Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    int i = 0;
    int sign = 1;
    float result = 0.0;
    float fraction = 0.1;

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

    // Integer part
    while (str[i] >= '0' && str[i] <= '9') {
        result = result * 10 + (str[i] - '0');
        i++;
    }

    // Fractional part
    if (str[i] == '.') {
        i++;
        while (str[i] >= '0' && str[i] <= '9') {
            result = result + (str[i] - '0') * fraction;
            fraction = fraction / 10;
            i++;
        }
    }

    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