Convert a String to Float

Code

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

float custom_atof(const char *str) {
    float result = 0.0f;
    int sign = 1;
    if (*str == '-') {
        sign = -1;
        str++;
    } else if (*str == '+') {
        sign = 1;
        str++;
    }
    bool meet_point = false;
    while(*str != '\0') {
        if (!meet_point && *str == '.') {
            meet_point = true;
            str++;
            break;
        }
        result = result * 10 + (*str - '0');
        str++;
    }
    float exponent = 1.0f;
    while (*str != '\0') {
        exponent *= 10.0f;
        result += (*str - '0') / exponent;
        str++;
    }
    return sign * result;
}

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