Thread: help..convert string to double

i want to mix my two codes, here's part 1:

Code:

#include<stdio.h>
#include<string.h>


void print(char str[]);

main()
{
    char num[16],copy[16];
    int i;

    puts("\n AMOUNT: $ ");
    gets(num);

    strcpy(copy,num);

    while(strlen(copy)<15){
        
        for(i=strlen(copy)+1;i>0;i--)
        copy[i]=copy[i-1];

        copy[0]=' ';
    }

    print(copy);

    printf("\nCheck Protection:\n\n");

    while(strlen(num)<15){
        for(i=strlen(num)+1;i>0;i--)
        num[i]=num[i-1];

        num[0]='*';
    }

    print(num);
    return 0;
}

void print(char str[])
{
    int copy;

    for(copy=0;copy<strlen(str);copy++)
    {
        printf("%c  ",str[copy]);
    }

    printf("\n-  -  -  -  -  -  -  -  -  -  -  -  -  -  -");
    printf("\n1  2  3  4  5  6  7  8  9 10 11 12 13 14 15\n\n");
}

part 2:

Code:

#include<stdio.h>
#include<math.h>

main()
{
    char *nineteen[30]={" ","ONE","TWO","THREE","FOUR","FIVE","SIX","SEVEN"
    ,"EIGHT","NINE","TEN","ELEVEN","TWELVE","THIRTEEN","FOURTEEN","FIFTEEN"
    ,"SIXTEEN","SEVENTEEN","EIGHTEEN","NINETEEN"};

    char *tenths[10]={" "," ","TWENTY","THIRTY","FOURTY","FIFTY","SIXTY",
    "SEVENTY","EIGHTY","NINETY"};

    char hundred[]="HUNDRED";
    char thousand[]="THOUSAND";
    char million[]="MILLION";

    int ones,ten,hun,thou,num,ten_thou,hun_thou,mil;
    double dec;


    printf("\nInput ? $");
    scanf("%lf",&dec);

    while(dec>9999999.99||dec<0){
        printf("\nINVALID INPUT!!");
        printf("\nInput ? $");
        scanf("%lf",&dec);
    }

    num=(int)dec;
    dec=(double)dec-num;

    printf("\nIn Words: \n\n ");

    if(num>=1&&num<=19){
    printf(" %s",nineteen[num]);
    }
    else if(num==0){
    printf(" Zero");
    }
    else{
        ones=num%10;
        num-=ones;
        ten=num%100;
        num-=ten;
        ten/=10;
        hun=num%1000;
        num-=hun;
        hun/=100;
        thou=num%10000;
        num-=thou;
        thou/=1000;
        ten_thou=num%100000;
        num-=ten_thou;
        ten_thou/=10000;
        hun_thou=num%1000000;
        num-=hun_thou;
        hun_thou/=100000;
        mil=num%10000000;
        num-=mil;
        mil/=1000000;



        if(mil>0)
        printf(" %s %s",nineteen[mil],million);

        if(hun_thou>0)
        printf(" %s %s",nineteen[hun_thou],hundred);

        if(ten_thou>0)
        printf(" %s",tenths[ten_thou]);

        if(thou>0)
        printf(" %s",nineteen[thou]);

        if(hun_thou>0||ten_thou>0||thou>0)
        printf(" %s",thousand);

        if(hun>0)
        printf(" %s %s",nineteen[hun],hundred);

        if(ten>0)
        printf(" %s",tenths[ten]);

        if(ones>0)
        printf(" %s",nineteen[ones]);
    }

    if(dec!=0)
    printf(" and %.0f/100",dec*100);

    printf("\n\n");
    return 0;
}

the first code gets num -which is a sting and the second scanf dec -double. can i convert string to double ?
can any body help me?
and give some examples?

sorry for my english.. =)

Code:

for (copy=0;copy<strlen(str);copy++)

This evaluates strlen(str) every time, which is really wasteful.

Read these:
> SourceForge.net: Gets - cpwiki
> SourceForge.net: Implicit main - cpwiki

In the first file, what's with all the copying? You manage to make two copies with four loops (why??), and I'm not sure what you're doing with all the -1 offset either. Just get the string (and don't use gets), and then print it.

In the second file, what if I enter 10 million? Your program can't handle it. If you ever run into this type of issue, don't simply copy/paste the code, instead, use a loop.

Or just use strtod() like TheBigH said

thanks a lot sir memcpy and sir ThebigH .
im just a newbie.