Convert a String to Float

Code

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

float custom_atof(const char *str) {
float result=0.0;
int ispositive=1;
float afterdec=0;
float adpow=1.0;
int point=0;

if(*str=='-') ispositive=-1;

while(*str!='\0'){


    if(*str=='.')point=1;

    if(point==0){
        if(*str>='0'&&*str<='9'){
        result=result*10+(*str-'0');
        }
    }else{
        if(*str>='0'&&*str<='9'){
            afterdec=afterdec*10+(*str-'0');
            adpow*=10;
        }
    }
 
   str++;
}

    return (result+afterdec/adpow)*ispositive;
}

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