C Primer Plus（第五版）第13章文件输入/输出

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13.1 #include <stdio.h> #include <stdlib.h> int main(void) { int ch; FILE *fp; long count=0; char name[100]={0}; puts("input the filename that you whant to operate"); scanf("%s",name); if ((fp=fopen(name,"r"))==NULL) { printf("Can't open %s\n",name); exit(1); } while ((ch=getc(fp))!=EOF) { putc(ch,stdout); count++; } fclose(fp); printf("File %s has %ld characters\n",name,count); return 0; } 13.2 #include<stdio.h> #include<stdlib.h> #define bufsize 1024*1024 int main(int num,char **sname) { FILE*d,*s; int c; char buf[bufsize]; char dname[100]={0}; sprintf(dname,"%s_copy",sname[1]); if((d=fopen(dname,"wb"))==NULL) { fprintf(stderr,"can not to open %s\n",dname); exit(EXIT_FAILURE); } if((s=fopen(sname[1],"rb"))==NULL) { fprintf(stderr,"can not to open %s\n",sname[1]); exit(EXIT_FAILURE); } while((c=fread(buf,sizeof(char),bufsize,s))!=0) fwrite(buf,sizeof(char),c,d); if(ferror(s)||ferror(d)) { fprintf(stderr,"copy failure\n"); exit(EXIT_FAILURE); } if(fclose(s)||fclose(d)) { fprintf(stderr,"cannot close flie\n"); exit(EXIT_FAILURE); } return 0; } 13.3 #include<stdio.h> #include<stdlib.h> #include<ctype.h> #define bufsize 1024*1024 int main(void) { char s[100],d[100]; FILE*sp,*dp; int c; puts("input the source filename for copy"); scanf("%s",s); puts("input the destination filename"); scanf("%s",d); if((sp=fopen(s,"r"))==NULL) { fprintf(stderr,"can not open the %s file",s); exit(EXIT_FAILURE); } if((dp=fopen(d,"w"))==NULL) { fprintf(stderr,"can not open the %s file",d); exit(EXIT_FAILURE); } while((c=getc(sp))!=EOF) putc(toupper(c),dp); if(ferror(sp)||ferror(dp)) { fprintf(stderr,"copy failure\n"); exit(EXIT_FAILURE); } if(fclose(sp)||fclose(dp)) { fprintf(stderr,"cannot close flie\n"); exit(EXIT_FAILURE); } return 0; } 13.4 #include<stdio.h> #include<stdlib.h> #define bufsize 1024*1024 int main(int num,char**f) { int i,c; FILE*s; char buf[bufsize]={0}; for(i=1;i<num;i++) { if((s=fopen(f[i],"rb"))==NULL) { fprintf(stderr,"%s can not open.\n",f[i]); exit(EXIT_FAILURE); } while((c=fread(buf,sizeof(char),bufsize,s))!=0) fwrite(buf,sizeof(char),c,stdout); if(ferror(s)||ferror(stderr)) { fprintf(stderr,"a problem detectied\n"); exit(EXIT_FAILURE); } if(fclose(s)) { fprintf(stderr,"a problem detectied\n"); exit(EXIT_FAILURE); } } return 0; } 13.5 #include <stdio.h> #include <stdlib.h> #include <string.h> #define BUFSIZE 1024 void append(FILE *source, FILE *dest); int main(int num,char**p) { FILE *fa,*fs; int files=0; int i=1; if ((fa=fopen(p[1],"ab"))==NULL) { fprintf(stderr,"Can't open %s\n",p[1]); exit(2); } if (setvbuf(fa,NULL,_IOFBF,BUFSIZE)!=0) { fputs("Can't create output buffer\n",stderr); exit(3); } while (++i<num) { if (strcmp(p[1],p[i])==0) fputs("Can't append file to itself\n",stderr); else if ((fs=fopen(p[i],"rb"))==NULL) fprintf(stderr,"Can't open %s\n",p[i]); else { if (setvbuf(fs,NULL,_IOFBF,BUFSIZE)!=0) { fputs("Can't create input buffer\n",stderr); continue; } append(fs, fa); if (ferror(fs)!=0) fprintf(stderr,"Error in reading file %s.\n",p[i]); if (ferror(fa)!=0) fprintf(stderr,"Error in writing file %s.\n",p[1]); fclose(fs); files++; printf("File %s appended.\n",p[i]); } } printf("Done. %d files appended.