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IP屬地：天津 上傳時間：2021-06-09 格式：DOC 頁數(shù)：36 大?。?40KB 積分：25 舉報 版權(quán)申訴

1、C語言程序?qū)嵗龜?shù)組的引用:#includevoid main (int argc, char *argv) int x5 = 2, 3,1, 4, 6 ;int i;for (i = 0; i 5; i+)printf(%dn, 2 * xi);#includevoid main(int argc, char *argv) int x5 = 1, 2, 3, 4, 5 ;int i = 0;for (i = 0; i 5; i+)printf (x%d :%dn, i, xi);一維數(shù)組的最值:#include int main(int argc, char* argvJ) int x5 =

2、1, 2, 3,4, 5 ;int nMax = x0;int i = 0;for (i = 1; i nMax)nMax = xi;printf(max:%dnS nMax);return 0;一維數(shù)組排序:#include void main(int argc, char argv) int arr5 = 9, 8, 3, 5, 2 ; int temp = 0;int i, j；printf CW 泡排序前：n*);for (i = 0; i 5; i+)printf (*%d , arri);printf (” n);for (i = 0; i 5-1; i+)for (j = 0;

3、j arrj + U)temp = arrj;arrj = arrj + 1; arrJ + 1 = temp;printfC冒泡排序后z nO； for (i = 0; 1 5; i+) printf (*%d arri);printf Cn);二維數(shù)組的遺歷#includevoid mainO聲明并初始化數(shù)組int array 3 4 = 1,2, 3,4, 5,6, 7,8, 9,10,11,12 ;for (int 1 = 0; i 3; i+)循環(huán)遠(yuǎn)歷行for (int j = 0; j 4; +)/循環(huán)遍歷列printf (*%d %d: %d , i, j, arrayi j);

4、printf (*n*); 每一行的末尾添加換行符二維數(shù)組應(yīng)用include void main(int argc, char * argv) int StuScore53 = 張同學(xué)88, 70, 90,王同學(xué)80, 80, 60,李同學(xué)89, 60, 85,趙同學(xué)80,75, 78,周同學(xué)70, 80, 80,；int m = 0, n = 0;int nStuTotalScore;int nMathTotalScore = 0;int nChineseTotalScore = 0;int nEnglishTotalScore = 0; printf (*個人總成績：n*);for (m

5、= 0; m 5; m+)nStuTotalScore = 0;for (n = 0; n nStuTotalScore);break;case 1:printf (*王同學(xué)：%dn*, nStuTotalScore); break;case 2:printf 李同學(xué)：nStuTotalScore); break;case 3:printf (*趙同學(xué)：dn nStuTotalScore); break;case 4:printf (*周同學(xué)：dn, nStuTotalScore); break;printf (*小組數(shù)學(xué)總分：%d小組數(shù)學(xué)平均分：2fn,nMathTotalScore, (d

6、ouble)nMathTotalScore / 5):printf (*小組語文總分：%d小組語文平均分：%. 2fn*,nChineseTotalScore, (double)nChineseTotalScore / 5);printf (*小組英語總分：%d小組英語平均分：%. 2fn*,nEnglishTotalScore, (double)nEnglishTotalScore / 5);無參函數(shù)#include void func ()printf (*這是我的第一個函數(shù)！ n*);void mainOfunc ();有參函數(shù)調(diào)用無參函數(shù)ftinclude void func(int

7、x, int y)int sum = x + y; printf(x+y=%dn, sum);void mainOfunc (3, 5);函數(shù)調(diào)用及返回過程#includeint func (int x, int y)return x + y;void mainOint sum = func(3, 5); printf(x+y=%dnS sum);Printf函數(shù)#includevoid mainOprintf C%c %c Hj );printf (“s, Hellow, world! n);printf C%d %d %d nS 2, 3);printf (f %f %f n, 2.1,

8、2.2);Scanf函數(shù)#includevoid mainOchar str 256;字符數(shù)組保存得到的字符串scanf (”s, str);嵌套函數(shù)#includeint max2(int a, int b)用于比較兩個整數(shù)大小的函數(shù)if (a b)return a;elsereturn b;int max4(int a, int b, int c, int d) 用于比較四個整數(shù)大小的函數(shù)int res;res = max2 (a, b);res = max2 (res, c);res = max2 (res, d); return res;void mainOint a = 5, b =

