Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    int sign = 1;
    int entier = 0; 
    float decimal = 0;
    
    int i = 0;
    float result = 0;
    if(str[i] == '-'){
        sign = -1;
        i++;
    }
    else if(str[i] == '+'){
        i++;
    }
    while(str[i] >= '0' && str[i] <= '9'){
        entier = entier * 10 + (str[i] - '0');      
         i++;
    }


    if (str[i] == '.') {
        i++;
        float diviseur = 10.0f;
        while (str[i] >= '0' && str[i] <= '9') {
            decimal += (str[i] - '0') / diviseur;
            diviseur *= 10.0f;
            i++;
        }
    }

    result = (float)entier + decimal;
    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