1. c語言編程
#include<stdio.h>
#include<stdlib.h>
intmain()
{
chars2[100];//這個數自己設置
charc=' ';
printf("pleaseinputstring: ");
//建立輸出文件
FILE*fp=fopen("d:\wen1.txt","w");
if(fp==NULL)
{
printf("filecreatedfailed!");
exit(1);
}
//循環檢查是不是小寫字母,是,則寫入文件
while(scanf("%c",&c))
{
if(c=='!')
{
break;
}
if(c>='a'&&c<='z')
{
fprintf(fp,"%c",c);
}
}
fclose(fp);
//建立輸入文件
fp=fopen("d:\wen1.txt","r");
if(fp==NULL)
{
printf("filecreatedfailed!");
exit(2);
}
char*readResult;
while((readResult=fgets(s2,100,fp))!=NULL)
{
printf("%s ",s2);
}
fclose(fp);
}
2. 用c語言編程
程序就是讀取文件到數組，再將數組進行排序，最後寫入文件。
讀寫文件流程：fopen獲取文件流(根據讀寫需求，選擇參數，使用完必須調用fclose函數關閉)，fscanf讀取文件內容，fseek控制文件流指針，fprintf寫入文件。
選擇排序：每個循環周期選出一個最值，交換一次。
下面是代碼（數組為動態數組）：
#include <stdio.h>
#include <malloc.h>
int maxLen;//數組長度
int *read2Nums(char path[]);//讀取
int write2File(int *nums,char path[]);//寫入
void showNums(int *nums);
int px(int *nums,int flag);//選擇排序flag=1升序，flag=0降序
int main()
{
int *nums=NULL;
char rPath[]="c:\000.dat",wPath[]="c:\rank.dat";
if(!(nums=read2Nums(rPath))) return 1;
showNums(nums);
printf("數組升序排列： ");
if(px(nums,1)==-1) return 1;
showNums(nums);
printf("數組降序排列： ");
if(px(nums,0)==-1) return 1;
showNums(nums);
printf("寫入到文件路徑%s下（存在覆蓋，不存在新建） ",wPath);
if(write2File(nums,wPath)==-1) return 1;
printf("寫入成功! ");
return 0;
}
void showNums(int *nums)
{
int i;
if(nums) for(i=0,printf("文件內容： ");i<maxLen;printf("%d ",nums[i]),i++);
printf(" ");
}
int px(int *nums,int flag)
{
int i,j,n,temp;
if(!nums) return -1;
for(i=0;i<maxLen-1;i++)
{
n=i;
for(j=i+1;j<maxLen;j++)
{
if(flag && nums[n]>nums[j]) n=j;
if(!flag && nums[n]<nums[j]) n=j;
}
temp=nums[i],nums[i]=nums[n],nums[n]=temp;
}
return 1;
}
int write2File(int *nums,char path[])
{
int i;
FILE *fp=NULL;
if(!nums) return -1;
if(!(fp=fopen(path,"w"))) return -1;
//fseek(fp,SEEK_END);
for(i=0;i<maxLen;i++)
fprintf(fp,"%d ",nums[i]);
fclose(fp);
return 1;
}
int *read2Nums(char path[])
{
int *nums=NULL,*temp=NULL,cnt=0;
FILE *fp=NULL;
maxLen=10;
if(!(fp=fopen(path,"r"))) return NULL;
nums=(int *)malloc(sizeof(int)*maxLen);
if(!nums) return NULL;
while(fscanf(fp,"%d",&nums[cnt++])!=-1)
if(cnt==maxLen)//數組長度不夠擴展（每次擴展10長度）
{
maxLen=maxLen+10;
temp=(int *)realloc(nums,sizeof(int)*maxLen);
if(temp) return NULL;
nums=temp;
}
if(--cnt<maxLen)//函數結束前，刪除多餘地址，減少內存佔用
{
maxLen=cnt;
temp=(int *)realloc(nums,sizeof(int)*maxLen);
if(!temp) return NULL;
nums=temp;
}
fclose(fp);
return nums;
}
3. c語言程序編程
#include<stdio.h>
int main()
{
int a,b,c,d,f;
char e;
