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c - ingore C语言从文本文件中读取数据时回车（换行）

问题描述

我正在从文件“test1.txt”中读取一些数据，一切正常，但是当遇到 Enter（换行符）时，它给了我不想要的答案

代码和文件：

主.c：

#include "fscan.h"
#include <stdio.h>
 
int main(){
    float lstm_val;
    int row;
    int col;
    float dense[2][4];
    FILE *fp = fopen("test1.txt","r");
    for (row = 0; row < 2; row++){
        for (col = 0; col < 4; col++){
            lstm_val = fscan(fp);
            dense[row][col] = lstm_val;
        }
    }

    return 0;
}

fscan.c：

#include <stdlib.h>
#include <stdio.h>
#define MAXCN 50

float fscan(FILE *fp)
{   //FILE* lstm_txt = NULL;
    char lstm_weight[MAXCN] = {0};
    int lstm = 0;
    int i = 0;
    float lstm_val;
    
    while ((i + 1 < MAXCN) && ((lstm = fgetc(fp)) != ' ')  && (lstm != EOF)){
        lstm_weight[i++] = lstm;
    }
    printf("\n lstm_weight: %s\n\n", lstm_weight);
    lstm_val = atof(lstm_weight);
    printf("\n convert \"lstm_weight\" to lstm_val is : %f\n\n", lstm_val);
    return lstm_val;
 }

fscan.h：

#include <stdio.h>

extern float fscan(FILE *fp);

测试1.txt：

4.217959344387054443e-01 -2.566376626491546631e-01 2.173236161470413208e-01 4.217959344387054443e-01
2.173236161470413208e-01 4.217959344387054443e-01 4.217959344387054443e-01 -2.566376626491546631e-01

在第一行最后一个“4.217959344387054443e-01”和第二行第一个“2.173236161470413208e-01”之间输入图像描述 是一个回车，显然，遇到这个回车结果是错误的

结果是：

 lstm_weight: 4.217959344387054443e-01


 convert "lstm_weight" to lstm_val is : 0.421796


 lstm_weight: -2.566376626491546631e-01


 convert "lstm_weight" to lstm_val is : -0.256638


 lstm_weight: 2.173236161470413208e-01


 convert "lstm_weight" to lstm_val is : 0.217324


 lstm_weight: 4.217959344387054443e-01
2.173236161470413208e-01


 convert "lstm_weight" to lstm_val is : 0.421796


 lstm_weight:


 convert "lstm_weight" to lstm_val is : 0.000000


 lstm_weight: 4.217959344387054443e-01


 convert "lstm_weight" to lstm_val is : 0.421796


 lstm_weight: 4.217959344387054443e-01


 convert "lstm_weight" to lstm_val is : 0.421796


 lstm_weight: -2.566376626491546631e-01


 convert "lstm_weight" to lstm_val is : -0.256638

我怎样才能避免它？

标签： center

解决方案

I was about the write the solution but kudos to Mr. Rankin, he explain well. It is regarding with the escape sequences. For example Enter is actually \n where all those required for computer to understand and display it for you in a Newline(\n) or Tab(\t). Check this for more information : Wikipedia - Table of Escapes

If there is anything require omitting, such as , you have to implement it lstm != ',' . This is sometimes used in readability 42,376.98(forty-two-thousand-three-hundred-seventy-six-point-nine-eight) for example

Final code will be

while ((i + 1 < MAXCN) && ((lstm = fgetc(fp)) != ' ') && (lstm != '\n') && (lstm != EOF))

Check David C. Rankin answer and also wikipedia link for escape sequences. More about :

Also, the Linux man pages online (man7.org) can provide the proper usage for any standard function you may encounter.

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