\n", files); fclose(fa); return 0; } void append(FILE *source, FILE *dest) { size_t bytes; static char temp[BUFSIZE]; while ((bytes=fread(temp,sizeof(char),BUFSIZE,source))>0) fwrite(temp,sizeof(char),bytes,dest); } 13.6 #include <stdio.h> #include <stdlib.h> #include <string.h> #define LEN 40 int main(void) { FILE *in,*out; int ch,i; char c; char name[LEN]; char iname[LEN]; puts("type the input filename"); for(i=0;(c=getchar())!='\n'&&i<LEN-1;i++) iname[i]=c; iname[i]=0; int count=0; if ((in=fopen(iname,"r"))==NULL) { fprintf(stderr,"I couldn't open the file \"%s\"\n",iname); exit(2); } strncpy(name,iname,LEN-5); name[LEN-5]='\0'; strcat(name,".red"); if ((out=fopen(name,"w"))==NULL) { fprintf(stderr,"Can't create output file.\n"); exit(3); } while ((ch=getc(in))!=EOF) if (count++%3==0) putc(ch,out); if (fclose(in)!=0||fclose(out)!=0) fprintf(stderr,"Error in closing files\n"); return 0; } 13.7.a #include<stdio.h> #include<stdlib.h> #define len 81 int main(void) { FILE *f1,*f2; int c1,c2; char n1[len],n2[len]; puts("input the first filename"); while(fscanf(stdin,"%s",n1)==0) puts("wrong,do it again"); puts("input the second filename"); while(fscanf(stdin,"%s",n2)==0) puts("wrong,do it again"); if((f1=fopen(n1,"r"))==NULL) { fprintf(stderr,"can not open %s\n",n1); exit(EXIT_FAILURE); } if((f2=fopen(n2,"r"))==NULL) { fprintf(stderr,"can not open %s\n",n2); exit(EXIT_FAILURE); } c1=getc(f1); c2=getc(f2); while(c1!=EOF||c2!=EOF) { while(c1!=EOF&&c1!='\n') { putchar(c1); c1=getc(f1); } if(c1=='\n') putchar(c1); while(c2!=EOF&&c2!='\n') { putchar(c2); c2=getc(f2); } if(c2=='\n') putchar(c2); c1=getc(f1); c2=getc(f2); } if(fclose(f1)||fclose(f2)) { fprintf(stderr,"cannot close flie\n"); exit(EXIT_FAILURE); } return 0; } 13.7.b #include<stdio.h> #include<stdlib.h> #define len 81 int main(void) { FILE *f1,*f2; int c1,c2; char n1[len],n2[len]; puts("input the first filename"); while(fscanf(stdin,"%s",n1)==0) puts("wrong,do it again"); puts("input the second filename"); while(fscanf(stdin,"%s",n2)==0) puts("wrong,do it again"); if((f1=fopen(n1,"r"))==NULL) { fprintf(stderr,"can not open %s\n",n1); exit(EXIT_FAILURE); } if((f2=fopen(n2,"r"))==NULL) { fprintf(stderr,"can not open %s\n",n2); exit(EXIT_FAILURE); } c1=getc(f1); c2=getc(f2); while(c1!=EOF||c2!=EOF) { while(c1!=EOF&&c1!='\n') { putchar(c1); c1=getc(f1); } while(c2!=EOF&&c2!='\n') { putchar(c2); c2=getc(f2); } puts(""); c1=getc(f1); c2=getc(f2); } if(fclose(f1)||fclose(f2)) { fprintf(stderr,"cannot close flie\n"); exit(EXIT_FAILURE); } return 0; } 13.8 #include<stdio.h> #include<stdlib.h> int main(int num,char **p) { int c,i,k; i=0; FILE*f; if(num==1) { puts("at least one argument."); exit(EXIT_FAILURE); } else if(num==2) { while((c=getc(stdin))!=EOF) if(c==p[1][0]) i++; fprintf(stdout,"in stdin the %c appear %d times\n",p[1][0],i); } else for(k=0;k<num-2;k++) { i=0; if((f=fopen(p[k+2],"r"))==NULL) fprintf(stderr,"can not open the %s \n",p[k+2]); else { while((c=getc(f))!=EOF) if(c==p[1][0]) i++; fprintf(stdout,"in %s the %c appear %d times\n",p[k+2],p[1][0],i); if(fclose(f)!=0) fprintf(stderr,"Error closing file\n"); } } return 0; } 13.9 #include <stdio.h> #include <stdlib.h> #include<string.h> #define MAX 40 int main(void) { FILE*fp; char i=0; char words[MAX]; char temp[MAX+5]={0}; if ((fp=fopen("wordy","a+"))==NULL) { fprintf(stdout,"Can't open \"words\" file.\n"); exit(1); } puts("Enter words to add to the file; press the Enter"); puts("key at the beginning of a line to terminate."); while (fgets(words,MAX,stdin)!=NULL&&words[0]!='\n') { i++; sprintf(temp,"%d",i); strcat(temp,words); fprintf(fp,"%s",temp);} puts("File contents:"); rewind(fp); while (fscanf(fp,"%s",words)==1) puts(words); if (fclose(fp)!