How to use tcl apis in a c code

Question

I want to use some of the functionalities(APIs) of my tcl code in another \"c\" code file. But i am not getting how to do that especiallly how to link them. For that i have take

Answer 1

I think i have sloved it out. You were correct. The problem was with the include method that i was using. I have the files tcl.h, tclDecls.h and tclPlatDecls.h included in the c code but these files were not existing in the path /usr/include so i was copying these files to that directory, may be it was not a proper way to do. Finally i have not copied those files to /usr/include and gave the include path while compiling. I have created executable and it is givingthe proper result on terminal. Thanks for your help.

Here is the exact c code i am using :

#include 
#include 
#include 
#include 
#include 
#include 


int main (int argc, char **argv) {
Tcl_Interp *interp;
int code;
char *result;

printf("inside main function \n");
//    Tcl_InitStubs(interp, "8.5", 0);
Tcl_FindExecutable(argv[0]);
interp = Tcl_CreateInterp();
code = Tcl_Eval(interp, "source simple_addition.tcl; add_two_nos");

/* Retrieve the result... */
result = Tcl_GetString(Tcl_GetObjResult(interp));

/* Check for error! If an error, message is result. */
if (code == TCL_ERROR) {
    fprintf(stderr, "ERROR in script: %s\n", result);
    exit(1);
}

/* Print (normal) result if non-empty; we'll skip handling encodings for now */
if (strlen(result)) {
    printf("%s\n", result);
}

/* Clean up */
Tcl_DeleteInterp(interp);
exit(0);

}

And to compile this code and to generate executable file i am using below command :

gcc simple_addition_wrapper_new.c -I/usr/include/tcl8.5/ -ltcl8.5 -o simple_addition_op

I have executed the file simple_addition_op and got below result which was proper

inside main function 
c is 30 .......

My special thanks to Donal Fellows and Johannes