# Electronic Circuits and Projects Forum

1. ## Converting Array to integer

Hello All:

Would appreciate some help on converting the contents of an array to an integer. User enters data and it is stored into an array, but how can i convert the contents to an integer.

Here is what I have for adding the data to the array, until either 3 characters are entered from 0-9 or until the escape or enter key.

Say the user enters 1 and then enter, the array would be 100, or the user could enter 001 and then enter, the value is 1 but how to pull it out of the array so it is a number of 1. I suppose I could pad the array with FF and test each value in the array, and multiply the placeholders by 1,10,100 and add them together?. Any suggestions ?.

Code :
```
unsigned char i;
unsigned int array[3];
unsigned char x;

do {
while(!DataRdyUSART());       //polls receive buffer for available data
if ( ('0' <= i) && (i <= '9') && (x >=0) )
{
printf("%c",i,0);   //display on terminal;
x--;
}

}

while ( 13 != i && 27 != i);```

2. what if he enters something else, string for example?

3. Can't as the code only allows 0-9 to be to be entered, unless I am missing something?

4. can integer be negative?

if not you could do something like

Code :
```        unsigned char i;
//unsigned int array[3];
unsigned char x;
int temp;

do {
temp=0;  // init temp as zero
while(!DataRdyUSART());       //polls receive buffer for available data
if ( ('0' <= i) && (i <= '9') && (x >=0) )
{
temp=temp*10;  // adding digit, multiply temp by 10 and then...
temp=temp+ i - '0'; // add current digit
}

}

while ( 13 != i && 27 != i);```

5. Thank you very much panic mode. That did the trick. So simple and efficient, can get rid of the array.

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