【C语言代码大全】

乘法口诀表
#include <stdio.h>
#include <conio.h>
void main(void)
{
int i,j,x,y;
clrscr();
printf("\n\n * * * 乘法口诀表 * * * \n\n");
x=9;
y=5;
for(i=1;i<=9;i++)
{
gotoxy(x,y);
printf("%2d ",i);
x+=3;
}
x=7;
y=6;
for(i=1;i<=9;i++)
{
gotoxy(x,y);
printf("%2d ",i);
y++;
}
x=9;
y= 6;
for(i=1;i<=9;i++)
{
for(j=1;j<=9;j++)
{
gotoxy(x,y);
printf("%2d ",i*j);
y++;
}
y-=9;
x+=3;
}
printf("\n\n");
}

用一维数组统计学生成绩
#include <stdio.h>
void main()
{
char SelectKey,CreditMoney,DebitMoney;
while(1)
{
do{
clrscr();
puts("=========================");
puts("| Please select key: |");
puts("| 1. Quary |");
puts("| 2. Credit |");
puts("| 3. Debit |");
puts("| 4. Return |");
puts("=========================");
SelectKey = getch();
}while( SelectKey!='1' && SelectKey!='2' && SelectKey!='3' && SelectKey!='4' );
switch(SelectKey)
{
case '1':
clrscr();
puts("================================");
puts("| Your balance is $1000. |");
puts("| Press any key to return... |");
puts("================================");
getch();
break;
case '2':
do{
clrscr();
puts("==================================");
puts("| Please select Credit money: |");
puts("| 1. $50 |");
puts("| 2. $100 |");
puts("| 3. Return |");
puts("==================================");
CreditMoney = getch();
}while( CreditMoney!='1' && CreditMoney!='2' && CreditMoney!='3' );
switch(CreditMoney)
{
case '1':
clrscr();
puts("=========================================");
puts("| Your Credit money is $50,Thank you! |");
puts("| Press any key to return... |");
puts("=========================================");
getch();
break;
case '2':
clrscr();
puts("==========================================");
puts("| Your Credit money is $100,Thank you! |");
puts("| Press any key to return... |");
puts("==========================================");
getch();
break;
case '3':
break;
}
break;
case '3':
do{
clrscr();
puts("====================================");
puts("| Please select Debit money: |");
puts("| 1. $50 |");
puts("| 2. $100 |");
puts("| 3. $500 |");
puts("| 4. $1000 |");
puts("| 5. Return |");
puts("====================================");
DebitMoney = getch();
}while( DebitMoney!='1' && DebitMoney!='2' && DebitMoney!='3' \
&& DebitMoney!='4' && DebitMoney!='5' );
switch(DebitMoney)
{
case '1':
clrscr();
puts("===========================================");
puts("| Your Debit money is $50,Thank you! |");
puts("| Press any key to return... |");
puts("===========================================");
getch();
break;
case '2':
clrscr();
puts("===========================================");
puts("| Your Debit money is $100,Thank you! |");
puts("| Press any key to return... |");
puts("===========================================");
getch();
break;
case '3':
clrscr();
puts("===========================================");
puts("| Your Debit money is $500,Thank you! |");
puts("| Press any key to return... |");
puts("===========================================");
getch();
break;
case '4':
clrscr();
puts("===========================================");
puts("| Your Debit money is $1000,Thank you! |");
puts("| Press any key to return... |");
puts("===========================================");
getch();
break;
case '5':
break;
}
break;
case '4':
clrscr();
puts("================================");
puts("| Thank you for your using! |");
puts("| Good bye! |");
puts("================================");
return;
}
}
}

模拟ATM（自动柜员机）界面
#include <stdio.h> void main()
{
int Password=0,Number=0,price=58,i=0; while( Password != 1234 )
{
if( i >= 3 )
return;
i++;
puts("Please input Password: ");
scanf("%d",&Password);
} i=0;
while( Number!=price )
{
do{
puts("Please input a number between 1 and 100: ");
scanf("%d",&Number);
printf("Your input number is %d\n",Number);
}while( !(Number>=1 && Number<=100) );
if( Number >= 90 )
{
printf("Too Bigger! Press any key to try again!\n");
}
else if( Number >= 70 && Number < 90 )
{
printf("Bigger!\n");
}
else if( Number >= 1 && Number <= 30 )
{
printf("Too Small! Press any key to try again!\n");
}
else if( Number > 30 && Number <= 50 )
{
printf("Small! Press any key to try again!\n");
}
else
{
if( Number == price )
{
printf("OK! You are right! Bye Bye!\n");
}
else if( Number < price )
{
printf("Sorry,Only a little smaller! Press any key to try again!\n"); }
else if( Number > price )
printf(" Sorry, Only a little bigger! Press any key to try again!\n");
}
getch();
}
} 

