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IP屬地：貴州 上傳時間：2022-03-05 格式：DOC 頁數(shù)：34 大?。?97KB 積分：20 舉報 版權申訴

1、精選優(yōu)質(zhì)文檔-傾情為你奉上數(shù)組的引用：#include<stdio.h>void main (int argc,char *argv )int x5 = 2,3,1,4,6 ;int i;for (i = 0; i < 5; i+)printf("%dn", 2 * xi);一維數(shù)組的遍歷：#include<stdio.h>void 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"

2、, i, xi);一維數(shù)組的最值：#include<stdio.h>int main(int argc, char* argv)int x5 = 1,2,3,4,5 ;int nMax = x0;int i = 0;for (i = 1; i < 5; i+)if (xi > nMax)nMax = xi;printf("max:%dn", nMax);return 0;一維數(shù)組排序：#include<stdio.h>void main(int argc, char * argv)int arr5 = 9, 8, 3, 5, 2 ;int

3、 temp = 0;int i, j;printf("冒泡排序前： n");for (i = 0; i < 5; i+)printf("%d ", arri);printf(" n");for (i = 0; i < 5-1; i+)for (j = 0; j < 5 - 1 - i; j+)if (arrj > arrj + 1) temp = arrj;arrj = arrj + 1;arrj + 1 = temp; printf("冒泡排序后： n"); for (i = 0; i &

4、lt; 5; i+) printf("%d ", arri); printf("n");二維數(shù)組的遍歷#include<stdio.h>void main()/聲明并初始化數(shù)組int array34 = 1,2,3,4,5,6,7,8,9,10,11,12 ;for (int i = 0; i < 3; i+)/循環(huán)遍歷行for (int j = 0; j < 4; j+)/循環(huán)遍歷列printf("%d%d: %d ", i, j, arrayij);printf("n");/每一行的末尾

5、添加換行符二維數(shù)組應用#include <stdio.h>void main(int argc, char * argv)int StuScore53 = /張同學88,70,90,/王同學80,80,60,/李同學89,60,85,/趙同學80,75,78,/周同學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 =

6、 0; m < 5; m+)nStuTotalScore = 0;for (n = 0; n < 3; n+)nStuTotalScore += StuScoremn;switch (n)case 0:nMathTotalScore += StuScorem0;break;case 1:nChineseTotalScore += StuScorem1;break;case 2:nEnglishTotalScore += StuScorem2;switch (m)case 0:printf("張同學：%dn", nStuTotalScore);break;case

7、 1:printf("王同學：%dn", nStuTotalScore);break;case 2:printf("李同學：%dn", nStuTotalScore);break;case 3:printf("趙同學：%dn", nStuTotalScore);break;case 4:printf("周同學：%dn", nStuTotalScore);break;printf("小組數(shù)學總分：%d 小組數(shù)學平均分：%.2fn",nMathTotalScore, (double)nMathTot

8、alScore / 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 <stdio.h>void func()printf("這是我的第一個函數(shù)！n");void main()func();有參函數(shù)調(diào)用無參

9、函數(shù)#include <stdio.h>void func(int x, int y)int sum = x + y;printf("x+y=%dn", sum);void main()func(3, 5);函數(shù)調(diào)用及返回過程#include<stdio.h>int func(int x, int y)return x + y;void main()int sum = func(3, 5);printf("x+y=%dn", sum);Printf函數(shù)#include<stdio.h>void main()printf

10、("%c %c", 'H', 'n');printf("%s", "Hellow,world!n");printf("%d %d %d n",1, 2, 3);printf("%f %f %f n",2.1, 2.2);Scanf 函數(shù)#include<stdio.h>void main()char str256; /字符數(shù)組保存得到的字符串scanf("%s", str);printf("%sn", str);

11、嵌套函數(shù)#include<stdio.h>int 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 main()int a = 5, b = 7, c = 9, d = 22, max;printf("請輸入四個整數(shù): 5 7 9

12、22 n");/scanf("%d %d %d %d", 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<stdio.h>/下面的函數(shù)使用遞歸實現(xiàn)，求1n的和int getsum(int n)if (n = 1)return 1; /滿足條件，遞歸結束int temp = getsum(n - 1); /在函數(shù)體中調(diào)用自身return temp + n;void main()int sum = getsum(4);/調(diào)用

13、遞歸函數(shù)，獲得14的和printf("sum=%dn", sum); /打印結果外部函數(shù)建立源文件first.cint add(int x, int y)return x + y;建立源文件second.c#include<stdio.h>extern int add(int x, int y);void main()printf("%dn", add(1, 2);/注：extern 可以省略內(nèi)部函數(shù)用法建立first.c#include<stdio.h>void show()printf("%sn", &qu

