1月29日 io线程进程

题目：用fgets和fputs计算文件的字符数和行数

#include<stdio.h>

#include<unistd.h>

#include<string.h>

#define ERR_MSG(msg) do{\

printf("line:%d\n",__LINE__);\

perror(msg);\

}while(0)

int count(const char *s)

{

int counter=0;

chararr[32]="";

FILE*fp=fopen(s,"r");

if(NULL==fp){

ERR_MSG("fopen");

return-1;

}

while((fgets(arr,sizeof(arr),fp))!=NULL){

counter+=strlen(arr);

memset(arr,0,sizeof(arr));

}

if(fclose(fp)<0){

ERR_MSG("fclose");

return-1;

}

returncounter;

}

int main(int argc, const char *argv[])

{

intnum=0;

if(argc!=2){

printf("命令不正确，需要传参");

return-1;

}

num=count(argv[1]);

printf("文件大小为%d个字节",num);

return0;

}

#include<stdio.h>

#include<string.h>

#define ERR_MSG(msg) do{\

printf("line:%d\n",__LINE__);\

perror(msg);\

}while(0)

int count(const char *s)

{

int counter=0;

chararr[32]="";

FILE*fp=fopen(s,"r");

if(NULL==fp){

ERR_MSG("fopen");

return-1;

}

while((fgets(arr,sizeof(arr),fp))!=NULL){

if(arr[strlen(arr)-1]=='\n'){

counter++;

}

memset(arr,0,sizeof(arr));

}

if(fclose(fp)<0){

ERR_MSG("fclose");

return-1;

}

returncounter;

}

int main(int argc, const char *argv[])

{

intnum=0;

if(argc!=2){

printf("命令不正确，需要传参");

return-1;

}

num=count(argv[1]);

printf("文件有%d行",num);

return0;

}