用二维数组实现矩阵转置
/* 用二维数组实现矩阵的转置 */
#include <stdio.h>
#define ROW 3
#define COL 4
main()
{
int matrixA[ROW][COL],matrixB[COL][ROW];
int i,j; clrscr();
printf("Enter elements of the matrixA,");
printf("%d*%d:\n",ROW,COL);
for( i=0; i<ROW; i++ )
{
for( j=0; j<COL; j++ )
{
scanf("%d",&matrixA[i][j]);
}
} for( i=0; i<ROW; i++ )
{
for( j=0; j<COL; j++ )
{
matrixB[j][i] = matrixA[i][j];
}
} printf("MatrixB,");
printf("%d*%d:\n",COL,ROW);
for( i=0; i<COL; i++ )
{
for( j=0; j<ROW; j++ )
{
printf("%8d",matrixB[i][j]);
}
printf("\n");
}
printf("\n Press Any Key to Quit... \n");
getch();
}

求解二维数组的最大/最小元素
#define MAXN 20
int a[MAXN][MAXN];
main()
{
int min, /* 存储最小值 */
max; /* 存储最大值 */
int row,col,n;
clrscr();
printf("Please input the order of the matrix:\n");/* 输入方阵的阶次 */
scanf("%d",&n);
printf("Please input the elements of the matrix,\n from a[0][0] to a[%d][%d]:\n",n-1,n-1);
for(row=0;row<n;row++)
for(col=0;col<n;col++)
scanf("%d",&a[row][col]);
for(min=a[0][0],row=0;row<n;row++)
{
/* 从每行选出最大数 */
for(max=a[row][0],col=1;col<n;col++)/*从row行选出最大数 */
if(max<a[row][col])
max=a[row][col];
if(min>max)/* 保存至row行的最小数 */
min=max;
}
printf("The minimum of maximum number is %d\n",min);
for(max=a[0][0],row=0;row<n;row++)
{
/* 每行选出最小数 */
for(min=a[row][0],col=1;col<n;col++)/* 从row行选出最小数 */
if(min>a[row][col])
min=a[row][col];
if(max<min)/*保存至row行的最大数 */
max=min;
}
printf("The maximum of minimum numbers is %d\n",max);
printf("\nPress any key to quit...\n");
getch();
}

编制万年历
#include "stdio.h"
long int f(int year,int month)
{/*f(年，月)＝年－1，如月<3;否则，f(年，月)＝年*/
if(month<3) return year-1;
else return year;
} long int g(int month)
{/*g(月)＝月＋13，如月<3;否则，g(月)＝月＋1*/
if(month<3) return month+13;
else return month+1;
} long int n(int year,int month,int day)
{
/*N=1461*f(年、月)/4+153*g(月)/5+日*/
return 1461L*f(year,month)/4+153L*g(month)/5+day;
} int w(int year,int month,int day)
{
/*w=(N-621049)%7(0<=w<7)*/
return(int)((n(year,month,day)%7-621049L%7+7)%7);
} int date[12][6][7];
int day_tbl[ ][12]={{31,28,31,30,31,30,31,31,30,31,30,31},
{31,29,31,30,31,30,31,31,30,31,30,31}};
main()
{int sw,leap,i,j,k,wd,day;
int year;/*年*/
char title[]="SUN MON TUE WED THU FRI SAT";
clrscr();
printf("Please input the year whose calendar you want to know: ");/*输入年*/
scanf("%d%*c",&year);/*输入年份值和掠过值后的回车*/
sw=w(year,1,1);
leap=year%4==0&&year%100||year%400==0;/*判闰年*/
for(i=0;i<12;i++)
for(j=0;j<6;j++)
for(k=0;k<7;k++)
date[i][j][k]=0;/*日期表置0*/
for(i=0;i<12;i++)/*一年十二个月*/
for(wd=0,day=1;day<=day_tbl[leap][i];day++)
{/*将第i＋1月的日期填入日期表*/
date[i][wd][sw]=day;
sw=++sw%7;/*每星期七天，以0至6计数*/
if(sw==0) wd++;/*日期表每七天一行，星期天开始新的一行*/
} printf("\n|==================The Calendar of Year %d =====================|\n|",year);
for(i=0;i<6;i++)
{/*先测算第i+1月和第i+7月的最大星期数*/
for(wd=0,k=0;k<7;k++)/*日期表的第六行有日期，则wd!=0*/
wd+=date[i][5][k]+date[i+6][5][k];
wd=wd?6:5;
printf("%2d %s %2d %s |\n|",i+1,title,i+7,title);
for(j=0;j<wd;j++)
{
printf(" ");/*输出四个空白符*/
/*左栏为第i+1月，右栏为第i+7月*/
for(k=0;k<7;k++)
if(date[i][j][k])
printf("%4d",date[i][j][k]);
else printf(" ");
printf(" ");/*输出十个空白符*/
for(k=0;k<7;k++)
if(date[i+6][j][k])
printf("%4d",date[i+6][j][k]);
else printf(" ");
printf(" |\n|");
}
/*scanf("%*c");/*键入回车输出下一个月的日历*/
}
puts("=================================================================|");
puts("\n Press any key to quit...");
getch();
}