14、ot;first.c");建立second.c#include<stdio.h>static void show()printf("%sn", "second.c");void main()show();全局變量#include<stdio.h>int x = 123;void show()printf("show()函數(shù)中，x的值為：%dn", x);void main()show();printf("main()函數(shù)中，x的值為：%dn",x);當局部變量與全局變量重名時，全局

15、變量會被屏蔽#include<stdio.h>int x = 789;void main()int x =123;printf("x的值為：%dn",x);變量的作用域#include<stdio.h>int x = 10;void show()int x = 20;printf("show()函數(shù)中，x的值為：%dn", x);void main()int x = 30;printf("main()函數(shù)中，x的值為%dn", x);show();If 語句 #include<stdio.h>voi

16、d main()/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("x=%dn", x);If.else語句#include<stdio.h>void main()int 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 if.else語句#include<stdio.h>void main()int gr

17、ade = 75;/定義學生成績if (grade >= 80)/滿足條件grsde >= 80printf("該成績的等級為優(yōu)n");else if (grade >= 70)/不滿足條件grade >=80,但滿足條件grade>=70printf("該成績等級為良n");else if (grade >= 60)/不滿足條件 grade >=70,但滿足條件grade >=60printf("該成績等級為中n");else/不滿足條件 grade >=60printf(&qu

18、ot;該成績的等級為差n");三元運算符#include<stdio.h>void main()int x = 0;int y = 1;int max;max = x > y ? x : y;printf("max = %dn");Switch 語句#include<stdio.h>void main()int week = 5;switch (week)case 1:printf("星期一n");break;case 2:printf("星期二n");break;case 3:printf(&

19、quot;星期三n");break;case 4:printf("星期四n");break;case 5:printf("星期五n");break;case 6:printf("星期六n");break;case 7:printf("星期日n");break;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#include<stdio.h>void m

20、ain()int week = 2;switch (week)case 1:case 2:case 3:case 4:case 5:/當week滿足值1、2、3、4、5中任意一個時，處理方式相同printf("今天是工作日n");break;case 6:case 7: /當week滿足值6、7中任意一個時，處理方式相同printf("今天是休息日n");break;While 循環(huán)語句#include<stdio.h>void main()int x = 1;while (x <= 4)printf("x = %dn&quo

21、t;, x);/條件成立，打印x的值x+; /x進行自增Do-while 循環(huán)語句#include<stdio.h>void main()int 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+; /x進行自增 while (x <= 4); /循環(huán)條件For 循環(huán)#include<stdio.h>void main()int 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+; /x進行自增 while (x

22、<= 4); /循環(huán)條件Break 語句#include<stdio.h>void main()int 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+; /x進行自增 Goto語句#include<stdio.h>int main() int i, j; /定義兩個循環(huán)變量for (i = 1; i <= 9; i+) /外層循環(huán)for (j = 1; j <= i; j+) /內(nèi)層循環(huán)if (i >4) /判斷i的

23、值是否大于4goto end; /跳至標志位end的語句printf("*"); /輸出*printf("n"); /換行end: return 0;Continue 語句#include<stdio.h>void main()int sum = 0; /定義變量sum，用于記住和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; /結束本次循環(huán)sum += i; /實現(xiàn)sum和i的累加printf("sum = %dn"

24、, sum);無符號整數(shù)類型#include<stdio.h>void main()int a = 12345;long b = -23456, sum1;unsigned int c = 32800, sum2;sum1 = b - a;sum2 = c - b;printf("sum1=%1d,sum2=%un", sum1, sum2);Float 和double之間的數(shù)據(jù)轉換#include<stdio.h>void main()float a;a = 3.;printf("a=%.9fn", a);字符型變量#inclu

25、de<stdio.h>void main()char ch1 = 'A'char ch2 = 65;printf("%cn", ch1);printf("%cn", ch2);#include<stdio.h>void main()轉義符的用法char ch1 = 'A'char ch2 = 'n'char ch3 = 'B'char ch4 = ''printf("%c", ch1);printf("%c",

26、ch2);printf("%c", ch3);printf("%c", ch4);printf("%c", ch2);枚舉類型變量#include<stdio.h>enum month JAN=1,FEB=2,MAR=3,APR=4,MAY=5,JUN=6, JUL=7,AUG=8,SEP=9,OCT=10,NOV=11,DEC=12;void main()enum month lastmonth, thismonth, nextmonth;lastmonth = APR;thismonth = MAY;nextmonth

