Sum two string variables 2

[thinICE80]

Hi,
anyone knows how to sum two string variables, I've tried with strcat but this function accept as the second parameter only a constant string. I want to do something like this:

char var1[10], var2[10], var3[20];

var1 = strcpy(var1,"hewhwho");
var2 = strcpy(var2,"fhhgoehg");
var3 = strcat(var1,var2);

Thanks for your help.

 

[ArkM]

I've tried with strcat but this function accept as the second parameter only a constant string
All right then non-constant arg is accepted too, that's all.
Let's remember:
strcpy(s1,s2) is the same as s1 = s2, s1 != s2.
strcat(s1,s2) is the same as s1 = s1 + s2, s1 != s2.
These functions returns 1st arg (i.e. a pointer to the 1st modified array of char) and both are very dangerous (char array overwriting possible).
May be it helps in your homework? Read this forum rules... Good luck!

 

[cpjust]

non-const variables can automatically be promoted to const, but const variables cannot be demoted to non-const without an explicit cast.

char* var1 = "non-const data";
const char* var2 = var1;  /* char* becomes const char* -- OK. */
char* var3 = var2;  /* Error!  const char* cannot become char*. */