对数组元素排序
rest(int a[], int n)
{
int i,low,high,t; for(i=0,low=0,high=n-1;i<=high;)
{
if(a[i]>0)
{
/*a[i]与a[high]交换，随之high减1*/
t=a[i];
a[i]=a[high];
a[high]=t;
high--;
}
else if(a[i]==0)
i++; /* 掠过该元素 */
else
{
/*a[i]与a[low]交换，随之low增1, i增1*/
t=a[i];
a[i]=a[low];
a[low]=t;
low++;
i++;
}
}
}
int s[]={8,4,0,-1,6,0,-5};
main()
{
int i;
clrscr();
printf("\n The arry before rest is:\n");
for(i=0;i<sizeof(s)/sizeof(s[0]);i++)
printf("%4d",s[i]);
rest(s,sizeof(s)/sizeof(s[0]));
printf("\n The arry after rest is:\n");
for(i=0;i<sizeof(s)/sizeof(s[0]);i++)
printf("%4d",s[i]);
printf("\n Press any key to quit...\n");
getch();
}

任意进制数的转换
/* 函数trans将无符号整数n翻译成d（2<＝d<＝16）进制表示的字符串s */
#define M sizeof(unsigned int)*8
int trans(unsigned n, int d, char s[])
{
static char digits[] ="0123456789ABCDEF"; /* 十六进制数字的字符 */
char buf[M+1];
int j, i = M;
if(d<2||d>16)
{
s[0]='\0'; /* 不合理的进制，置s为空字符串 */
return 0; /* 不合理的进制，函数返回0 */
}
buf[i]='\0';
do
{
buf[--i]=digits[n%d]; /*译出最低位，对应字符存入对应工作数组中*/
n/=d;
}while(n);
/* 将译出在工作数组中的字符串复制到s */
for(j=0;(s[j]=buf[i])!='\0';j++,i++);
/* 其中控制条件可简写成s[j]=buf[i] */
return j;
}
/* 主函数用于测试函数 trans() */
main()
{
unsigned int num = 253;
int scale[]={2,3,10,16,1};
char str[33];
int i;
clrscr();
for(i=0;i<sizeof(scale)/sizeof(scale[0]);i++)
{
if(trans(num,scale[i],str))
printf("%5d = %s(%d)\n",num,str,scale[i]);
else
printf("%5d => (%d) Error! \n",num,scale[i]);
}
printf("\n Press any key to quit...\n");
getch();
}

第二期不久之后更新，尽请期待。

求解钢材切割的最佳订单
#include <stdio.h>
#define N 20
#define DELTA 2
int bestlen;
int bestsele[N];
int sele[N];
int n;
int orderlen[N];
int total;
main()
{
int i;
clrscr();
printf("\n Please enter total length of the steel:\n");/* 输入钢材总长 */
scanf("%d",&total);
printf("\n Please enter number of order:\n"); /* 输入定单数 */
scanf("%d",&n);
printf("\n Please enter the orders:\n"); /* 输入各定单 */
for(i=0;i<n;i++)
scanf("%d",&orderlen[i]);
bestlen=0; /*最佳解用料的初值 */
for(i=0;i<n;i++)
sele[i]=bestsele[i]=0; /*置当前选择和最佳选择初值 */
try(); /* 调用函数求解 */
for(i=0;i<n;i++) /* 输出结果 */
if(bestsele[i])
printf("order %d length = %d\n",i+1,orderlen[i]);
printf("\n Press any key to quit...");
getch();
}
try()
{
int i,len;
for(len=i=0;i<n;i++) /* 求当前选中的用料量 */
if(sele[i])
len+=orderlen[i]+DELTA;
if(len-DELTA<=total) /* 注意最后一段可能不需要切割 */
{
if(bestlen < len)
{
/* 找到一个更好的解 */
bestlen = len;
for(i=0;i<n;i++)
bestsele[i]=sele[i];
}
for(i=0;i<n;i++) /* 对所有未选定单逐一作选中尝试循环 */
if(!sele[i])
{
sele[i]=1; /* 做选中尝试*/
try();
sele[i]=0;
}
}
} 

