Job 7.27 IO process

1. use fgetc and fputc Realization , Copy a file , For example 1.c Copy your content to 2.c

Code

#include <stdio.h>
int main(int argc, const char *argv[])
{
    
	FILE *fp=fopen(argv[1],"r");
	if(NULL==fp)
	{
    
		perror("fopen");
		return -1;
	}
	FILE *fp2=fopen(argv[2],"w");
	if(NULL==fp2)
	{
    
		perror("fopen");
		return -1;
	}
	char a;
	while((a=fgetc(fp))!=-1)
	{
    
		fputc(a,fp2);
	}
	fclose(fp);
	fclose(fp2);

	return 0;
}

Running results

take helloworld.c Copy your content to test.c

2. use fgetc Calculate the size of a file , Require encapsulation into functions

function code

int size(const char *str)
{
    
	FILE *fp=fopen(str,"r");
	if(NULL==fp)
	{
    
		perror("fopen");
		return -1;
	}
	int count=0;
	while(fgetc(fp)!=-1)
	{
    
		count++;
	}
	fclose(fp);
	return count;
}

3. use fgetc Calculate how many lines a file has , Require encapsulation into functions （linux Operating system to \n ending , Even the last line has one ’\n’）

function code

int line(const char *str)
{
    
	FILE *fp=fopen(str,"r");	
	if(NULL==fp)
	{
    
		perror("fopen");
		return -1;
	}
	int count=0;
	char a;
	while((a=fgetc(fp))!=-1)
	{
    
		if(a=='\n')
		{
    
			count++;
		}
	}
	fclose(fp);
	return count;
}

Main function code

int main(int argc, const char *argv[])
{
    
	int a=size(argv[1]);
	int b=line(argv[1]);
	printf(" file size ：%d\n File lines ：%d\n",a,b);
	return 0;
}

Running results

Calculation helloworld.c File size and number of lines

4. use fgets and fputs Realization , Copy a file , For example 1.c Copy your content to 2.c

Code

#include <stdio.h>
int main(int argc, const char *argv[])
{
    
    FILE *fp=fopen(argv[1],"r");
    if(NULL==fp)
    {
    
        perror("fopen");
        return -1;
    }
    FILE *fp2=fopen(argv[2],"w");
    if(NULL==fp2)
    {
    
        perror("fopen");
        return -1;
    }
    char  a[100];                                                                     
    while(fgets(a,sizeof(a),fp)!=NULL)
    {
    
        fputs(a,fp2);
    }
	fclose(fp);
    fclose(fp2);
    return 0;
}

Running results

take helloworld.c Copy your content to test.c

5. use fgets Calculate the size of a file , Require encapsulation into functions

function code

int size(const char *str)
{
    
    FILE *fp=fopen(str,"r");
    if(NULL==fp)
    {
     
        perror("fopen"); 
        return -1; 
    }   
    int count=0;
	char a[100];
    while(fgets(a,sizeof(a),fp)!=NULL) 
    {
       
        count+=strlen(a); 
    }   
    fclose(fp); 
    return count; 
} 

6. use fgets Calculate how many lines a file has , Require encapsulation into functions （linux Operating system to \n ending , Even the last line has one ’\n’）

function code

int line(const char *str)
{
    
    FILE *fp=fopen(str,"r");    
    if(NULL==fp)
    {
    
        perror("fopen");
      return -1;
    }
    int count=0;
    char a[100];
    while((fgets(a,sizeof(a),fp))!=NULL)                                                    
    {
    
		if(a[strlen(a)-1]=='\n')
		{
    
            count++;
		}
    }
    fclose(fp);
    return count;
}

Main function code

int main(int argc, const char *argv[])
{
    
    int a=size(argv[1]);
    int b=line(argv[1]);
    printf(" file size ：%d\n File lines ：%d\n",a,b);
    return 0;
}

Running results

Calculation helloworld.c File size and number of lines