题目修改下列程序用命令行界面代替交互式界面#include stdio.h#include stdlib.h#include string.h#define BUFSIZE 4096#define SLEN 81void append(FILE * source,FILE * dest);char * s_gets(char * st,int n);int main(){FILE * fa, * fs;int files 0;char file_app[SLEN];char file_src[SLEN];int ch;puts(Enter name of destination file: );s_gets(file_app,SLEN); //输入目标文件名if((fa fopen(file_app,a)) NULL){fprintf(stderr,cantt open %s\n,file_app);exit(EXIT_FAILURE);}if(setvbuf(fa,NULL,_IOFBF,BUFSIZE) ! 0){fputs(Cant create output buffer\n,stderr);exit(EXIT_FAILURE);}puts(Enter name of first source file (empty line to quit): );while(s_gets(file_src,SLEN) file_src[0] ! \0){if(strcmp(file_src,file_app) 0) fputs(Cant append file to itself\n,stderr);else if((fs fopen(file_src,r)) NULL) fprintf(stderr,Cant open %s\n,file_src);else{if(setvbuf(fs,NULL,_IOFBF,BUFSIZE) ! 0){fputs(Cants append file to itself\n,stderr);continue;}append(fs,fa);if(ferror(fs) ! 0) fprintf(stderr,Error in reading file %s.\n,file_src);if(ferror(fa) ! 0) fprintf(stderr,Error in writing file %s.\n,file_app);fclose(fs); //关闭读取文件继续下一次的读取files;printf(File %s appended.\n,file_src);puts(Next file (empty line to quit): );}}printf(Done appending. %d files appended.\n,files);rewind(fa);printf(%s contents:\n,file_app);while((ch getc(fa)) ! EOF) putchar(ch);puts(Done displaying.);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);}}char * s_gets(char * st,int n){char * ret_val;char * find;ret_val fgets(st,n,stdin);if(ret_val){find strchr(st,\n);if(find) *find \0;else{while(getchar() ! \n)continue;}}}源代码#include stdio.h #include stdlib.h #include string.h #define BUFSIZE 4096 #define SLEN 81 void append(FILE * source,FILE * dest); char * s_gets(char * st,int n); int main(int argc,char * argv[]){ FILE * fa, * fs; int files 0; int ch; if((fa fopen(argv[1],a)) NULL){ fprintf(stderr,cantt open %s\n,argv[1]); exit(EXIT_FAILURE); } if(setvbuf(fa,NULL,_IOFBF,BUFSIZE) ! 0){ fputs(Cant create output buffer\n,stderr); exit(EXIT_FAILURE); } for(int i 2;i argc-1;i){ if(strcmp(argv[i],argv[1]) 0) fputs(Cant append file to itself\n,stderr); else if((fs fopen(argv[i],r)) NULL) fprintf(stderr,Cant open %s\n,argv[i]); else{ if(setvbuf(fs,NULL,_IOFBF,BUFSIZE) ! 0){ fputs(Cants append file to itself\n,stderr); continue; } append(fs,fa); if(ferror(fs) ! 0) fprintf(stderr,Error in reading file %s.\n,argv[i]); if(ferror(fa) ! 0) fprintf(stderr,Error in writing file %s.\n,argv[1]); fclose(fs); //关闭读取文件继续下一次的读取 files; printf(File %s appended.\n,argv[i]); } } printf(Done appending. %d files appended.\n,files); rewind(fa); printf(%s contents:\n,argv[1]); while((ch getc(fa)) ! EOF) putchar(ch); puts(\nDone displaying.); 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); } } char * s_gets(char * st,int n){ char * ret_val; char * find; ret_val fgets(st,n,stdin); if(ret_val){ find strchr(st,\n); if(find) *find \0; else{ while(getchar() ! \n) continue; } } }演示效果如果朋友你感觉文章的内容对你有帮助可以点赞关注文章和专栏以及关注我哈嘿嘿嘿我会定期更新文章的谢谢朋友你的支持哈
