1月28日 io线程和进程

统计文件的字符数和行数

#include<stdio.h>

#define ERR_MSG(msg) do{\

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

perror(msg);\

}while(0)

int count(const char *s)

{

int counter;

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

if(NULL==fp){

ERR_MSG("fopen");

return-1;

}

while(fgetc(fp)!=EOF){

counter++;

}

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>

#define ERR_MSG(msg) do{\

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

perror(msg);\

}while(0)

int count(const char *s)

{

intc=0;

int counter=0;

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

if(NULL==fp){

ERR_MSG("fopen");

return-1;

}

while((c=fgetc(fp))!=EOF){

if(c=='\n'){

counter++;

}

}

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;

}