Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    float result = 0.0;
    float fraction = 0.1;
    int sign = 1;
    int isFraction = 0;
    
    if(*str == '-') {
        sign = -1;
        str++;
    }
    else if (*str == '+') str++;

    while(*str) {
        if((*str >= '0') & (*str <= '9')) {
            uint8_t digit = *str - '0';
            if(!isFraction) {
                result = (result * 10) + digit;
            }
            else {
                result = result + digit * fraction;
                fraction *= 0.1;
            }
        }
        else if(*str == '.') {
            if(isFraction) break;
            isFraction = 1;
        }
        else {
            break;
        }
        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