指向数组的指针
main()
{
int x,y,z; /* 定义三个int型变量 */
int *xp = &x, /* 定义指针变量xp,并赋值为x的地址，使xp指向x */
*yp = &y, /* 定义指针变量yp,并赋值为y的地址，使yp指向y */
*zp = &z; /* 定义指针变量zp,并赋值为z的地址，使zp指向z */
int t;
clrscr();
printf("\nPlease input x,y,z:\n");
scanf("%d%d%d",xp,yp,zp); /* 通过变量的指针，为变量输入值 */
if(*xp>*yp) /* 通过指向变量的指针引用变量的值 */
{
t=*xp; /* 通过指向变量的指针引用变量的值 */
*xp=*yp;/* 通过指向变量x的指针xp,引用变量x的值 */
*yp=t; /* 通过指向变量y的指针yp,引用变量y的值 */
}
if(*xp>*zp) /* 通过指向变量的指针,引用变量的值 */
{
t=*xp; /* 通过指向变量x的指针xp,引用变量x的值 */
*xp=*zp;/* 通过指向变量x的指针xp,引用变量x的值 */
*zp=t; /* 通过指向变量z的指针zp,引用变量z的值 */
}
if(*yp>*zp) /* 通过指向变量的指针,引用变量的值 */
{
t=*yp; /* 通过指向变量的指针,引用变量的值 */
*yp=*zp;/* 通过指向变量y的指针yp,引用变量y的值 */
*zp=t;/* 通过指向变量z的指针zp,引用变量z的值 */
}
printf("x = %d\ty = %d\tz = %d\n",x,y,z);
printf("\nPress any key to quit...\n");
getch();
}

扑克牌的结构表示
enum suits{CLUBS,DIAMONDS,HEARTS,SPADES};
struct card
{
enum suits suit;
char value[3];
};
struct card deck[52];
char cardval[][3]={"A","2","3","4","5","6","7","8","9","10","J","Q","K"};
char suitsname[][9]={"CLUBS","DIAMONDS","HEARTS","SPADES"}; main()
{
int i,j;
enum suits s;
clrscr();
for(i=0;i<=12;i++)
for(s=CLUBS;s<=SPADES;s++)
{
j=i*4+s;
deck[j].suit=s;
strcpy(deck[j].value,cardval[i]);
}
for(j=0;j<52;j++)
printf("(%s%3s)%c",suitsname[deck[j].suit],deck[j].value,j%4==3?'\n':'\t');
puts("\nPress any key to quit...");
getch();
}


报数游戏
#include <stdio.h>
struct ele{
int no;
struct ele *link;
}
main()
{
int n,m,i;
struct ele *h,*u,*p;
clrscr();
printf("Please input n&m:\n");
scanf("%d%d",&n,&m);/*输入n和m*/
h=u=(struct ele *)malloc(sizeof(struct ele));/*形成首表元*/
h->no=1;
for(i=2;i<=n;i++)/*形成其余的n-1个表元*/
{
u->link=(struct ele *)malloc(sizeof(struct ele));
u=u->link;
u->no=i;/*第i个表元置编号i*/
}
u->link=h;/*末表元后继首表元，形成环*/
puts("\nThe numbers of who will quit the cycle in turn are:");
while(n)
{
for(i=1;i<m;i++)/*掠过m－1个表元*/
u=u->link;
p=u->link;/*p指向第m个表元*/
u->link=p->link;/*第m个表元从环中脱钩*/
printf("%4d",p->no);
free(p);/*释放第m个表元占用的空间*/
n--;
}
printf("\n\n Press any key to quit...\n");
getch();
}


