hour,left);printf(NEXT:);scanf(%d,&minute);printf(Finish!n);return 0;2. #include int main(void)int num,limit;printf(please enter the number: );scanf(%d,&num);limit = num +10;while(num = limit)printf(%3d,num+);printf(nFinish!n);return 0;3. #include #define D_TO_W 7int main(void)int day,week,left;printf(please enter the number of days: );scanf(%d,&day);while(day0)week = day / D_TO_W;left = day % D_TO_W;printf(%d days are %d weeks ,%d daysn,day,week,left);printf(NEXT:);scanf(%d,&day);printf(Finish!n);return 0;4. #include #define CM_TO_FEET 30.48#define CM_TO_INCH 2.54int main(void)float cm,inch;int feet;printf(Enter a height in centimeters: );scanf(%f,&cm);while(cm0)feet = cm / CM_TO_FEET;inch = (cm - feet*CM_TO_FEET) / CM_TO_INCH;printf(%.1f cm = %d feet ,%.1f inchessn,cm,feet,inch);printf(Enter a height in centimeters(=0 to quit):);scanf(%f,&cm);printf(byen);return 0;5. #include int main(void)int count, sum, limit;count = 0;sum = 0;printf(input the number to reach:);scanf(%d,&limit);while(count+limit)sum = sum + count;printf(sum = %dn,sum);return 0;6. #include int main(void)int count, sum, limit,tmp;count = 0;sum = 0;printf(input the number to reach:);scanf(%d,&limit);while(count+limit)tmp=count*count;sum = sum + tmp;printf(sum = %dn,sum);return 0;7. #include float cubic_num(float);int main(void)float num,cubic;printf(please input a number:);scanf(%f,&num);cubic = cubic_num(num);printf( cubic(%.3f) = %.3fn,num,cubic);return 0;float cubic_num(float num)float a;a = num*num*num;return a;8. #include void Temperatures(double);const float K = 1.8;const float A = 32.0;const float B = 273.16;int main(void)double TM;int a;printf(please input the degree Fahrenheit:);a = scanf(%lf,&TM);while(a = 1)Temperatures(TM);printf(please input the degree Fahrenheit(q to quit):);a = scanf(%lf,&TM);return 0;void Temperatures(double TM)double celsius,kelvin;celsius = (TM-A) / K;kelvin = celsius + B;printf(Fahrenheit:%.2lf, Celsius:%.2lf, Kelvin:%.2lfn,TM,celsius,kelvin);第六章复习题：1.2；7；70；64；8；2；2.36 18 9 4 2 13.x5;scanf(“%lf”,&x)!=1;x =5;4. scanf(“%d”,&x) = 1;x=205. #include int main(void)int i, j, list10;for(i = 0; i 10; i+)listi = 2*i + 3;for(j = 0; j=i; j+)printf( %d,listj);printf(n);return 0;6. #include #define LINE 4#define ROW 8int main(void)int i, j;for(i = 0; i LINE; i+)for(j = 0; j ROW; j+)printf($);printf(n);return 0;7.a.Hi! Hi! Hi! Bye! Bye! Bye! Bye! Bye! b.ACGM8.a.Go west, youn b.Hp!xftu-!zpvo c.Go west, young d.$o west, youn9.31|32|33|30|31|32|33| * 1 5 9 13 * 2 6 4 8 8 10 * = = = = =10.mint;10;double;ii;11.增加声明 int i, j;第一个for循环 for(index = 1,i = 0;i SIZE; index+,i+)第二个for循环 for(i = 0;i SIZE; i+)printf(“%d ”,by_twosi);12.函数应该把返回类型声明为long，并包含一个返回long值的return语句。