a=b=c=f=0;
printf("請輸入一行字元: \n");
while((e=getchar())!='\n')
{
if(('A'<=e&&e<='Z')||('a'<=e&&e<='z'))
a++;
else if ('0'<=e&&e<='9')
b++;
else if (e==' ')
c++;
else
f++;
}
printf("字母個數%d,數字個數%d,空格個數%d,其餘符號個數%d\n",a,b,c,f);
return 0;
}
4. C語言程序編寫！
#include<stdio.h> /*引用庫函數*/
#include<stdlib.h>
#include<ctype.h>
#include<string.h>
typedef struct /*定義結構體數組*/
{
char num[10]; /*學號*/
char name[20]; /*姓名*/
int score; /*成績*/
}Student;
Student stu[80]; /*結構體數組變數*/
int menu_select() /*菜單函數*/
{
char c;
do{
system("cls"); /*運行前清屏*/
printf("\t\t****Students' Grade Management System****\n"); /*菜單選擇*/
printf("\t\t | 1. Input Records |\n");
printf("\t\t | 2. Display All Records |\n");
printf("\t\t | 3. Sort |\n");
printf("\t\t | 4. Insert a Record |\n");
printf("\t\t | 5. Delete a Record |\n");
printf("\t\t | 6. Query |\n");
printf("\t\t | 7. Statistic |\n");
printf("\t\t | 8. Add Records from a Text File|\n");
printf("\t\t | 9. Write to a Text file |\n");
printf("\t\t | 0. Quit |\n");
printf("\t\t*****************************************\n");
printf("\t\t\tGive your Choice(0-9):");
c=getchar(); /*讀入選擇*/
}while(c<'0'||c>'9');
return(c-'0'); /*返回選擇*/
}
int Input(Student stud[],int n) /*輸入若干條記錄*/
{int i=0;
char sign,x[10]; /*x[10]為清除多餘的數據所用*/
while(sign!='n'&&sign!='N') /*判斷*/
{ printf("\t\t\tstudent's num:"); /*交互輸入*/
scanf("\t\t\t%s",stud[n+i].num);
printf("\t\t\tstudent's name:");
scanf("\t\t\t%s",stud[n+i].name);
printf("\t\t\tstudent's score:");
scanf("\t\t\t%d",&stud[n+i].score);
gets(x); /*清除多餘的輸入*/
printf("\t\t\tany more records?(Y/N)");
scanf("\t\t\t%c",&sign); /*輸入判斷*/
i++;
}
return(n+i);
}
void Display(Student stud[],int n) /*顯示所有記錄*/
{
int i;
printf("\t\t\t-----------------------------------\n"); /*格式頭*/
printf("\t\t\tnumber name score\n");
printf("\t\t\t-----------------------------------\n");
for(i=1;i<n+1;i++) /*循環輸入*/
{
printf("\t\t\t%-16s%-15s%d\n",stud[i-1].num,stud[i-1].name,stud[i-1].score);
if(i>1&&i%10==0) /*每十個暫停*/
{printf("\t\t\t-----------------------------------\n"); /*格式*/
printf("\t\t\t");
system("pause");
printf("\t\t\t-----------------------------------\n");
}
}
printf("\t\t\t");
system("pause");
}
void Sort_by_num(Student stud[],int n) /*按學號排序*/
{ int i,j,*p,*q,s;
char t[10];
for(i=0;i<n-1;i++) /*冒泡法排序*/
for(j=0;j<n-1-i;j++)
if(strcmp(stud[j].num,stud[j+1].num)>0)
{strcpy(t,stud[j+1].num);
strcpy(stud[j+1].num,stud[j].num);
strcpy(stud[j].num,t);
strcpy(t,stud[j+1].name);
strcpy(stud[j+1].name,stud[j].name);
