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 = 0.0, frac = 0.0;
    int frac_div = 1;

    if (*str == '+') str++;
    else if (*str == '-') { str++; sign = -1; }

    while (*str != '\0' && *str != '.') {
        num = num * 10 + (*str - '0');
        str++;
    }

    if (*str == '.') {
        str++;
        while (*str != '\0') {
            frac = frac * 10 + (*str - '0');
            frac_div *= 10;
            str++;
        }
    }

    return sign * (num + frac / frac_div);
}

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