6月12日C代码

  1 //-------------------------------------------1
  2 #include<stdio.h>
  3 #include<stdlib.h>
  4 void main()
  5 {
  6     FILE *fp;
  7     int x;
  8     if((fp=fopen("f1.txt","w+"))==NULL)//打开（创建）文件为写入数据做准备
  9     {
 10         printf("Can't open this file!\n");
 11         exit(1);
 12     }
 13     printf("input x:");
 14     scanf("%d",&x);
 15     fprintf(fp,"%6d",x);//将变量x中的值写入文件
 16     fclose(fp);//关闭文件
 17 
 18     if((fp=fopen("f1.txt","r+"))==NULL)//再打开文件为写入数据做准备
 19     {
 20         printf("Can't open this file!\n");
 21         exit(2);
 22     }
 23     fscanf(fp,"%d",&x);//由文件读出整数给变量x;
 24     printf("%6d",x);
 25     printf("\n");
 26     fclose(fp);//再关闭文件
 27 }
 28 //---------------------------------------------------------2
 29 /*
 30 打开文件函数fopen().关闭文件函数fclose().
 31 字符读取函数fgetc和fputc
 32 字符串读取函数fgets和fputs
 33 格式化读取函数fscanf和fprintf
 34 数据块读取函数freed和fwrite
 35 检测文件结束函数feof(),eof()
 36 */
 37 #include<stdio.h>
 38 #include<stdlib.h>
 39 void main()
 40 {
 41     FILE *fp;//定义文件指针
 42     char ch,filename[10];//定义字符变量和字符数组，字符数组用来放文件名
 43     gets(filename);//接受来自键盘输入的文件名
 44     if((fp=fopen(filename,"w"))==NULL)//打开文件并判断是否成功
 45     {
 46         printf("can not open file\n");
 47         exit(1);//打开文件失败结束过程，exit()函数在stdlib.h中
 48     }
 49     printf("Please input string:");
 50     while ((ch=getchar())!='#')//循环接受字符，并判断是否是结束符
 51         fputc(ch,fp);//将字符写入文件
 52         fclose(fp);//关闭文件
 53 }
 54 //-------------------------------------------3
 55 #include"stdio.h"
 56 #include<stdlib.h>
 57 void main()
 58 {
 59     FILE *in,*out;
 60     char ch,infile[10],outfile[10];
 61     scanf("%s",infile);
 62     scanf("%s",outfile);
 63     if((in=fopen(infile,"r"))==NULL)
 64     {
 65         printf("can not open infile\n");
 66         exit(1);
 67     }
 68         if((out=fopen(outfile,"w"))==NULL)
 69         {
 70             printf("cannot open outfile\n");
 71             exit(1);
 72         }
 73         while((ch=fgetc(in))!=EOF)
 74             fputc(ch,out);
 75         fclose(in);
 76         fclose(out);
 77 }
 78 //-------------------------------------4
 79 #include<stdio.h>
 80 #include<string>
 81 void main()
 82 {
 83     FILE *fp;
 84     char string[81];//
 85     if((fp=fopen("file1.txt","w"))==NULL)
 86     {
 87         printf("can't open file");
 88         exit(1);
 89     }
 90     while(strlen(gets(string))>0)
 91     {
 92         fputs(string,fp);
 93         fputs("\n",fp);
 94     }
 95     fclose(fp);
 96     if((fp=fopen("file1.txt","r"))==NULL)
 97     {
 98         printf("can't open file");
 99         exit(1);
100     }
101     while(fgets(string,81,fp)!=NULL)//while（!feof(fp)）
102 
103         fputs(string,stdout);//将string指向的字符串输出到stdout(显示器)上
104     fclose(fp);
105 }
106 //--------------------------------------5
107 #include<stdio.h>
108 #include<string>
109 #define N 10
110 void main()
111 {
112     FILE *fp;
113     int i,x;
114     if((fp=fopen("f1.txt","w+"))==NULL)
115     {
116         printf("Can't open this file!\n");
117         exit(1);
118     }
119     for(i=0;i<N;i++)
120     {
121         scanf("%d,&x");
122         fprintf(fp,"%6d",x);
123     }
124     fclose(fp);
125     if((fp=fopen("f1.txt","r+"))==NULL)
126     {
127         printf("Can't open this file!\n");
128         exit(2);
129     }
130     for(i=0;i<N;i++)
131     {
132         fscanf(fp,"%d",&x);
133         printf("%6d",x);
134     }
135     printf("\n");
136     fclose(fp);
137 }
138 //-----------------------------------------------6
139 #include<stdio.h>
140 #include<string>
141 struct stu
142 {
143     int num;
144     char name[10];
145     int score[3];
146 }student;
147 void main()
148 {
149     int i;
150     FILE *fp;
151     if((fp=fopen("list1","ab"))==NULL)
152     {
153         printf("cannot open file\n");
154         exit(1);
155     }
156     printf("student information:\n");
157     printf("num:\n");
158     scanf("%d",&student.num);
159     printf("name:\n");
