学c语言做练习之​统计文件中字符的个数

统计文件中字符的个数(采用命令行参数）

#include<stdio.h>
#include<stdlib.h>
int main(int argc, char *argv[])
{
 char ch;
 FILE *fp;
 long count=0;
 
 if(argc !=2)
 {
  printf("文件名是：%s\n",argv[0]);
  exit(EXIT_FAILURE);
 }
 if ((fp=fopen(argv[1],"r+"))==NULL)
 {
  fprintf(stderr,"不能打开文件\"%s\"\n",argv[1]);
  exit(EXIT_FAILURE);
 }
 while((ch=getc(fp)) !=EOF)
 {
  putc(ch,stdout);
  ++count;
 }
 fclose(fp);
 printf("File %s has %ld characters\n",argv[1],count);
 return 0;
}

统计文件中字符个数(不采用命令行参数)

#include<stdio.h>
#include<stdlib.h>
#define MAX 80
int main(void)
{
 FILE *fp;
 char ch;
 char name[MAX];
 long count=0;
 
 printf("请输入文件名：");
 gets(name);
 if ((fp=fopen(name,"r+"))==NULL)
 {
  fprintf(stderr,"不能打开文件%s\n",name);
  exit(EXIT_FAILURE);
 }
 while((ch=getc(fp))!=EOF)
 {
  putc(ch,stdout);
  count++;
 }
 fclose(fp);
 printf("File %s has %ld characters\n",name,count);
 return 0;
}