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# converting string to int

Posted on 2004-04-28
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Last Modified: 2010-04-15
hello.  I have a string that represents the coefficients of an equation.  i need to parse this and eventually convert each coefficient to it's integer or float equivalent.
for example,
"8 6 -6/7 +22/16 "
means 8 = 6(x1) -6/7(x2) +22/16(x3)

i'm thinking of using strtok( ) to get each of the coefficients separately, but then what do i do next? i tried to cast the string to an integer, but that doesn't work.   please help.  thank you.  i'm sorry i can't offer that many points for this, it's b/c i'm a new user.
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Question by:naz4viper
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6 Comments

LVL 30

Expert Comment

use atoi
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LVL 30

Accepted Solution

Axter earned 25 total points
Example:
char data[] = "123";
int num_data = atoi(data);
0

LVL 30

Expert Comment

If you need to convert it to float, then you can use atof
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LVL 9

Assisted Solution

ankuratvb earned 25 total points
Adding to what Axter has already pointed out,
atoi() & atof() require stdlib.h

And they take care of your signs as well,
if you have char ptr[]="-123";
int p=atoi(ptr);

then,p=-123;

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