Question

There is a function that takes string as a parameter/argument.

Func(char* strA)
{
...
}

I have two strings;

#define FIRST "first"
char efg[] = " second";

I want to basically send "first second" as argument to Func(strA), but I do not want to use strcat(FIRST, efg); as it would permanently change my macro FIRST.

Is there a way to send "first second" as argument without upsetting the macro above?

Answer 1

You can use of sprintf function to write first in a temp buffer:

#define FIRST "first"
char efg[] = " second";  
char* space = " ";
char* strA = calloc(strlen(FIRST) + strlen(space) + strlen(efg) + 1, sizeof(char));  

sprintf(strA,"%s%s%s",FIRST, space, efg);

Func(strA);  

free(strA);  

Give it a Try!!

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Note: don’t forget free() dynamic allocated memory.

Description:
The sprintf() function is just like printf(), except that the output is sent to buffer. The return value is the number of characters written.