=0) fprintf(stderr,"Error closing file\n"); return 0; } 13.10 #include<stdio.h> #include<stdlib.h> #define size 81 int main(void) { char name[size]; FILE*f; char c; puts("input a filename for operate EOF to quit"); while(fscanf(stdin,"%s",name)==1) { while(getchar()!='\n') ; if((f=fopen(name,"r"))==NULL) { puts("can not open this file"); exit(EXIT_FAILURE); } while((c=getc(f))!='\n') putc(c,stdout); puts(""); if(fclose(f)!=0) { puts("can not close this file"); exit(EXIT_FAILURE); } puts("input a filename for operate EOF to quit"); } return 0; } 13.11 #include<stdio.h> #include<stdlib.h> #include<string.h> #define size 1024*1024 int main(int num,char**p) { FILE*f; char s[size]; if(num!=3) { fprintf(stderr,"wrong input,use %s argument1 argument2\n",p[0]); exit(EXIT_FAILURE); } if((f=fopen(p[2],"r"))==NULL) { fprintf(stderr,"can not open the %s",p[2]); exit(EXIT_FAILURE); } while(fgets(s,size,f)!=NULL) if(strstr(s,p[1])!=NULL) fputs(s,stdout); if(fclose(f)!=0) { fprintf(stderr,"can not close the %s",p[2]); exit(EXIT_FAILURE); } return 0; } 13.12 #include<stdio.h> #include<stdlib.h> #include<string.h> #define size 81 #define row 20 #define clu 31 char change(char); int main(void) { FILE*s,*d; int i,j; int *c,ch; char name[size]; int matrix[row][clu]={0}; puts("input the graphic filename"); fscanf(stdin,"%s",name); if((s=fopen(name,"r"))==NULL) { puts("cannot open the file"); exit(EXIT_FAILURE); } strcat(name,"_graphic"); if((d=fopen(name,"w"))==NULL) { fprintf(stderr,"cannot open the %s",name); exit(EXIT_FAILURE); } for(i=0;i<row;i++) for(j=0;j<clu;j++) { while((ch=getc(s))==' ') ; matrix[i][j]=ch; } c=(int*)matrix; for(i=0;i<row*clu;i++) putc(change(c[i]),d); if(fclose(s)||fclose(d)) { puts("cannot close the file"); exit(EXIT_FAILURE); } return 0; } char change(char c) { if(!isdigit(c)) return c; switch(c) { case '0': return ' '; case '1': return '.'; case '2': return '\''; case '3': return ':'; case '4': return '~'; case '5': return '*'; case '6': return '='; case '7': return c; case '8': return '%'; case '9': return '#'; } } 13.13 #include<stdio.h> #include<stdlib.h> #include<string.h> #define size 81 #define row 20 #define clu 30 char change(char); int main(void) { FILE*s,*d; int i,j; int ch; char name[size]; int matrix[row+2][clu+2]={0}; puts("input the graphic filename"); fscanf(stdin,"%s",name); if((s=fopen(name,"r"))==NULL) { puts("cannot open the file"); exit(EXIT_FAILURE); } strcat(name,"_graphic"); if((d=fopen(name,"w"))==NULL) { fprintf(stderr,"cannot open the %s",name); exit(EXIT_FAILURE); } for(i=1;i<row+1;i++) for(j=1;j<clu+1;j++) { ch=getc(s); while(ch==' '||ch=='\n') ch=getc(s); matrix[i][j]=ch; } _Bool up,down,left,right; int c; for(i=1;i<row+1;i++) for(j=1;j<clu+1;j++) { up=down=left=right=0; c=4; if(j-1>=1){if(matrix[i][j]-matrix[i][j-1]>1)left=1;} else{left=1;c--;} if(j+1<clu+1){if(matrix[i][j]-matrix[i][j+1]>1)right=1;} else{right=1;c--;} if(i-1>=1){if(matrix[i][j]-matrix[i-1][j]>1)up=1;} else{up=1;c--;} if(i+1<row+1){if(matrix[i][j]-matrix[i+1][j]>1)down=1;} else{down=1;c--;} if(left&&right&&up&&down) matrix[i][j]=(matrix[i-1][j]+matrix[i+1][j]+matrix[i][j-1]+matrix[i][j+1])/c; } for(i=1;i<row+1;i++) { for(j=1;j<clu+1;j++) putc(matrix[i][j],d); putc('\n',d); } if(fclose(s)||fclose(d)) { puts("cannot close the file"); exit(EXIT_FAILURE); } return 0; }

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