c primer plus 8编程练习

Posted 2021-08-29 小虾米2018

 

1、

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    int ch;
    FILE * fp;
    char filename[128];
    int sum = 0;
    
    printf("please input filename: ");
    scanf("%s", filename);
    
    fp = fopen(filename, "r");
    
    if(fp == NULL)
    {
        printf("file failed opened!\\n");
        exit(1);
    }
    
    while((ch = getc(fp)) != EOF)
    {
        putchar(ch);
        sum++;
    }
    
    printf("\\nsum: %d.\\n", sum);
    
    return 0;
}

 

#include <stdio.h>

int main(void)
{
    char ch;
    int sum = 0;
    
    while((ch = getchar()) != EOF)
    {
        putchar(ch);
        sum++;
    }
    
    printf("sum: %d.\\n", sum);
    
    return 0;
}

 

#include <stdio.h>

int main(void)
{
    char ch;
    int sum = 0;
    
    while((ch = getchar()) != EOF)
    {
        putchar(ch);
        if(ch > \'\\040\')
            sum++;
    }
    
    printf("sum: %d.\\n", sum);
    
    return 0;
}

 

#include <stdio.h>

int main(void)
{
    char ch;
    int sum = 0;
    
    while((ch = getchar()) != EOF)
    {
        putchar(ch);
        if(ch == \'\\n\')
            sum++;
    }
    
    printf("sum: %d.\\n", sum);
    
    return 0;
}