9、 7, c = 9, d = 22, max; printf (*請輸入四個整數(shù)；5 7 9 22 n); /scanf C%d %d %d %dr, a=5, b=7, c=9, d=22); max = max4 (a, b, c, d);printf (max=%d n，max);遞歸調(diào)用#include下面的函數(shù)使用遞歸實現(xiàn)，求廣n的和 int getsum(int n)if (n = 1)return 1;滿足條件，遞歸結(jié)束 int temp = get sum (n 一 1); 在函數(shù)體中調(diào)用自身 return temp + n;void mainOint sum = get su

10、m (4); 調(diào)用遞歸函數(shù)，獲得廣4的和 printf (sum=%drr, sum); 打印結(jié)果外部函數(shù)建立源文件first, cint add(int x, int y)return x + y;建立源文件second, c#includeextern int add(int x, int y);void mainOprintf (“dn add (1, 2);注：extern可以省略內(nèi)部函數(shù)用法建立 first, c#includevoid showOprintf(“sn, first, c;建立 second, c#includcstatic void showOprintf (“%s

11、n, second, c);void mainOshowO ;全局變量#includeint x = 123;void showOprintf （show0 函數(shù)中，x 的值為：%dn, x）;void mainOshowO ;printf （main0函數(shù)中* x 的值為：dn,x）; 當(dāng)局部變量與全局變童:重名時，全局變量會被屏蔽#include int x = 789;void mainOint x =123;printf （x 的值為：dn, x）; 變量的作用域#includeint x = 10;void showOint x = 20;printf （*show0 函數(shù)中，x 的

12、值為* %dnS x）; void mainOint x = 30;printf （main 0 函數(shù)中.x 的值為dn, x）;showO ;If語句#includevoid mainO定義變量xint x = 5;如果x的值小于10則執(zhí)行if大括號中的代碼 if (x 10)X+；printf (rx=%dnr, x);If. else 語句#includevoid mainOint num = 19;if (num % 2 = 0)判斷條件成立，num被2整除 printf (num 是一個偶數(shù)n);elseprintf (num 是一個奇數(shù)n);If-. else ifelse 語句#

13、includevoid mainOint grade = 75;/定義學(xué)生成績 if (grade = 80)滿足條件grsde = 80 printf (-該成績的等級為優(yōu)iT);else if (grade = 70)不滿足條件grade =80,但滿足條件grade=70printfC該成績等級為良nO；else if （grade = 60）不滿足條件grade =70,但滿足條件grade =60 printf（*該成績等級為中n*）;else不滿足條件grade =60 printf （-該成績的等級為差iT）;三元運算符#includevoid mainOint x = 0;in

14、t y = 1;int max;max = x y ? x : y; printf（max = %dn*）;Switch語句#includevoid mainOint week = 5;switch （week）case 1:printf （* 星期一 n*）; break;case 2:printf （*星期二n）;break;case 3:printf （*星期三n）;break;case 4:printfC 星期四 n);break;case 5:printfC 星期五 iT);break;case 6:printfC星期六n);break;case 7:printfC 星期日 n);b

15、reak;default:printf(*輸入的數(shù)字不正確.n*); break;在使用switch語句過程中，如果多個case條件后面的執(zhí)行語句是一樣的，則該執(zhí)行語句只需書寫一 次即可#includevoid mainOint week = 2;switch (week)case 1:case 2:case 3:case 4:case 5:當(dāng)week滿足值1、2、3、4、5中任意一個時，處理方式相同printfC今天是工作日n);break：case 6:case 7:當(dāng)ireek滿足值6、7中任童一個時，處理方式相同printf(*今天是休息日十；break;While循環(huán)語句 #incl

