将文本文件中的一行拆分为C中的单独变量

问题描述 投票:-1回答:2

我目前正在开发一个程序,该程序读入名为accident.txt的文件,其中包含致命交通事故的数据,并根据事故发生的时间将数据组织成三种不同的结构。

文本文件格式:

时间(24小时格式)numOfVehicles numOfFatalities

txt文件中的几行:

2   2   1
18  3   1
1   1   1
7   2   1
19  1   1

重要的是要注意它们由制表符(/ t)分隔。

我编写了整个程序,它应该工作,除了读取实际文件并分隔行存储到我的结构中。该计划的整个目标是将每个时间范围内涉及的事故,车辆和死亡事故的总量相加并输出。

while语句中的某些内容,特别是while语句的开头是不正确的。经过几个小时试图找出我做错了什么,我似乎无法弄明白。以下是我的代码。

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

// Structure for organizing file data
struct stats {
    int accidents, vehicles, fatalities;
    double vehAccRat;
};

int main(void) {
    // Declare file pointer
    FILE *fp;

    char line[256];

    // Declare file name
    char* filename = "accidents.txt";

    // Declare structure variables
    struct stats morning;
    struct stats afternoon;
    struct stats night;

    // Open a file using fopen function then assign it to the file pointer
    fp = fopen(filename, "r");

    // If file is not found, exit program
    if (!fp){
        printf("Could not open file %s",filename);
        exit(1);
    } // End of if statement

    // Iterate through file by each line and store data into respective time frame
    while (fgets(line, sizeof(line),fp) != NULL) {
        // Store line data in array
        char *val1 = strtok(NULL, "/t");
        char *val2 = strtok(NULL, "/t");
        char *val3 = strtok(NULL, "/t");

        // If time is from 6 - 12 add data to morning statistics
        if (val1 <= 6 && val1 >= 12) {
            morning.accidents += 1;
            morning.vehicles += val2;
            morning.fatalities += val3;
        } // End of if statement

        // If time is from 13 - 19 add data to afternoon statistics
        else if (val1 <= 13 && val1 >= 19) {
            afternoon.accidents += 1;
            afternoon.vehicles += val2;
            afternoon.fatalities += val3;
        } // End of else if statement

        // If time is from 20 - 23 or 0 - 5 add data to night statistics
        else if ((val1 <= 20 && val1 >= 23) || (val1 <= 0 && val1 >= 5)) {
            night.accidents += 1;
            night.vehicles += val2;
            night.fatalities += val3;
        } // End of else if statement
    } // End of while loop

    // Close the file stream
    fclose(fp);

    // Calculate vehicle / accident ratio for each time group
    morning.vehAccRat = morning.vehicles / morning.accidents;
    afternoon.vehAccRat = afternoon.vehicles / afternoon.accidents;
    night.vehAccRat = night.vehicles / night.accidents;

    // Output data organized by time of day (morning/afternoon/night)
    printf("Time Span\tAccidents\tVehicles\tFatals\t\tVeh./Acc.\n");
    printf("-------------------------------------------------------------------------\n");
    printf("Morning\t\t%d\t\t%d\t\t%d\t\t%.4f\n", morning.accidents, morning.vehicles, morning.fatalities, morning.vehAccRat);
    printf("Afternoon\t%d\t\t%d\t\t%d\t\t%.4f\n", afternoon.accidents, afternoon.vehicles, afternoon.fatalities, afternoon.vehAccRat);
    printf("Night\t\t%d\t\t%d\t\t%d\t\t%.4f\n", night.accidents, night.vehicles, night.fatalities, night.vehAccRat);
    printf("-------------------------------------------------------------------------");

} // End of int main(void)

在此先感谢您的帮助,我完全被难过了。

c
2个回答
0
投票

我注意到的一件事是第一次调用strtok应该有字符串标记,然后后续的具有NULL,但你的所有都有NULL。


0
投票

我认为sscanffscanf将是你的朋友。

可以用以下代码替换循环,以将每行的三个值中的每一个读取为整数:

 int val1, val2, val3;
 while(fscanf(fp, "%d%d%d", &val1, &val2, &val3) == 3){

您也可以在当前的实现中使用sscanf上的line,但这感觉不必要。

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