Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    int sign = 1;
    int i = 0;
    float result = 0.0f;
    float div = 10.0f;
    float fraction = 0.0f;
    int is_dot = 0;

    if(str[i] == '-')
    {
        sign = -1;
        i++;
    }
    else if(str[i] == '+')
    {
        i++;
    }

    while(str[i]>='0' && str[i]<='9' || str[i] == '.')
    {
        char ch = str[i];

        if(ch == '.')
        {
            is_dot = 1;
        }
        else
        {
            int num = str[i] - '0';
            if(is_dot)
            {
                fraction = fraction + num / div;
                div *= 10.0f;
            }
            else
            {
                result = result * 10.0f + num;
            }
        }
        i++;
    }

    return (sign * (result + fraction));
}

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