16、udevoid mainOint x = 1;while (x = 4)printf (*x = %dn*, x);/條件成立，打印x的值 x進(jìn)行自增Do-while循環(huán)語句 #include void mainO定義變量x,初始值為1int x = 1;doprintf (*x=%dn*, x);條件成立，打印x的值x進(jìn)行自增 while (x = 4);循環(huán)條件For循環(huán) #includevoid mainOint x = 1;定義變量x,初始值為1doprintf (*x=%dn*, x);/條件成立，打印x的值x進(jìn)行自增 while (x = 4);循環(huán)條件Break語句 #inclu

17、de void mainOint x = 1;定義變量x,初始值為1while (x = 4) 循環(huán)條件printf (*x=%dn*, x);if (x = 3)break;x進(jìn)行自增Goto語句#includeint mainO定義兩個循環(huán)變量外層循環(huán)內(nèi)層循環(huán)判斷i的值是否大于4跳至標(biāo)志位end的語句輸出*換行int i, j；for (i = 1; i = 9; i+)for (j = 1; j 4)goto end;printf(*);printf (iT);end: return 0;Continue 語句#includevoid mainOint sum = 0;定義變量sum,用

18、于記住和for (int i = 1; i = 100; i+)if (i % 2 = 0)如果i是一個偶數(shù)，執(zhí)行if語句中的代碼continue;結(jié)束本次循環(huán)sum += i;實現(xiàn)sum和i的蠹加printfCsum =sum);無符號整數(shù)類型#include void mainOint a = 12345;long b = -23456, suml;unsigned int c = 32800, sum2;suml = b - a;sum2 = c - b;printf(rsuml=%ld, sum2=%uiT, suml, sum2);Float和double之間的數(shù)據(jù)轉(zhuǎn)換 #inclu

19、devoid mainOfloat a;a = 3.141592612; printf(a=% 9fn, a);字符型變量#includevoid mainOchar chi = 1;char ch2 = 65; printf(%cn chi); printf(“cn, ch2);#include void mainO轉(zhuǎn)義符的用法char ch2 = 1 n ;char ch3 = B ；char ch4 = 1 W ;printf (*%cr, ch2); printf (*%cr, ch3); printf (*%cr, ch4); printf(*%cr, ch2);枚舉類型變童#inc

20、ludeenum month JAN=1, FEB=2, MAR=3, APR=4, MAY=5, JU1=6,JUL=7, AUG=8, SEP=9, OCT=1O, NOV=11, DEC=12;void mainOenum month lastmonth, thismonth, nextmonth;lastmonth = APR;thismonth = MAY;nextmonth = JUN;printf(r%d %d %d n, lastmonth, thismonth, nextmonth);在枚舉中規(guī)定，如果不給標(biāo)識符指定具體值，會默認(rèn)該標(biāo)識符的值等于前一標(biāo)識符的值加一。因此可 以

21、快速定義#include/定義一組常疑enum Constants cl, c2, c3 = 4, c4, c5 = 3, c6, c7, c8 = 0f, c9 ; void mainOprintf(c9=%dn, c9);Sizeof運算符 ftinclude void mainO/通過類型名稱計算各基本數(shù)據(jù)類型所占內(nèi)存大小printf(char:%dnr,sizeof(char);printf(short: %dn sizeof(short);printf(long:%dnr,sizeof(long);printf(Afloat:%dn,sizeof(float);printf(doub

22、le: %dn*, sizeof(double);printf(unsigned char: %dn, sizeof(unsigned char);printf(unsigned short: %dn, sizeof(unsigned short);printf(unsigned int: %diT， sizeof(unsigned int);printf(unsigned long: %dn， sizeof(unsigned long);通過變量名稱計算變量所屬數(shù)據(jù)類型占用內(nèi)存大小int = 100;double val.double = 100000. 0;printf(v

23、al_int:%dn, sizeof(val_int);printf(val.double: %dn*, sizeof(valdouble); 指針的取址和取值運算符#includevoid mainOint num = 100;/int 類型變量 numprintf (num=%dnS num);/輸出變:值printf (*#&num = %pn, &num);輸出變量的內(nèi)存地址printf (*&num = %diT, *&num);通過 num 地址讀取 num 中的數(shù)據(jù)指針表達(dá)式的自增自減運算#includevoid mainOint arr5 = 2,3,4,5 ;int *pl