strcpy(stud[j].name,t);
p=&stud[j+1].score;
q=&stud[j].score;
s=*p;
*p=*q;
*q=s;
}
}
int Insert_a_record(Student stud[],int n) /*插入一條記錄*/
{char x[10]; /*清除多餘輸入所用*/
printf("\t\t\tstudent's num:"); /*互動式輸入*/
scanf("\t\t\t%s",stud[n].num);
printf("\t\t\tstudent's name:");
scanf("\t\t\t%s",stud[n].name);
printf("\t\t\tstudent's score:");
scanf("\t\t\t%d",&stud[n].score);
gets(x);
n++;
Sort_by_num(stud,n); /*調用排序函數*/
printf("\t\t\tInsert Successed!\n"); /*返回成功信息*/
return(n);
}
int Delete_a_record(Student stud[],int n) /*按姓名查找，刪除一條記錄*/
{ char s[20];
int i=0,j;
printf("\t\t\ttell me his(her) name:"); /*互動式問尋*/
scanf("%s",s);
while(strcmp(stud[i].name,s)!=0&&i<n) i++; /*查找判斷*/
if(i==n)
{ printf("\t\t\tnot find!\n"); /*返回失敗信息*/
return(n);
}
for(j=i;j<n-1;j++) /*刪除操作*/
{
strcpy(stud[j].num,stud[j+1].num);
strcpy(stud[j].name,stud[j+1].name);
stud[j].score=stud[j+1].score;
}
printf("\t\t\tDelete Successed!\n"); /*返回成功信息*/
return(n-1);
}
void Query_a_record(Student stud[],int n) /*查找並顯示一個記錄*/
{ char s[20];
int i=0;
printf("\t\t\tinput his(her) name:"); /*互動式輸入*/
scanf("\t\t\t%s",s);
while(strcmp(stud[i].name,s)!=0&&i<n) i++; /*查找判斷*/
if(i==n)
{ printf("\t\t\tnot find!\n"); /*輸入失敗信息*/
return;
}
printf("\t\t\this(her) number:%s\n",stud[i].num); /*輸出該學生信息*/
printf("\t\t\this(her) score:%d\n",stud[i].score);
}
void Statistic(Student stud[],int n) /*新增功能，輸出統計信息*/
{ int i,j=0,k=0,sum=0;
float aver; /*成績平均值*/
for(i=0;i<n;i++) /*循環輸入判斷*/
{
sum+=stud[i].score;
if(stud[j].score>stud[i].score) j=i;
if(stud[k].score<stud[i].score) k=i;
}
aver=1.0*sum/n;
printf("\t\t\tthere are %d records.\n",n); /*總共記錄數*/
printf("\t\t\tthe hignest score:\n"); /*最高分*/
printf("\t\t\tnumber:%s name:%s score:%d\n",stud[j].num,stud[j].name,stud[j].score);
printf("\t\t\tthe lowest score:\n"); /*最低分*/
printf("\t\t\tnumber:%s name:%s score:%d\n",stud[k].num,stud[k].name,stud[k].score);
printf("\t\t\tthe average score is %5.2f\n",aver); /*平均分*/
}
int AddfromText(Student stud[],int n) /*從文件中讀入數據*/
{ int i=0,num;
FILE *fp; /*定義文件指針*/
char filename[20]; /*定義文件名*/
printf("\t\t\tInput the filename:");
scanf("\t\t\t%s",filename); /*輸入文件名*/
if((fp=fopen(filename,"rb"))==NULL) /*打開文件*/
{ printf("\t\t\tcann't open the file\n"); /*打開失敗信息*/
printf("\t\t\t");
system("pause");
return(n);
}
fscanf(fp,"%d",&num); /*讀入總記錄量*/
while(i<num) /*循環讀入數據*/
{
fscanf(fp,"%s%s%d",stud[n+i].num,stud[n+i].name,&stud[n+i].score);
i++;
}
n+=num;
fclose(fp); /*關閉文件*/
printf("\t\t\tSuccessed!\n");
