问下文件输出输入这章节怎么学？
#include<stdio.h>
#include<stdlib.h>
int main(int argc,char *argv[])
{
int ch;
FILE * fp;
long count=0;
if(argc!=2)
{
printf("Usage:%s filename\n",argv[0]);
exit(1);
}
if((fp=fopen(argv[1],"r"))==NULL)
{
printf("Can't open %s\n",argv[1]);
exit(1);
}
while((ch=getc(fp))!=EOF)
{
putc(ch,stdout);
count++;
}
fclose(fp);
printf("File %s has %ld characters.\n",argv[1],count);
return 0;
}
[a]$ cat x.c
# include <stdio.h>
int main(int argc, char * argv[])
{
int i;
for (i = 0; i < argc; i++)
printf("%s\n", argv[i]);
return 0;
}
[a]$ ./x
./x
[a]$ ./x a b c
./x
a
b
c
[a]$ ./x a "b c"
./x
a
b c