24、= &arr0;int *p2 = fcarr3;printf Cpl 的值為：dn，*pl);printf (+pl 的值為：dn： * (+pl);printf (p2 的值為:%dn, *p2);printf (p2 的值為:%dn (p2); 同類指針相減運算SJ C:windows5ystcm32cmd.exehar =1short: long： f loat:double: 8unsigned char： 1 unsigned short: 2 uniyned int:4unsigned long： 4 ual_int:4ual_double : 8 請按任意鍵繼繕#include

25、void mainOint arr5 = 1,2, 3,4, 5 ;int *pl = tarr0;int *p2 = tarr3;printf Cpl 的值為：dn, pl); printf (p2 的值為:%dn，p2);printf Cpl-p2 的值為：%dn p2-pl); 指針變量的使用#includevoid main(int argc, char* argvJ)int nNum = 0x12345678;int pNum;定義一個指針變就pNum = AnNum;為指針變量賦值printf (nNum Vai: %xnr, nNum); printf (nNum Addr:%p

26、n*, ftnNum); printf (pNum Val:%pn*, pNum); printf (pNum :%xn, *pNum);指針變量作為函數(shù)的參數(shù)（作用是將一個變量的地址傳送到另一個函數(shù)中）#includevoid main(int argc, char* argv)int nNum = 0x12345678;int pNum;定義一個指針變量pNum = ftnNum;為指針變量賦值printf CnNum Val:%xn*, nNum); printf (*nNum Addr:%pn*, &nNum); printf (pNum Val:%pn pNum); printf (

27、pNum :%xn, pNum);指向一維數(shù)組元素的指針#include #include void main(int argc, char* argv)int X10 = 1, 2, 3,4, 5,6, 7, 8,9,10 ;int i = 0;int nLen = 10;printf(*數(shù)組X修改前：n);for (i = 0; i 10; i+)printf(*%d ”， Xi);用指針pTe叩 指向數(shù)組Xint * pTe叩=X;通過指針pTemp訪問數(shù)組中的元素，并修改元素的值 for (i = 0; i nLen; i+)pTcmpEi = pTenpEi 2;printf (*n

28、數(shù)組X修改之后：n*);通過指針移動來遍歷輸出X數(shù)組中的元素for (i = 0; i 10; i+)printf(*%d , *pTemp); pTemp+;printf(n);指向二維數(shù)組元素的指針#include#includevoid mainOint X2 5 = 1, 2, 3,4, 5 , 6, 7, 8,9,10 ;/定義數(shù)組指針用于指向二維數(shù)組int(*pXElement)5 = X;int m = 0;int n = 0; printf (二維數(shù)組元素如下：n*);for (m = 0; m m + 1); for (n = 0; n 5; n+)通過數(shù)組指針來訪問為數(shù)組中

29、的元素 printf (* pXElement m n);指針數(shù)組的概念#include輸出指針數(shù)組中元素的值int print(int arr int n)return 0;int i = 0;for (i = 0; in; i+)printf(M%dn11*arri); return 1;void main(int argc, char * argv) int 巧 b, s d，e;a = 1；b = 2;：=3;d = 4;int *Arr = &a, &b, &c, &d, &e ；定義一個 int 類型的指針數(shù)組 print(Arr, 5);/調(diào)出 print ()函數(shù)指針數(shù)組作為m

30、ain ()函數(shù)的形參#include#includeint main(int argc char argv)int i = 0;printf(程序的參數(shù)列表如下：n“)；for (i = 0; i argc ; i+)printf(n%s argvi);return 0;二級指針#include#includevoid main(int argc, char * argv)int m = 10;int * pM = &m;指針pM存放的是變量m的地址int * ppM = &pM; 二級指針ppM存放的是指針pM的地址 printf(m = %dnm);printf(*pM = %dn*pM

31、); printf= %dnR *ppM);Malloc0函數(shù)和free ()函數(shù)#includevoid main()int u, v;定義二維數(shù)組的長和寬printf(第一維為：“)；scanfCd &u);printf(第二維為：“)；scanfCd &v);int* array = (int* )malloc(sizeof(int*)* u);/先創(chuàng)建第一維for (int i = 0; i u; i+)在內(nèi)層循環(huán)中動態(tài)創(chuàng)建第二維arrayi = (int*)malloc(sizeof(int)*v);for(int j = 0; jv; j+)arrayij = 0;給數(shù)組元素復(fù)制p

