Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    bool sign = false;
    int i=0;
    if(str[i]=='-'){
        sign = true;
        i++;
    }
    else if(str[i]=='+'){
        i++;
    }
    bool dot = false;
    int num = 0;
    float dec = 0.0f;
    float frac = 10.0f;
    while(str[i]!='\0'){
        if(str[i]=='.'){
            dot = true;
            i++;
            continue;
        }
        int digit = str[i]-'0';
        if(dot){
            dec += digit/frac;
            frac *=10.0;
        }
        else{
            num=(num*10)+digit;
        }
        i++;
    }
    if(sign){
        return -1*(num+dec);
    }
    
    return num+dec;
}

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