读取C语言中的行并将其转换为浮点数

Question

I have a text file that reads as such:

A 50
B 30
C 40

Currently my code opens this file and reads each line as thus:

#include <stdio.h>

int main(void)
{
    int file = 0;

    {
        char* filename = "commands.txt";
        FILE* file;
        file = fopen(filename, "a+");
        char line[BUFSIZ];
        while(fgets(line, sizeof(line), file)) {
            char first_letter = line[0];
            printf("%c", first_letter);
            float number = line[2 : end] 
            printf("%f", number)

        }
    }
    return 0;
}

The character variable first_letter is set to the letter. I have written 2:end but obviously that won't work. I would like to set the floating point variable 'number' to whatever the number is on that line. It may not necessarily be a 2 digit number.

Answer 1

Once you read, parse it using sscanf() :

  while(fgets(line, sizeof(line), file)) {
        char first_letter;
        float number;
        if( sscanf(line, "%c %f", &first_letter, &number) != 2)
        { /* handle error */ }
        printf("%c %f\n", first_letter, number);

    }