32、rintf(H%d arrayij);字符數(shù)組#include void main()/聲明一個字符數(shù)組并初始化char char_array5 = h1, e T,o* ;int i;通過size。于關(guān)鍵字得到數(shù)組長度，并遍歷打印其內(nèi)容.for (i = 0; i sizeof(char_array); +i)printfCc, char_arrayi);printf(n);輸出字符串中的字符#includevoid main()char char_array6 = (hello);/聲明一個長度為6的字符數(shù)組并初始化為hello int i;通過size。于關(guān)鍵字得到數(shù)組長度for (i

33、= 0; i sizeof(char_array); +i)/通過printf輸出char_array中的字符串printf(char_array 的第%dnj i, char_arrayi);獲取用戶輸入字符的長度define _CRT_SECURE_NO_WARNINGS /關(guān)閉安全檢査#include#includevoid mainOchar str 1024; 聲明一個足夠大的字符型數(shù)組保存將要被輸入的字符串printf (請輸入待測量的字符串：);scanfstr): /接受用戶輸入字符串printf (*您輸入的字符串長度為d。n, strlen(str);空字符（0f的使用#i

34、ncludevoid mainOchar char_array 二 h,，e, 1 T ,，1,，o,，0，,，w，,O , r ,1 , d );printf %sn, char_array ;忘記在字符數(shù)組的末尾添加空字符”(r,程序也會出現(xiàn)一些奇怪的 現(xiàn)象#includevoid main ()char char_array二 h, e, 1, 1, o ; printf %sn, char_array ;使用指針修改字符串中的字符#includechar char_eirray = hello world!*;char *ptr;printf C修改前的字符串如下：sn, char_a

35、rray);ptr = char_array;/將一個字符型指針指向字符型數(shù)組char_array的首地址開始修改字符串wh訂e (*ptr != 0) 檢測是否到串未尾if (*ptr =)*ptr 二?。籔tr+;printf (*修改后的字符串如下：s n, char_array);return 0;Gets ()函數(shù)ttpragma warning(disable:4996)#include void main ()char phoneNumber12;printf (請輸入手機(jī)號碼:”);gets(phoneNumber);printf (您的手機(jī)號碼是：%sn,phoneNumbe

36、r);Puts () ttpragma warning(disable:4996)#include void main ()char buf12;puts C請輸入一個字符串：”);gets (buf);puts C您輸入的是：);puts (buf);字符串比較 ttpragma warning(disable:4996)#include #includevoid mainOchar username 100;/定義存放用戶名的字符數(shù)組char password100;定義存放密碼的字符數(shù)組printf (登錄n);printf (請輸入用戶名：”)；gets (username);獲取用戶

37、輸入的用戶名printf (請輸入密碼:)；gets(password);/獲取用戶輸入的密碼/比較輸入的用戶名和密碼是否正確if (!strcmp(password, ILoveC) & (!strcmp(username,user)printf C用戶 s 登錄成功！ n username);elseprintf （登陸失敗，請檢査用戶名或密碼是否正確輸入。）;Strncmp ()函數(shù)#include#includevoid mainOchar* strl = *abcdef*;char* str2 = abcdeg*;/判斷字符串strl和str2中的前5個字符是否相同 if (! st

38、rncmp (strl, str2, 5)printf Cstrl和str2的前5個字符相同)；elseprintf Cstrl和str2的前5個字符不同)；Strchr ()函數(shù)#include#includeint getcount(char* str, char c)/存儲找到的字符個數(shù)int count = 0;存儲當(dāng)前字符指針在字符串中的位置char* ptr = str;獲取第一次出現(xiàn)字符變量C值的指針位置while (ptr = strchr(ptr, c) != NULL)+Ptr;+count;return count;void mainOchar str6 = abaca;

