c语言几个小编程.doc

选择排序：#include int main(void)int i,index,k,n,temp;int a10;printf(“Enter n:”);scanf(%d”,&n);printf(“Enter %d integers:”,n);for(i=0;in;i+)scanf(“%d”,&ai);for(k=0;kn-1;k+)index=k;for(i=k+1;in;i+)if(aiaindex) index=i;temp=aindex;aindex=ak;ak=temp;printf(“After sorted:”);for(i=o;in;i+)printf(“%d”,ai);printf(“n”);return 0;冒泡排序:#includevoid swap2(int *,int *);void bubble(int a ,int n);int main(void)int n,a8;int i;printf(“Enter n(n=8):”);scanf(“%d”,&n);printf(“Enter a%d:”,n);for(i=0;in;i+)scanf(“%d”,&ai);bubble(a,n);printf(“After sorted,a%d=”,n);for (i=0;in;i+)printf(“%3d”,ai);return 0;void bubble(int a ,int n)int i,j;for(i=1;in;i+)for(j=0;jaj+1)swap2(&aj,&aj+1);void swap2(int *px,int *py)int t;t=*px;*px=*py;*py=t;判断字符数:#includeint main(void)int digit,i,letter,other;char ch;digit=letter=other=0;printf(“Enter 10 characters:”);for(i=1;i=a&ch=a&ch=0&ch=9)digit +;elseother +;printf(“letter=%d,digit=%d,other=%dn”,letter,digit,other);return 0;手机通讯录:#include#includestruct frinds_listchar name10;int age;char telephone13;int Count=0;void new_friend(struct friends_list friends );void search_friend(struct friends_list friends ,char*name);int main(void)int choice;char name10;struct friends_list friends50;doprintf(“手机通讯录功能选项:1:新建 2:查询 0:退出n”);printf(“请选择功能:”);scanf(“%d”,&choice);switch(choice);case 1:new_friend(friends);break;case 2:printf(“请输入要查找的联系人姓名:”);scanf(“%s”,name);search_friends,name);break;case 0:break;while(choice!=0);printf(“谢谢使用通讯录功能!n”);return 0;void new_friend(struct friends_list friends )struct friends_list f;if(Count=50)printf(“通讯录已满!n”);return;printf(“强输入新联系人的姓名:”);scanf(“%s”,);printf(“请输入新联系人的年龄:”);scanf(“%d”,&f.age);printf(“请输入新联系人的联系电话:”);scanf(“%s”,f.telephone);friendsCount=f;Count +;void search_friend(struct friends_list friends ,char *name)int i,flag=0;if(Count=0)printf(“通讯录时空的!n”);return;for(i=0;iCount;i+)if(strcmp(name,)=0)flag=1break;if(flag)printf(“姓名:%st”,);printf(“年龄:%dt”,friendsi.age);printf(“电话:%sn”,friendsi.telephonr);elseprintf(“无此联系人!”);水仙花数：#include int main(void) int a,b,c; for(a=1;a=9;a+) for(b=0;b=9;b+) for(c=0;c=9;c+) if(100*a+10*b+c=a*a*a+b*b*b+c*c*c) printf(%d%d%dn,a,b,c); return 0;判断素数：#includeint main(void) int i,m; printf(“Enter a number:”); scanf(“%d”,&m); for(i=2;im/2) printf(“%d is a prime number!n”,m); else printf(“No!n”); return 0;分段计算水费:else-if语句:#includeint main(void)double x,y;printf(“Enter x:”);scanf(“%lf”,&x);if(x0)y=0;else if(x=15)y=4*x/3;elsey=2.5*x-10.5;printf(“f(%.2f)=%.2fn”,x,y);return 0;自动售货机:switch语句:#includeint main(void)int choice,i;double price;for(i=1,j=5;i+)ptintf(“1 Select crisps n”);ptintf(“2 Select popcorn n”);ptintf(“3 Select chocolate n”);ptintf(“4 Select cola n”);printf(“0 exit n”);printf(“Enter choice:”);scanf(“%d”,&choice);if(choice=0)break;switch(choice)case1:price=3.0,break;case2:price=2.5,break;case3:price=4.0,break;case4:price=3.5,break;default:price=0.0;break;printf(“price=%0.1fn”,price);printf(“Thanksn”);return 0;循环求:while语句#include#includeint main(void)int denominator,flag;double item,pi;flag=1;denominator=1;item=1.0;pi=0;while(fabs(item)=0.0001)item=flag*10./denominator;pi=pi+item;flag=-flag;denominator=denominator+2;pi=pi*4;printf(“pi=%.4fn,pi);return 0;统计整数位数:do-while:#includeint main(void)int count,number:count=0;print(“Enter a number:”);scanf(“%d”,&number);if(number0number=-number;donumber=number/10;count +;while(number!=0);printf(“It contains %d digits.n”,count);return 0;求阶乘和:for语句:#includedouble fact(int n);int main(void)int i;doubleb sum;sum=0;for(i=1;i=100;i+)sum=sum+fact(i);printf(“1!+2!+.+100!=%en”,sum);return 0;double fact(int n)int i;double result;result=1;for(i=1;i=n;i+)result=result*it;return result;嵌套循环求阶乘和:#includevoid main()int i,j;double item,sum;sum=0;for(i=1;i=100;i+)item=1;for(j=1;j=i;j+)item=item*j;sum=sum+item;printf(“1!+2!+.+100!=%en”,sum);return 0;计算日期：数组int day_of_year(int year,int mounth,int day)int k,leap;int tab213=0,31,28,31,30,31,30,31,31,30,31,30,310,31,29,31,30,31,30,31,31,30,31,30,31;leap=(year%4=0&year%100!=0|year%400=0);for(k=1;kmonth;k+)day=day+tableapk;return day;完整的函数定义涉及函数头和函数体。函数是一个完成特定工作的独立程序模块,包括库函数和自定义函数两种.函数的定义包括函数首部和函数体两部分,其中函数首部由函数类型、函数名和形参表组成；函数体包括一对大括号内的若干条语句，体现函数的实现过程，并用return语句返回运算的结果。标识符：以字母、下划线、数字开头的字母、数字、下划线的组合参数可以使常量、变量和表达式函数定义中的参数成为形参，函数调用时的参数称为实参。形参和实参必须一一对应，要求两者数量相同，类型一致。在参数传递过程中，将实参的值复制给形参。C语言要求函数先定义后调用，将主调函数放在被调函数的后面。函数声明的目的主要是说明函数的类型和参数的情况，以保证程序编译时能判断对该函数的调用是否正确。C语言中吧定义在函数内部的变量正为局部变量，局部变量的有效作用范围局限于所在的函数内部。定义在函数外而不属于任意