K& R2，练习7.6

* *写一个程序来比较2个文件，打印第一行 *它们不同的地方。 * * / #include< stdio.h> #include< stdlib.h> ＃ include< string.h> enum MAXSIZE {ARRSIZE = 1000}; void compare_files（FILE *，FILE *）; void print_line（char *）; int main（int argc，char * argv []） { FILE * pf1，* pf2; if（argc！= 3） { fprintf（stderr，"你iDiOT，我希望2个文件作为输入。\ n"）; 退出（EXIT_FAILURE）; } / *打开文件* / pf1 = fo笔（* ++ argv，" r" ）; pf2 = fopen（* ++ argv，" r"）; / *错误检查* / if（pf1 == NULL || pf2 == NULL） { fprintf（stderr，错误打开文件\ n）; 退出（EXIT_FAILURE）; } 其他 { compare_files（pf1，pf2） ; } / *别忘了关闭文件* / fclose（pf1）; fclose（pf2）; 返回0; } / *比较2个文件* / void compare_files（FILE * pf1，FILE * pf2） { int c1，c2，match; char * line1，* line2; char * begin_line1，* begin_line2; match = 1; while（（（line1 = fgets（line1，ARRSIZE，pf1））！= NULL）|| （（line2 = fgets（line2，ARRSIZE，pf2））！= NULL）） { begin_line1 = line1; begin_line2 = line2; for（c1 = * line1， c2 = * line2; c1！=' '\ 0''&& c2！=''\'''; ++ line1， ++ line2） { if（c1！= c2） { match = 0; print_line（begin_line1）; printf（" \\\ ----------- ------------ \\\"）; print_line（begin_line2）; } } } } void print_line（char * line） { printf（"％s \ n"，* line ++）; } ==================输出================== ==== [arnuld @ raj C] $ gcc -ansi -pedantic -Wall -Wextra 7-6.c 7-6.c：in function` print_line''： 7-6.c：88：警告：格式参数不是指针（arg 2） [arnuld @ raj C] $ ./a.out 你iDiOT，我希望2个文件作为输入。 [arnuld @ raj C] $ ./a.out 7- 6.c 5-4.c 分段错误 - http://lispmachine.wordpress.com/ 我的电子邮件ID在上面的地址PURPOSE :: see statement in commentsGOT: Segmentation FaultI guess the segfault is sourced in the compile-time warning but I amgiving a char* to the function already./* K&R2, section 7.7, exercise 7.6** write a program to compare 2 files, printing that first line* where they differ.**/#include <stdio.h>#include <stdlib.h>#include <string.h>enum MAXSIZE { ARRSIZE=1000 };void compare_files( FILE*, FILE* );void print_line( char* );int main( int argc, char* argv[] ){FILE *pf1, *pf2;if( argc !=3 ){fprintf( stderr, "You iDiOT, I expect 2 files as input. \n" );exit(EXIT_FAILURE);}/* open files */pf1 = fopen( *++argv, "r" );pf2 = fopen( *++argv, "r" );/* error check */if( pf1 == NULL || pf2 == NULL ){fprintf( stderr, "error opening files\n");exit(EXIT_FAILURE);}else{compare_files( pf1,pf2 );}/* don''t forget to close the files */fclose( pf1 );fclose( pf2 );return 0;}/* compare 2 files */void compare_files( FILE* pf1, FILE* pf2 ){int c1, c2, match;char *line1, *line2;char *begin_line1, *begin_line2;match = 1;while( ((line1 = fgets( line1, ARRSIZE, pf1 )) != NULL) ||((line2 = fgets( line2, ARRSIZE, pf2 )) != NULL)){begin_line1 = line1;begin_line2 = line2;for( c1 = *line1, c2 = *line2; c1 != ''\0'' && c2 != ''\0''; ++line1,++line2 ){if ( c1 != c2 ){match = 0;print_line( begin_line1 );printf("\n-----------------------\n"); print_line( begin_line2 );}}}}void print_line( char* line ){printf("%s\n", *line++);}================== OUTPUT ======================[arnuld@raj C]$ gcc -ansi -pedantic -Wall -Wextra 7-6.c7-6.c: In function `print_line'':7-6.c:88: warning: format argument is not a pointer (arg 2)[arnuld@raj C]$ ./a.outYou iDiOT, I expect 2 files as input.[arnuld@raj C]$ ./a.out 7-6.c 5-4.cSegmentation fault-- http://lispmachine.wordpress.com/my email ID is at the above address推荐答案 gcc -ansi -pedantic -Wall -Wextra 7-6.c 7-6.c：在函数`print_line''： 7-6.c：88：警告：表格在参数不是指针（arg 2） [arnuld @ raj C]gcc -ansi -pedantic -Wall -Wextra 7-6.c7-6.c: In function `print_line'':7-6.c:88: warning: format argument is not a pointer (arg 2)[arnuld@raj C] ./ a.out 你iDiOT，我希望2个文件作为输入。 [arnuld @ raj C]./a.outYou iDiOT, I expect 2 files as input.[arnuld@raj C] ./ a.out 7-6。 c 5-4.c 分段错误 - http://lispmachine.wordpress.com/ 我的电子邮件地址在上述地址./a.out 7-6.c 5-4.cSegmentation fault-- http://lispmachine.wordpress.com/my email ID is at the above address 这篇关于K&amp; R2，练习7.6的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！