13. long squre(int num)return (long)num) * num;14.1:Hi! k = 1 k is 1 in the loop Now k is 3 k = 3 k is 3 in the loop Now k is 5 k = 5 k is 5 in the loop Now k is 7 k = 7编程练习1. #include #define N 26int main(void)int letterN;int i;char a = a;for(i = 0; i N; i+)letteri = a + i;for(i = 0; i N; i+)printf(%2c,letteri);return 0;2. #include int main(void)int i, j;for(i = 1; i = 5; i+)for(j = 1; j=i; j+)printf($);printf(n);return 0;3. #include int main(void)char ch = F;int i, j;for(i = 0; i = 5; i+)for(j = 0; j=i; j+)printf(%c,ch-j);printf(n);return 0;4. #include int main(void)char ch;printf(please input a letter:);scanf(%c,&ch);char a = A;int i, j, k, l;for(i = 0; i = (ch - a); i+)for(j = 1; j = (ch - a - i); j+)printf( );for(l = 0; l = 0; k-)printf(%c,a+k);printf(n);return 0;5. #include int main(void) int min, max; int i; printf(please input the floor level and the upper level:); scanf(%d%d,&min,&max); printf(The floor level is %d and the upper level is %dn,min,max); printf( n n*n n*n*n n); for(i = min; i=max; i+) printf( %d %d %d,i,i*i,i*i*i); printf(n); return 0;6. #include #include int main(void)char word20;int i;printf(please input a word:);scanf(%s,word);printf(Reverse :);for(i = strlen(word)-1; i = 0; i-)printf(%c,wordi);printf(n);return 0;7. #include int main(void)double x, y, z;printf(Please input two float number:);while(2 = (scanf(%lf%lf,&x,&y)z = (x-y) / (x*y);printf(%lf-%lf)/(%lf*%lf) = %lfn,x,y,x,y,z);printf(Please input two float number:(q to quit);return 0;8. #include double f(double x, double y);int main(void)double x, y, z;printf(Please input two float number:);while(2 = (scanf(%lf%lf,&x,&y)f(x,y);printf(Please input two float number:(q to quit);return 0;double f(double x, double y)double z;z = (x-y) / (x*y);printf(%lf-%lf)/(%lf*%lf) = %lfn,x,y,x,y,z);return z;9. #include int main(void)int max, min, sum;int i;printf(Enter lower and upper integer limits :);scanf(%d%d,&min,&max);while(max min)sum = 0;for(i = min; i = max; i+)sum += i*i;printf(The sums of the squares from %d to %d is %dn,min*min,max*max,sum);printf(Enter next setof limits:);scanf(%d%d,&min,&max);return 0;10. #include #define L 8int main(void)int ArrayL;int index;printf(please input %d integers:,L);for(index = 0; index L; index+)scanf(%d,&Arrayindex);printf(The %d integers are :,L);for(index = 0; index = 0; index-)printf(%d ,Arrayindex);printf(n);return 0;11. #include int main(void)double sum1 = 0;double sum2 = 0;int times, sign;int i;sign = 1;printf(please input the number of times:);scanf(%d,×);for(i = 1; i = times; i+)sum1 += 1.0 / i;sum2 += 1.0 / i * sign;sign = sign * (-1);printf(sum1 = %lf; sum2 = %lfn,sum1,sum2);return 0;12. #include #define L 8int Pow(int n);int main(void)int ArrayL;int index = 0;for(index = 0; index L; index+)Arrayindex = Pow(index); /使用头文件#include ,Arrayindex = pow(2,i);index = 0;doprintf(%d ,Arrayindex);while(+index8);printf(n);return 0;int Pow(int n)int pow, i;pow = 1;for(i = 1; i = n; i+)pow *= 2;return pow;13. #include #define L 8int main(void)double firstL, secondL;int index;printf(please int %d float numbers:,L);for(index = 0;index L; index+)scanf(%lf,&firstindex);for(index = 0;index L; index+)printf(%8.2lf ,firstindex);printf(n);second0 = first0;for(index = 1;index L; index+)secondindex = secondindex-1 + firstindex;for(index = 0;index L; index+)printf(%8.2lf ,secondindex);return 0;14. #include #define L 20int main(void)char stringL;int index;printf(please input:);for(index = 0; index = 0; index-)printf(%c,stringindex);printf(n);return 0;15. #include #define SM 100#define K 0.1#define L 0.05int main(void)int years = 0;double Da = SM;double De = S