C语言课后题答案.pdf

P60 请编写一个程序 输出当年当月的月历 include main int year month leap 0 days mfirst 0 one i scanf d d d one 1月1号星期几 days当 月有多少天 if year 4 0 for i 1 i month i switch i case 1 case 3 case 5 case 7 case 8 case 10 case 12 days 31 break case 2 if leap 1 days 29 else days 28 break case 4 case 6 case 9 case 11 days 30 break mfirst days 累加1月到本月的天数 mfirst days 本月之前的天数 days本月的天数 mfirst mfirst one mfirst mfirst 7 本月之前应有多少空余的 printf days d n days printf Sun tMon tTue tWed tThu tFri tSat n for i 1 i mfirst i printf t for i 1 i days i if mfirst 7 0 printf n printf d t i mfirst getch P59 6 输入100个数 统计其中偶数的平均值 include main int i j sum 0 count 0 for i 1 i 100 i scanf d if j 2 0 sum sum j 偶数的和 count 偶数的个数 printf 偶数的平均值是 f sum 1 0 count getch 输入一个正整数 输出这个整数的所有因子 include int main void int a i a是输入的正整数 i是a的因子 printf 请输入一个正整数 scanf d if a 0 printf 输入的数不是正数 return 1 printf d的因子有 n a for i 1 i a i if a i 0 printf d i return 0 P59 7 输入一行英文句子 输出到屏幕上 并将每个单词的首字符改写 成大写字母 仅该携手字符为英文字母的单词 include void main int word 0 char c while c getchar n if c word 0 putchar c else if word 0 word 1 if c a else putchar c else putchar c 输出100以内的所有素数 每行输出5个 include stdio h main int m i count 0 for m 2 m 100 m for i 2 i m 1 i if m i 0 break if i m printf 5d m count if count 5 0 printf n P61 三 1 输入4个整数 输出最大最小值 include int main void int max 32768 min 32767 int i j printf 请输入4个整数 for i 1 imax max j if j min min j printf n最大值是 d 最小值是 d max min return 0 P37 填空题 2 value 100 P60 程序填空题 1 1 i 程序填空题 2 dec 0 dec dec 8 P78 程序填空题 1 ivalue j P230 程序填空题 1 sum s i score sum 1 0 NUM 编程题 P77 3 韩信点兵 解一 include stdio h main int i 1 leap 0 i代表士兵数 leap代表还没得到解 while leap 0 if i 5 1 leap 1 i 解二 include stdio h main int i 1 i代表士兵数 for i 1 i 32767 i if i 5 1 break P77 4 水仙花数 解一 include stdio h main int b s g n for b 1 b 9 b for s 0 s 9 s for g 0 g 9 g n 100 b 10 s g if n b b b s s s g g g printf d n 解二 include stdio h main int b s g n for n 100 n 999 n b n 100 s n 100 10 g n 10 if n b b b s s s g g g printf d n P77 5 输出1 2 3 2 3 4 99 100 101 include int main void long i j sum 0 TC环境下要用 long型 for i 1 i 100 i j i i 1 i 2 sum j printf ld sum getch return 0 P77 上机练习题1 三色球 include main int i j k printf red white black n for i 0 i 3 i for j 0 j 0 P78 上机练习题2 计算1 1 2 1 3 1 99 1 100 直至最后项的绝对值小于10 4为止 include include main float y 0 temp s 1 int i 1 do temp s i y y temp i s s while fabs temp 1e 4 printf 1 1 2 1 99 1 100 f n y P79 1 求解100的所有质因子 解一 include main int m i n k scanf d m被求质因子的数 k m 2 质因子在2到k之间 for i 2 i k i 在2到k之间求质因子 if m i 0 判断i如果是因子 for n 2 n i n 再判断i是否是素数 if i n 0 break if n i i是质因子 printf d i P79 2 求 要求精度到10 6 include main float y 1 temp int i 1 do temp 1 0 i i 1 y y temp i while temp 1e 6 printf y f n y P121 6 120名职工生日 解一 include main int birth 13 0 i n 定义数组有13个元素 只用后12个元素 for i 1 i 120 i scanf d birth n for i 1 i 12 i printf d month d n i birth i 解二 利用随机函数产生数据 以方便程序调试 include include main int birth 13 0 i n randomize for i 1 i 120 i n random 12 1 birth n for i 1 i 12 i printf d month d n i birth i P121 5 查找一个整数key include include main int num 100 i key found 0 randomize for i 0 i 100 i num i random 100 printf input look for number scanf d for i 0 i 100 i if num i key printf num d d i num i found 1 if found 0 printf not found n getch P122 上机练习题1 软件下载次数排序 include include main int num 101 count 101 i j k temp randomize for i 1 i 101 i num i i for i 1 i 101 i count i random 100 for i 1 i 100 i k i for j i 1 j 101 j if count k count j k j if k i temp count i count i count k count k temp temp num i num i num k num k temp for i 1 i 10 i printf bian hao d ci shu d num i count i printf n 0 count for i 1 i 101 i if count i 0 printf