printf("\t\t\t");
system("pause");
return(n);
}
void WritetoText(Student stud[],int n) /*將所有記錄寫入文件*/
{
int i=0;
FILE *fp; /*定義文件指針*/
char filename[20]; /*定義文件名*/
printf("\t\t\tWrite Records to a Text File\n"); /*輸入文件名*/
printf("\t\t\tInput the filename:");
scanf("\t\t\t%s",filename);
if((fp=fopen(filename,"w"))==NULL) /*打開文件*/
{
printf("\t\t\tcann't open the file\n");
system("pause");
return;
}
fprintf(fp,"%d\n",n); /*循環寫入數據*/
while(i<n)
{
fprintf(fp,"%-16s%-15s%d\n",stud[i].num,stud[i].name,stud[i].score);
i++;
}
fclose(fp); /*關閉文件*/
printf("Successed!\n"); /*返回成功信息*/
}
void main() /*主函數*/
{
int n=0;
for(;;)
{
switch(menu_select()) /*選擇判斷*/
{
case 1:
printf("\t\t\tInput Records\n"); /*輸入若干條記錄*/
n=Input(stu,n);
break;
case 2:
printf("\t\t\tDisplay All Records\n"); /*顯示所有記錄*/
Display(stu,n);
break;
case 3:
printf("\t\t\tSort\n");
Sort_by_num(stu,n); /*按學號排序*/
printf("\t\t\tSort Suceessed!\n");
printf("\t\t\t");
system("pause");
break;
case 4:
printf("\t\t\tInsert a Record\n");
n=Insert_a_record(stu,n); /*插入一條記錄*/
printf("\t\t\t");
system("pause");
break;
case 5:
printf("\t\t\tDelete a Record\n");
n=Delete_a_record(stu,n); /*按姓名查找，刪除一條記錄*/
printf("\t\t\t");
system("pause");
break;
case 6:
printf("\t\t\tQuery\n");
Query_a_record(stu,n); /*查找並顯示一個記錄*/
printf("\t\t\t");
system("pause");
break;
case 7:
printf("\t\t\tStatistic\n");
Statistic(stu,n); /*新增功能，輸出統計信息*/
printf("\t\t\t");
system("pause");
break;
case 8:
printf("\t\t\tAdd Records from a Text File\n");
n=AddfromText(stu,n); /*新增功能，輸出統計信息*/
break;
case 9:
printf("\t\t\tWrite to a Text file\n");
WritetoText(stu,n); /*循環寫入數據*/
printf("\t\t\t");
system("pause");
break;
case 0:
printf("\t\t\tHave a Good Luck,Bye-bye!\n"); /*結束程序*/
printf("\t\t\t");
system("pause");
exit(0);
}
}
}
5. c語言程序
准備材料
windows電腦、VC++（DEV_C++）
1.打開桌面上的DEV_C++,進入如下界面：
6. c程序語言
#include <stdio.h>
int prodct(int a ,int b );加上這句
main()
{
int x,y,p;
int prodct(int a ,int b);
scanf("%d,%d",&x,&y);
p=prodct(x,y);
printf("The proct is :%d",p);
}
int prodct(int a ,int b )
{
int c;
c=a*b;
return c ;
}
這里因為你沒有函數聲明，你不先聲明MAIN函數不知道你的prodct是啥東東。
7. C語言程序 （急）
#include "stdio.h"
void main()
{
int day,month,year,sum,leap;
printf("\nplease input year,month,day\n");
scanf("%d,%d,%d",&year,&month,&day);
switch(month)/*先計算某月以前月份的總天數*/
{
case 1:sum=0;break;
case 2:sum=31;break;
case 3:sum=59;break;
case 4:sum=90;break;
case 5:sum=120;break;
case 6:sum=151;break;
case 7:sum=181;break;
case 8:sum=212;break;
case 9:sum=243;break;