27、 = JUN;printf("%d %d %d n", lastmonth, thismonth, nextmonth); 在枚舉中規(guī)定，如果不給標識符指定具體值，會默認該標識符的值等于前一標識符的值加一。因此可以快速定義#include<stdio.h>/定義一組常量enum Constants c1, c2, c3 = 4, c4, c5 = 3, c6, c7, c8 = '0', c9 ;void main()printf("c9=%dn", c9);Sizeof 運算符#include <stdio.h>

28、void main()/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: %dn", sizeof(char);printf("short: %dn", sizeof(short);printf("long: %dn", sizeof(long);printf("float: %dn", sizeof(float);printf("double: %dn", sizeof(double);printf("unsigned char: %dn", sizeo

29、f(unsigned char);printf("unsigned short: %dn", sizeof(unsigned short);printf("unsigned int: %dn", 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 val_int = 100;double val_double = .0;printf("val_int: %dn", siz

30、eof(val_int);printf("val_double: %dn", sizeof(val_double);指針的取址和取值運算符#include<stdio.h>void main()int num = 100; /int類型變量numprintf("num=%dn", num); /輸出變量值printf("#&num = %pn", &num); /輸出變量的內(nèi)存地址printf("*&num = %dn", *&num); /通過num地址讀取num中的數(shù)

31、據(jù)指針表達式的自增自減運算#include<stdio.h>void main()int arr5 = 1,2,3,4,5 ;int *p1 = &arr0;int *p2 = &arr3;printf("p1的值為： %dn", *p1);printf("+p1的值為： %dn", *(+p1);printf("p2的值為： %dn", *p2);printf("-p2的值為: %dn", *(-p2);同類指針相減運算#include<stdio.h>void main(

32、)int arr5 = 1,2,3,4,5 ;int *p1 = &arr0;int *p2 = &arr3;printf("p1的值為： %dn", p1);printf("p2的值為： %dn", p2);printf("p1-p2的值為: %dn", p2-p1);指針變量的使用#include<stdio.h>void main(int argc,char* argv)int nNum = 0x;int * pNum; /定義一個指針變量pNum = &nNum; /為指針變量賦值print

33、f("nNum Val:%xn", nNum);printf("nNum Addr:%pn", &nNum);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）#include<stdio.h>void main(int argc,char* argv)int nNum = 0x;int * pNum; /定義一個指針變量pNum = &nNum; /為指針變

34、量賦值printf("nNum Val:%xn", nNum);printf("nNum Addr:%pn", &nNum);printf("pNum Val:%pn", pNum);printf("*pNum :%xn", *pNum);指向一維數(shù)組元素的指針#include<stdlib.h>#include<stdio.h>void main(int argc, char* argv)int X10 = 1,2,3,4,5,6,7,8,9,10 ;int i = 0;int n

35、Len = 10;printf("數(shù)組X修改前：n");for (i = 0; i < 10; i+)printf("%d ", Xi);/用指針pTemp 指向數(shù)組Xint * pTemp = 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+)pTempi = pTempi * 2;printf("n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 ", *pT

36、emp);pTemp+;printf("n");指向二維數(shù)組元素的指針#include<stdlib.h>#include<stdio.h>void main()int X25 = 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 < 2; m+)printf("第%d行的元素如下： n", m + 1);for (n = 0

37、; n < 5; n+)/通過數(shù)組指針來訪問為數(shù)組中的元素printf(" %d", pXElementmn);printf("n"); 指針數(shù)組的概念#include<stdio.h>/輸出指針數(shù)組中元素的值int print(int *arr, int n)if (!arr)return 0;int i = 0;for (i = 0; i<n; i+)printf("%dn", *arri);return 1;void main(int argc, char * argv)int a, b, c, d, e

38、;a = 1;b = 2;c = 3;d = 4;e = 5;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main（）函數(shù)的形參#include<stdlib.h>#include<stdio.h>int 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(&quo

39、t;%s ", argvi);return 0;二級指針#include<stdlib.h>#include<stdio.h>void 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 = %dn", m);printf("*pM = %dn", *pM);printf("*pM = %dn", *ppM);M

40、alloc()函數(shù)和free（）函數(shù)#include<stdio.h>void main()int u, v; /定義二維數(shù)組的長和寬printf("第一維為：");scanf("%d", &u);printf("第二維為：");scanf("%d", &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

41、(sizeof(int)*v);for(int j = 0; j<v; j+)arrayij = 0; /給數(shù)組元素復制printf("%d ", arrayij);字符數(shù)組#include<stdio.h>void main()/聲明一個字符數(shù)組并初始化char char_array5 = 'h', 'e', 'l', 'l', 'o' ;int i;/通過sizeof關鍵字得到數(shù)組長度，并遍歷打印其內(nèi)容。for (i = 0; i < sizeof(char_arra