d num i getch P122 上机练习题2 统计单词数目 include void main char string 81 int i num 0 word 0 char c gets string for i 0 c string i 0 i if c word 0 else if word 0 word 1 num printf There are d words n num P124 1 排序 输入n个值 选择排序 挑选出前m个数值 立即结束 include define num 100 main int a num i j k n m temp printf n n 100 m m n scanf d d for i 0 i n i scanf d for i 0 i m i 只排前m个 k i for j i 1 j n j if a j a k k j temp a i a i a k a k temp for i 0 i m i printf d a i getch P124 2 输出年 月 日 include include main char date 11 char mm 3 int month day year printf input date mm dd yyyy gets date month date 0 0 10 date 1 0 day date 3 0 10 date 4 0 year date 6 0 1000 date 7 0 100 date 8 0 10 date 9 0 switch month case 1 strcpy mm Jan break case 2 strcpy mm Feb break case 3 strcpy mm Mar break case 4 strcpy mm Apr break case 5 strcpy mm May break case 6 strcpy mm Jun break case 7 strcpy mm Jul break case 8 strcpy mm Aug break case 9 strcpy mm Sep break case 10 strcpy mm Oct break case 11 strcpy mm Nov break case 12 strcpy mm Dec break printf s d d n mm day year getch P159 4 输出1000以内的所有素数 解 include int isPrime int x int i for i 2 i x i if x i 0 break if i x return 1 如果是素数返回1 否则返回0 else return 0 main int y line 0 y代表被判断的数 line代表素数个数 for y 1 y 1000 y if isPrime y printf 5d y line if line 8 0 printf n 或 int isPrime int x int i for i 2 i x i if x i 0 return 0 如果不是素数返回0 return 1 如果是素数返回1 P159 5 将给定字符串中的所有字母改成小写字母 include include void func char str int i for i 0 str i 0 i if str i A main char str 100 printf please input a string gets str func str printf s str P159 6 求1 2 2 3 3 4 n n 1 解 include long func int x long int i sum 0 for i 1 i x i sum i i 1 return sum main int n printf nplease input n scanf d printf nThe result is ld func n P160 上机练习题1 解 include include main int n double x y printf n MENU printf n sin 1 printf n cos 2 printf n pow 3 printf n sqrt 4 printf n exit 5 printf n Select scanf d switch n case 1 printf input double x scanf lf y sin x break case 2 printf input double x scanf lf y cos x break case 3 printf input double x y scanf lf lf y pow x y break case 4 printf input double x scanf lf y sqrt x break case 5 exit default printf Error printf y lf y P160 上机练习题2 解 include void Input int value int n void Output int value int n void Sort int value int n int MaxValue int value int n int MinValue int value int n double Average int value int n main int value 100 n printf How much numbers scanf d Input value n Output value n Sort value n printf nAfter sorted the sequence is Output value n printf nThe max number is d MaxValue value n printf nThe min number is d MinValue value n printf nThe average is f n Average value n getch void Input int value int n int i for i 0 i n i printf Please input the NO d i 1 scanf d void Output int value int n int i for i 0 i n i printf 5d value i if i 1 5 0 printf n printf n void Sort int value int n int i j min temp for i 0 i n 1 i min i for j i j n j if value j value min min j if min i temp value i value i value min value min temp int MaxValue int value int n int i max value 0 for i 0 imax max value i return max int MinValue int value int n int i min value 0 for i 0 i n i if value i min min value i return min double Average int value int n int i int sum 0 double ave for i 0 i n i sum value i ave sum 1 0 n return ave P162 编程题1 解 include long func int n int i long mul 1 for i 1 i n i mul i return mul void main int m n printf input m n scanf d d printf nThe result is ld func m func m n getch P227 4 解 struct Information char name 10 char office phone 20 char home phone 20 char cell phone 12 char fox 20 void main struct Information communication 100 P227 5 解 注意