160     scanf("%s",&student.name);
161     printf("score1:\n");
162     scanf("%d",&student.score[0]);
163     printf("score2:\n");
164     scanf("%d",&student.score[1]);
165     printf("score3:\n");
166     scanf("%d",&student.score[2]);
167     if(fwrite(&student,sizeof(struct stu),1,fp)!=1)//写一个学生数据块文件
168         printf("file write error:\n");
169     fclose(fp);
170 }
171 //----------------------------------------------------7
172 #include<stdio.h>
173 #include<stdlib.h>
174 #define N 3
175 struct stu
176 {
177     int num;
178     char name[10];
179     int score[3];
180 }students[N];
181 void main()
182 {
183     FILE*fp;
184     int i;
185     if((fp=fopen("list ","rb"))==NULL)//以读方式打开二进制文件
186     {
187         printf("cannot open file!\n");
188         exit(1);
189     }
190     for(i=0;i<N;i++)
191     {
192         fseek(fp,i*sizeof(struct stu),0);//以起点为基准，按学生数据块移动位置指针
193         fread(&students[i],sizeof(struct stu),1,fp);//读出一个学生数据
194         printf("%d,%s, %d,%d\n",students[i].num,students[i].name),students[i].score[0],students[i].score[1],students[i].score[2];);
195     }
196     fclose(fp);
197 }
198 //-------------------------------------------8
199 #include"stdio.h"
200 main()
201 {
202     FILE *fp1,*fp2;
203     char c;
204     fp1=fopen("work1","r");
205     fp2=fopen("f2.txt","w");
206     while((c=getc(fp1))!=EOF)
207         putchar(c);//读出work1中的信息并写到屏幕上
208     rewind(fp1);//把文件的内部指针移到文件的开始处
209     while((c=fgetc(fp1))!=EOF)//读出work1中的信息并写入到f2中
210         fputc(c,fp2);
211     fclose(fp1);
212     fclose(fp2);
213 }
214 //-----------------------------------9
215 #include<stdio.h>
216 #include<stdlib.h>
217 #define N 3
218 struct stu
219 {
220     int num;
221     char name[10];
222     int score[3];
223 }student[N];
224 void main()
225 {
226     FILE*fp;
227     int i;
228     for(i=0;i<N;i++)
229     {
230         printf("%d student information:\n");
231         printf("num:\n");
232         scanf("%d",&students[i].num);
233         printf("name:\n");
234         scanf("%s",students[i].name);
235         printf("score1:\n");
236         scanf("%d",students[i].score[0]);
237         printf("score2:\n");
238         scanf("%d",students[i].score[1]);
239         printf("score3:\n");
240         scanf("%d",students[i].score[2]);
241     }
242     if(fwrite(&students,sizeof(struct stu),N,fp)!=N)
243         printf("file write error\n");
244     fclose(fp);
245     if((fp=fopen("list","rb"))==NULL)
246     {
247         printf("Can't open this file!\n");
248             exit(1);
249     }
250     if(fread(&students,sizeof(struct stu),N,fp)!=N)
251         printf("file write error\n");
252     for(i=0;i<N;i++)
253     {
254         printf("%d,%s, %d,%d,%d\n",students[i].num,students[i].name,students[i].score[0],students[i].score[1],students[i].score[2]);
255     }
256     fclose(fp);
257 }
258 //-------------------------------------------10
259 #include<stdio.h>
260 #include<stdlib.h>
261 #define N 3
262 struct stu
263 {
264     int num;
265     char name[10];
266     int score[3];
267 }students[N];
268 void main()
269 {
270     FILE*fp;
271     int i;
272     for(i=0;i<N;i++)
273     {
274         printf("%d student information:\n");
275         printf("num:\n");
276         scanf("%d",&students[i].num);
277         printf("name:\n");
278         scanf("%s",students[i].name);
279         printf("score1:\n");
280         scanf("%d",students[i].score[0]);
281         printf("score2:\n");
282         scanf("%d",students[i].score[1]);
283         printf("score3:\n");
284         scanf("%d",students[i].score[2]);
285     }
286     if((fp=fopen("data.txt","w+"))==NULL)
287     {
288         printf("Can't open this file!\n");
289         exit(1);
290     }
291     for(i=0;i<N;i++)
292     {
293         printf("%d,%s, %d,%d,%d\n",students[i].num,students[i].name,students[i].score[0],students[i].score[1],students[i].score[2]);
294     }
295     fclose(fp);
296 }
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