42、y); +i)printf("%c", char_arrayi);printf("n");輸出字符串中的字符#include<stdio.h>void main()char char_array6 = ("hello");/聲明一個長度為6的字符數(shù)組并初始化為helloint i;/通過sizeof關鍵字得到數(shù)組長度for (i = 0; i < sizeof(char_array); +i)/通過printf輸出char_array中的字符串printf("char_array的第%dn", i

43、, char_arrayi);獲取用戶輸入字符的長度#define _CRT_SECURE_NO_WARNINGS /關閉安全檢查#include<stdio.h>#include<string.h>void main()char str1024; /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:");scanf("%s", str); /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0的使用#include<s

44、tdio.h>void main()char char_array = 'h', 'e', 'l', 'l', 'o', '0', 'w', 'o', 'r', 'l', 'd' ;printf "%sn", char_array ;忘記在字符數(shù)組的末尾添加空字符0，程序也會出現(xiàn)一些奇怪的現(xiàn)象#include<stdio.h>void main()char char_array =

45、'h', 'e', 'l', 'l', 'o' ;printf "%sn", char_array ;使用指針修改字符串中的字符#include<stdio.h>int main()char char_array = "hello world!"char *ptr;printf("修改前的字符串如下：%sn", char_array);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

46、串while (*ptr != '0') /檢測是否到串未尾if (*ptr = ' ')*ptr = '!'ptr+;printf("修改后的字符串如下：%s n", char_array);return 0;Gets（）函數(shù)#pragma warning(disable:4996)#include<stdio.h>void main()char phoneNumber12;printf("請輸入手機號碼：");gets(phoneNumber);printf("您的手機號碼是: %

47、sn", phoneNumber);Puts（）#pragma warning(disable:4996)#include<stdio.h>void main()char buf12;puts("請輸入一個字符串：");gets(buf);puts("您輸入的是: n");puts(buf);字符串比較#pragma warning(disable:4996)#include<stdio.h>#include<string.h>void main()char username100; /定義存放用戶名的字符數(shù)

48、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("用戶 %s 登錄成功！n"

49、;, username);elseprintf("登陸失敗，請檢查用戶名或密碼是否正確輸入。n");Strncmp（）函數(shù)#include<string.h>#include<stdio.h>void main()char* str1 = "abcdef"char* str2 = "abcdeg"/判斷字符串str1和str2中的前5個字符是否相同if (!strncmp(str1, str2, 5)printf("str1和str2的前5個字符相同");elseprintf("s

50、tr1和str2的前5個字符不同");Strchr（）函數(shù)#include<stdio.h>#include<string.h>int getcount(char* str, char c)/存儲找到的字符個數(shù)int count = 0;/存儲當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 main() char str6 = "abaca"char c = &

51、#39;a'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)#pragma warning(disable:4996)#include<stdio.h>#include<string.h>void main()char str10240; /聲明字符串數(shù)組，用于保存段落char word10240; /聲明字符串數(shù)組，用于保存要查找的字符串char* ptr;printf("請輸入要掃描的段落：");gets(str);pri

52、ntf("請輸入要查找的單詞：");gets(word);ptr = strstr(str, word); /搜索是否包含指定的字符串if (ptr = NULL)printf("段落中不包含單詞 %s。n", word);else/得到檢測出的字符串后20個字符if (strlen(ptr) >= 20)ptr20 = 0;printf("單詞出現(xiàn)在 %s附近。n", ptr);Strcat（）函數(shù)#pragma warning(disable:4996)#include<stdio.h>#include<s

53、tring.h>void main()/區(qū)號char areaNumber5;/電話號碼char phoneNumber12;int input;/分機號char extraNumber5;/用來存儲連接后的結果，需要初始化為0！char buffer25 = 0 ;printf("請輸入?yún)^(qū)號:");gets(areaNumber);printf("請輸入電話號碼:");gets(phoneNumber);printf("有分機號嗎？（y/n)");input = getchar();/由于getchar（）只讀入一個字符，因此

54、需要調(diào)用fflush來清除輸入緩沖區(qū)的換行符fflush(stdin);if (input = 'y')printf("請輸入分機號：");gets(extraNumber);strcat(buffer, areaNumber);strcat(buffer, "-");strcat(buffer, phoneNumber);strcat(buffer, "-");strcat(buffer, extraNumber);elsestrcat(buffer, areaNumber);strcat(buffer, "-");strc