Convert a String to Float

Code

#include <stdio.h>
#include <stdint.h>
float custom_atof(const char *str) {
    int i=0,num=0,div=0;
    if(str[0]=='+' || str[0]=='-') i=1;
    for(;str[i];i++){
        div*=10;
        if(str[i]!='.'){
            num*=10;
            num+=str[i]-'0';
        }
        else{
            div=1;
        }
    }
    if(str[0]=='-') num=-num;
    if(div) return float(num)/div;
    else return float(num);
}
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