Combining 2 chars

Hello,

I am trying to combine to chars together, having a big of problem

Quote:

---

char char1;
char char2;


char1 = 'one';
char2 = ' two';


char1 = (char1[3] + char2[0];




printf("%s",char1);

---

what's the correct code?

'one' is not a single char, or a char string.

You cannot use the '+' operator to combine two strings.

Also, post code as CODE blocks not QUOTE blocks!

Look at this code, but be cautious about buffer overflow. More code would need to prevent overflow.

Code:

---

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

int main(void)
{
  char char1[20] = "one";
  char char2[10] = " two";

  // Or char *char2 = " two";  char2 is a pointer to a constant string
  // char1 must be a char array large enough to hold both strings

  strcat(char1, char2);

  printf("%s\n",char1);

  return 0;
}

---

You need to study a good up to date book on the C Programming Language before writing C code!

thanks,

so what exactly is '#include <string.h>' used for?

is it for 'strcat' can be used?

Quote:

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Originally Posted by WaterSerpentM

thanks,

so what exactly is '#include <string.h>' used for?

---

You need to include the correct header file for the declarations of Standard Library functions.

In this case you need to #include string.h for the declaration of the string concatenation function, strcat().

Please see the online manpage for strcat(), or if on Linux, use the command line command, "man strcat"

Once again, if you study a good up to date book on the C Programming Language, you would learn all about this an all the other details of the language!

Quote:

---

Originally Posted by rstanley

You need to include the correct header file for the declarations of Standard Library functions.

In this case you need to #include string.h for the declaration of the string concatenation function, strcat().

Please see the online manpage for strcat(), or if on Linux, use the command line command, "man strcat"

Once again, if you study a good up to date book on the C Programming Language, you would learn all about this an all the other details of the language!

---

thanks dude

ive tried to combine itself, but dont work

Quote:

---

strcat(char3, char3);

---

Quote:

---

Originally Posted by WaterSerpentM

ive tried to combine itself, but dont work

---

This is legal but I don't know why you would concatenate char3 with char3. char 3 was not in your original code.

You would need to post the entire code for me to comment on it!

[CODE] blocks, NOT [QUOTE] blocks!

[QUOTE=rstanley;1308879]This is legal but I don't know why you would concatenate char3 with char3. char 3 was not in your original code.

You would need to post the entire code for me to comment on it!

[CODE] blocks, NOT

Quote:

---

blocks!

---

Code:

---

    char char3 [40] = "three";
    char char4 [10] = " four";


    strcat(char3, char4);
    printf("\n");
    printf("%s",char3);


    strcat(char3, char3);


    printf("\n");
    printf("%s",char3);

---

You have an 's' at the end of the last printf() statement.

A better way of doing this:

Code:

---

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

int main(void)
{
  char char3 [20] = "three";
  char char4 [10] = " four";
  char char5[30] = "";  // Always initialize the local variables

  strcat(char3, char4);
  printf("\n");
  printf("%s",char3);

  strcpy(char5, char3); // A better method!
  strcat(char5, " ");  // Print a space inbetween
  strcat(char5, char3);


//  printf("\n"); Not needed
 
  printf("%s\n",char5);

  return 0;
}

---

Quote:

---

Originally Posted by rstanley

You have an 's' at the end of the last printf() statement.

A better way of doing this:

Code:

---

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

int main(void)
{
  char char3 [20] = "three";
  char char4 [10] = " four";
  char char5[30] = "";  // Always initialize the local variables

  strcat(char3, char4);
  printf("\n");
  printf("%s",char3);

  strcpy(char5, char3); // A better method!
  strcat(char5, " ");  // Print a space inbetween
  strcat(char5, char3);


//  printf("\n"); Not needed
 
  printf("%s\n",char5);

  return 0;
}

---

---

what does

Code:

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strcpy

---

do?

There is a function called sprintf() that could simplify this even more.

I assume this is a homework assignment.

Quote:

---

Originally Posted by rstanley

There is a function called sprintf() that could simplify this even more.

I assume this is a homework assignment.

---

its not an assignment, im learning how to calculate things right now

strcpy() copies an initial string into the destination, then strcat() adds strings to the end of the existing destination string.

Again, you need to study a good book that I will recommend in a later message.

Quote:

---

Originally Posted by rstanley

strcpy() copies an initial string into the destination, then strcat() adds strings to the end of the existing destination string.

Again, you need to study a good book that I will recommend in a later message.

---

yup, i see exactly how it works, just wanted to clarify it

thanks

WaterSerpentM:

If you are attempting to learn from painfully inadequate online tutorials, YouTube videos, or some book claiming to teach you in a short time, then THROW THEM AWAY!

Short of taking a course in C Programming from a qualified instructor, you need to study a good book on the C Programming Language, cover to cover, and do all the exercises at the end of each chapter! Choose one of the three listed below:

C Programming, A Modern Approach, 2nd Edition
Author: K. N. King

C Primer Plus, 6th Edition
Stephen Prata

C How to Program, 8/e
Deitel & Deitel

Studying one of these books, and writing code, you will have a much better understanding of the C Programming language.