功能 | fp

int main（int argc，char * argv []） { if（argc！= 3） { put（使用错误）; 退出（EXIT_FAILURE）; } char a =''0''; int b，num; FILE * fp; num = atoi （argv [2]）; fp = fopen（argv [1]，" wb"）; 我想我需要一个for循环涉及到某处。我是不知道放在身上的是什么。比尔 I am trying to write a utility that takes as argument 1 a file name towrite to and as argument 2 takes num as a number of zeros to write aargument 1. A file of zeros. This is how far I have got. Why would I want afile of zeros? To mount to a loopback device. #include <stdio.h>#include <stdlib.h> intmain (int argc, char *argv[]){if (argc != 3){puts ("usage error");exit (EXIT_FAILURE);}char a = ''0'';int b, num;FILE *fp;num = atoi (argv[2]);fp = fopen (argv[1], "wb"); I am thinking that I would need a for loop involved here somewhere. I amnot sure what to put in the body. Bill推荐答案 Bill Cunningham写道： Bill Cunningham wrote: 我正在尝试编写一个实用程序，将一个文件作为参数1 写入的名称和因为参数2将num作为零的数量来表示写一个参数1.一个零的文件。这是我有多远。为什么我想要一个零文件？安装到环回设备。 I am trying to write a utility that takes as argument 1 a filename to write to and as argument 2 takes num as a number of zeros towrite a argument 1. A file of zeros. This is how far I have got. Whywould I want a file of zeros? To mount to a loopback device. [OT] dd if = / dev / zero of =< your filecount =< your size> [/ OT] [OT]dd if=/dev/zero of=<your filecount=<your size>[/OT] #include< stdio.h> #include< stdlib.h> int main（int argc，char * argv []） { if（argc ！= 3） { put（使用错误）; 退出（EXIT_FAILURE）; } char a =''0''; #include <stdio.h>#include <stdlib.h>intmain (int argc, char *argv[]){ if (argc != 3) { puts ("usage error"); exit (EXIT_FAILURE); } char a = ''0''; char a =''\ 0''; char a = ''\0''; int b，num; FILE * fp; num = atoi（argv [2]）; fp = fopen（argv [1]，" wb"） ; 我在想这里需要一个for循环。我不知道该放入体内。 int b, num; FILE *fp; num = atoi (argv[2]); fp = fopen (argv[1], "wb"); I am thinking that I would need a for loop involved heresomewhere. I am not sure what to put in the body. while（num--） fputc（a，fp）; fclose（fp）; 返回0; } 仍然需要一些错误检查（num> = 0，fp！= NULL，fclose和fput工作） while (num--)fputc(a, fp);fclose(fp);return 0;} Still needs some error checking (num>=0, fp != NULL, fclose and fput worked) Bill Bill 再见，Jojo Bye, Jojo " Joachim Schmitz" < no ********* @ schmitz-digital.dewrote in message news：g1 ********** @ online.de ... "Joachim Schmitz" <no*********@schmitz-digital.dewrote in messagenews:g1**********@online.de... [OT] dd if = / dev / zero of =< your filecount =< your size> [/ OT] [OT]dd if=/dev/zero of=<your filecount=<your size>[/OT] 啊。简单的方法:) Ah. The easy way out :) > #include< stdio.h> #include< stdlib。 h> 主要（int argc，char * argv []） { if（argc！= 3） { puts（使用错误）; 退出（EXIT_FAILURE）; } char a =''0''; >#include <stdio.h>#include <stdlib.h>intmain (int argc, char *argv[]){ if (argc != 3) { puts ("usage error"); exit (EXIT_FAILURE); } char a = ''0''; char a =''\'''; char a = ''\0''; 为什么终止字符串字符？你的意思是更换我的线路吗？你要加一个吗？ Why the termination string character? Do you mean to replace my line orare you adding one? > int b，num; FILE * fp; num = atoi（argv [2]）; fp = fopen（argv [1]，" wb"）; 我在想，我需要在这里涉及到一个for循环。我不知道该放入体内。 > int b, num; FILE *fp; num = atoi (argv[2]); fp = fopen (argv[1], "wb"); I am thinking that I would need a for loop involved heresomewhere. I am not sure what to put in the body. while（num--） fputc（a，fp）; fclose（fp）; 返回0; } 仍然需要一些错误检查（num> = 0，fp！= NULL，fclose和fput 工作） while (num--) fputc(a, fp);fclose(fp);return 0;}Still needs some error checking (num>=0, fp != NULL, fclose and fputworked) 我可以得到那个部分。我想。 I can get that part. I think. > Bill >Bill 再见，Jojo Bye, Jojo " Joachim Schmitz" < no ********* @ schmitz-digital.dewrote in message news：g1 ********** @ online.de ... [snip] "Joachim Schmitz" <no*********@schmitz-digital.dewrote in messagenews:g1**********@online.de... [snip] while（num--）fputc（a，fp）; fclose（fp）; 返回0; } 仍需要一些错误检查（num> = 0，fp！ = NULL，fclose和fput 工作） while (num--) fputc(a, fp);fclose(fp);return 0;}Still needs some error checking (num>=0, fp != NULL, fclose and fputworked) > Bill >Bill 再见，Jojo Bye, Jojo 虽然（num--）这是什么？这和我在这里想的一样。 int c; for（c = 1; c< num; c ++） Bill While(num--) What''s that? Is that the same as what I was thinking here. int c;for(c=1;c<num;c++) Bill 这篇关于功能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！