Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    float res=0.0,frac=0.1;
    int sign=1,i=0;
    if(str[i]=='-')
    {
        sign=-1;
        i++;

    }
    if(str[i]=='+')
    i++;
    while(str[i]>='0'&&str[i]<='9')
    {
        res=res*10+(str[i]-'0');
        i++;
    }
    if(str[i]=='.')
    {

    i++;
  while(str[i]>='0'&&str[i]<='9')
    {
        res=res+(str[i]-'0')*frac;
        frac/=10;
        i++;
    }
    }

    return sign*res;
}

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