Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    float ans = 0.0f, pwr = 1;
    int flag = 0;
    while (*str != '\0') {
        if (*str == '+') flag = 0;
        else if (*str == '-') flag = 1;
        else if (*str == '.') pwr = 10.0f;
        else {
            if (pwr == 1) {
                ans = ans * 10.0f + (*str - '0');
            } else {
                ans += (float)(*str - '0')/pwr;
                pwr *= 10.0f;
            }
        }
        str++;
    }
    return flag ? -ans : ans;
}

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