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 res = 0.0f;
    float frac = 0.0f;
    float div = 1.0f;
    int dt = 0;
    
    if(str[i] == '-'){
        sign = -1;
        i++;
    }else if(sign == '+'){
        i++;
    }

    while(str[i] != '\0'){
        if(str[i] >= '0' && str[i] <= '9'){
            if(!dt){
                res = res * 10 + (str[i] - '0'); ///integer part
            }else{
                frac = frac * 10 + (str[i] - '0'); ///fraction part
                div *= 10; //divisor increament by number of fraction points
            }
        }else if(str[i] == '.'){
            dt = 1;
        }

        i++;
    }

    return sign * (res + 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