struct node *makelist(char *fname)
{
FILE *fp;
struct record s;
struct node *p,*u,*v,*h;
int i;
if((fp=fopen(fname,"r"))==NULL)
{
printf("Can't open file %s.\n",fname);
return NULL;
}
h=NULL;
p=(struct node *)malloc(sizeof(struct node));
while(readrecord(fp,(struct record *)p)!=0)
{
v=h;
while(v&&p->total<=v->total)
{
u=v;
v=v->next;
}
if(v==h)
h=p;
else
u->next=p;
p->next=v;
p=(struct node *)malloc(sizeof(struct node));
}
free(p);
fclose(fp);
return h;
} /* 顺序显示链表各表元 */
void displaylist(struct node *h)
{
while(h!=NULL)
{
displaystu((struct record *)h);
printf("\n Press ENTER to continue...\n");
while(getchar()!='\n');
h=h->next;
}
return;
}
/* 按学生姓名查找学生记录 */
int retrievebyn(char *fname, char *key)
{
FILE *fp;
int c;
struct record s;
if((fp=fopen(fname,"r"))==NULL)
{
printf("Can't open file %s.\n",fname);
return 0;
}
c=0;
while(readrecord(fp,&s)!=0)
{
if(strcmp(s.name,key)==0)
{
displaystu(&s);
c++;
}
}
fclose(fp);
if(c==0)
printf("The student %s is not in the file %s.\n",key,fname);
return 1;
} /* 按学生学号查找学生记录 */
int retrievebyc(char *fname, char *key)
{
FILE *fp;
int c;
struct record s;
if((fp=fopen(fname,"r"))==NULL)
{
printf("Can't open file %s.\n",fname);
return 0;
}
c=0;
while(readrecord(fp,&s)!=0)
{
if(strcmp(s.code,key)==0)
{
displaystu(&s);
c++;
break;
}
}
fclose(fp);
if(c==0)
printf("The student %s is not in the file %s.\n",key,fname);
return 1;
} main()
{
int i,j,n;
char c;
char buf;
FILE *fp;
struct record s;
clrscr();
printf("Please input the students marks record file's name: ");
scanf("%s",stuf);
if((fp=fopen(stuf,"r"))==NULL)
{
printf("The file %s doesn't exit, do you want to creat it? (Y/N) ",stuf);
getchar();
c=getchar();
if(c=='Y'||c=='y')
{
fp=fopen(stuf,"w");
printf("Please input the record number you want to write to the file: ");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("Input the student's name: ");
scanf("%s",&s.name);
printf("Input the student's code: ");
scanf("%s",&s.code);
for(j=0;j<SWN;j++)
{
printf("Input the %s mark: ",schoolwork[j]);
scanf("%d",&s.marks[j]);
}
writerecord(fp,&s);
}
fclose(fp);
}
}
fclose(fp);
getchar();
/*clrscr();*/
puts("Now you can input a command to manage the records.");
puts("m : mean of the marks.");
puts("t : total of the marks.");
puts("n : search record by student's name.");
puts("c : search record by student's code.");
puts("l : list all the records.");
puts("s : sort and list the records by the total.");
puts("q : quit!");
while(1)
{
puts("Please input command:");
scanf(" %c",&c); /* 输入选择命令 */
if(c=='q'||c=='Q')
{
puts("\n Thank you for your using.");
break; /* q，结束程序运行 */
}
switch(c)
{
case 'm': /* 计算平均分 */
case 'M':
if((n=totalmark(stuf))==0)
{
puts("Error!");
break;
}
printf("\n");
for(i=0;i<SWN;i++)
printf("%-15s's average is: %.2f.\n",schoolwork[i],(float)total[i]/n);
break;
case 't': /* 计算总分 */
case 'T':
if((n=totalmark(stuf))==0)
{
puts("Error!");
break;
}
printf("\n");
for(i=0;i<SWN;i++)
printf("%-15s's total mark is: %d.\n",schoolwork[i],total[i]);
break;
case 'n': /* 按学生的姓名寻找记录 */
case 'N':
printf("Please input the student's name you want to search: ");
scanf("%s",buf);
retrievebyn(stuf,buf);
break;
case 'c': /* 按学生的学号寻找记录 */
case 'C':
printf("Please input the student's code you want to search: ");
scanf("%s",buf);
retrievebyc(stuf,buf);
break;
case 'l': /* 列出所有学生记录 */
case 'L':
liststu(stuf);
break;
case 's': /* 按总分从高到低排列显示 */
case 'S':
if((head=makelist(stuf))!=NULL)
displaylist(head);
break;
default: break;
}
}
}