# Concatenating characters

• 08-22-2003
fkheng
Concatenating characters
How can I concatenate characters in C?

and if those 2 characters are numbers for example, say char1 = 1, char2 = 4

so if i merge them, it will become 14

can i then manipulate htis value to perform mathematical calculations?
• 08-22-2003
Prelude
Make a string out of the characters, use strtol to turn the result into a number, repeat as necessary for other values, then do your calculations.
• 08-22-2003
WaltP
Re: Concatenating characters
Quote:

Originally posted by fkheng
How can I concatenate characters in C?

and if those 2 characters are numbers for example, say char1 = 1, char2 = 4

so if i merge them, it will become 14

can i then manipulate htis value to perform mathematical calculations?

You need to define a character buffer, like
char buf[10]; /* to hold a string of 9 characters */

Then add char1 and char2 into the buffer:
Code:

```buf[0] = char1; buf[1] = char2; buf[3] = '\0';    /* End the 'string' with a null */```
If you know they are numbers, use atoi() to convert them from a string into int
• 08-22-2003
fkheng
okay, er........say i have used atof to convert a string to float

it is a float number

and it looks like e.g. 60.00000

from this, what if i just want 2 floating points, i mean just 60.00

how do i shorten it to this?
• 08-22-2003
Dave_Sinkula
>and it looks like e.g. 60.00000

I might assume that looks means you have chosen the default precision by which printf displays the number's representation.

>from this, what if i just want 2 floating points, i mean just 60.00
>how do i shorten it to this?

If the above assumption is true, then you do nothing to the number; you change the precision by which you tell printf to display its representation. For example,
Code:

```#include <stdio.h> int main(void) {   double number = 60.0;   printf("number = %f\n",  number); /* default precision */   printf("number = %.2f\n", number); /* 2 digits after decimal point */   return 0; } /* my output number = 60.000000 number = 60.00 */```