Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    int s=1;
    int d=0;
    int r=0;
    float cnt=1;
    for(int i=0;i<sizeof(str)-2;i++)
    {
        if(str[i]=='\0') break;
        else if(str[i]=='.') d=1;
        else if(str[i]=='-') s=-1;
        else if(str[i]=='+') s=1;
        else 
        {
            r=r*10+(str[i]-48);
            if(d==1) cnt*=10;
        }
    }
    return (s*r)/(cnt);
}

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

 

 

 

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Input

123.45

Expected Output

123.45