Convert a String to Float

Code

#include <stdio.h>
#include <stdint.h>

float custom_atof(const char *str) {
    // Your logic here
    int sign = 1;
    float num = 0;
    char comma_spotted = false;
    float pow = 10;
    if (*str == '-' || *str == '+')
    {
        sign = (*str == '-') ? -1 : 1;
        str++;
    }
    while (*str)
    {
        if (*str == '.')
        {
            comma_spotted = true;
            str++;
            continue;   
        }
        if (comma_spotted)
        {
            num += (float)(*str - '0') / pow;
            pow *= 10;
        }
        else
            num = num * 10 + (*str - '0');
        str++;
    }
    return num * sign;
}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    uint8_t i = 0;
    while (str[i]) {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    float value = custom_atof(str);
    printf("%.2f", value);
    return 0;
}

Solving Approach