39、char c =;int num = getcount(str, c); printf(字符%c在字符串中出現(xiàn)了d次.n, c, num);Strstr (函數(shù)ffpragma warning (disable: 4996)#include#includevoid mainOchar str10240; 聲明字符串?dāng)?shù)組，用于保存段落char word10240; 聲明字符串?dāng)?shù)組，用于保存要査找的字符串 char* ptr;printf(*請輸入要掃描的段落：)；gets (str);printf(*請輸入要査找的單詞：”)；gets(word);ptr = strstr (str, word)

40、; 搜索是否包含指定的字符串if (ptr = NULL)printf C段落中不包含單詞%So n, word);else得到檢測出的字符串后20個字符if (strlen(ptr) = 20)ptr 20 = 0;printf (單詞出現(xiàn)在s附近。n, ptr);Strcat ()函數(shù)pragma warning(disable:4996)#include #include void mainO區(qū)號char areaNumber5;電話號碼char phoneNumber12;int input:分機(jī)號char extraNumber5;用來存儲連接后的結(jié)果，需要初始化為0!char bu

41、ffer25 = 0 ;printf (請輸入?yún)^(qū)號:)；gets(areaNumber);printf (請輸入電話號碼:)；gets (phoneNumber);printf(*有分機(jī)號嗎？(y/n);input = getchar 0;/由于getchar ()只讀入一個字符，因此需要調(diào)用fflush來清除輸入緩沖區(qū)的換行符 f flush (stdin);if (input = ,y,)printfC請輸入分機(jī)號：); gets(extraNumber);strcat(buffer,areaNumber);strcat(buffer, ;strcat(buffer,phoneNumber

42、);strcat(buffer, ;strcat(buffer,extraNumber);elsestrcat(buffer, areaNumber);strcat(buffer, ;strcat(buffer,phoneNumber);printf C您的電話號碼是sn*, buffer):Strncat ()函數(shù) ffpragma warning (disable: 4996)#include#includevoid mainOchar buf 1 30;聲明字符串?dāng)?shù)組，用于保存字符串bufl.char buf230;聲明字符串?dāng)?shù)組，用于保存字符串buf2.printf(*請輸入第一個字符

43、串：”)；gets (bufl);printf(*請輸入第二個字符串：”)；gets (buf2);使用strncat ()函數(shù)來對字符串進(jìn)行拼接strncat (bufl, buf2, sizeof (bufl)-l - strlen(bufl); printf(*連接后的字符串是%s, n bufl);Atoi ()函數(shù)#pragma warning(disable:4996)#include#includevoid mainOchar buf20;int result;printf(*請輸入待轉(zhuǎn)換的十進(jìn)制數(shù)：gets (buf);result = atoi(buf);printf (轉(zhuǎn)換

44、結(jié)果迪 %d. n, result);使用函數(shù)itoa ()將整數(shù)轉(zhuǎn)換字符串pragma warning(disable:4996)#include#includevoid mainOchar buf20;用于保存八進(jìn)制的轉(zhuǎn)換結(jié)果char number_820;用于保存十進(jìn)制的轉(zhuǎn)換結(jié)果char number.l020;用于保存十六進(jìn)制的轉(zhuǎn)換結(jié)果char number6 20;int val;printf (請輸入待轉(zhuǎn)化的數(shù)：”)；gets (buf);val = atoi (buf);將輸入的字符串表示的數(shù)字轉(zhuǎn)換為整型使用提哦啊()函數(shù)進(jìn)行轉(zhuǎn)換itoa (val, number_8, 8);i

45、toa (val, number.10, 10);itoa (val, number_16, 16);printf (八進(jìn)制下為 %sn*, number_8);pidntf (十進(jìn)制下為 %sn*, number.10);prdntf (十兀進(jìn)制下為 %snr number_16);不帶參數(shù)的宏定義#include#define pl 3.141592void mainOprintf (“fn, pl);帶參數(shù)的宏定義#includedefine pl 3.14define COMP.CIR(x) 2*pl*xvoid mainOdouble r = 1. 0;printf(2*pl*r= %fnj COMP_CIR(r);宏定義中參數(shù)的替換#includeftdefine ABS(x) (x)=0 ? (x) ：-(x)double compAbs(double x)return x = 0 ? x :x;void mainOdoub