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compile program with command line arguments

Hi,

I have a program which is hard coded, I need to enter a value(n2 in the below code) in the program, and the program processes the file according to the value n2.

how I compile now is as follows:
cc -o test testprog.c
./test [filename]

        if((data[0]=='8')&&(data[1]=='2'))

                {

                        memcpy(&l1,data+2,sizeof(int));

                        memcpy(&l2,data+6,sizeof(int));

                        memcpy(&n1,data+13,sizeof(int));

                        memcpy(&n2,data+17,sizeof(int));

                        memcpy(&n3,data+21,sizeof(int));

/*                        if(n2==81798)*/

/*                        if(n2==82060)*/

/*                        if(n2==82169)*/

/*                        if(n2==1795)   */

/*                        if (n2 == 1854) */

/*                      if (n2 == 1830)*/ 

                        if (n2 == 41388) 

                        {

                                printf("\t<Sin> 1stNode [%d] 1stLink [%d] 2ndNode [%d] 2ndLink [%d] 3rdNode [%d]\n",n1,l1,n2,l2,n3);

                        }

                        else

                        {

                                fwrite(data,128,1,fp_out);

                        }

                        iSin++;

                }

What I need to do is, modify the program in such a way that, the value n2 can be given as an argument at command line.

Can anyone please help me with this?

thanx
Squirrel

i dont do C but can you just ask for user input and use scanf() to get it?? and the code you posted, is that just a snip of the total code? cause you need some more stuff for it to compile right.

Yes, It is the snip of the total code.
Iam new to programing and not knowing how to modify.

Here is the full code:

#include  "check_2ndkj.h"

int CS_write();



main(int argc,char *argv[])

{

int i_FValue;

FILE        *fp_MYFILE;

        if(argc != 2)

        {

                printf("\tErr -> command line\n");

                printf("\t MYFileName\n");

                exit(NO);

        }

        else

        {

                printf("\tCommand accepted  -> check_K source %s\n",argv[1]);

        }



/*----------------------------------------------------------*/

/*                                fopen                            */

/*----------------------------------------------------------*/

        if(NULL==(fp_MYFILE=fopen(argv[1],"r")))

        {

                printf("file open Err! -> %s\n",argv[1]);

                exit(NO);

        }



/*----------------------------------------------------------*/

/*CS_write()                                */

/*----------------------------------------------------------*/

        i_FValue        =        CS_write(fp_MYFILE);

        if(i_FValue==NO)

        {

                printf("\tErr CS_write( )\n");

                exit(NO);

        }



/*----------------------------------------------------------*/

/*                        fclose                                        */

/*----------------------------------------------------------*/

        fclose(fp_MYFILE);

}



/*----------------------------------------------------------*/

/*                CS_write( )                */

/*----------------------------------------------------------*/

CS_write(fp_MYFILE)



FILE        *fp_MYFILE;

{

unsigned char        data[128];

int i_KjNum,i_NetworkNum,i_PolygonNum,i_TNum,i_ZNum,i_SNum,i_KNum;

int i_cnt;

int n1,l1,n2,l2,n3;

int iSin,iIpo;

int i_1;

FILE *fp_out;



        if(NULL==(fp_out=fopen("Uxxxxxx","w")))

        {

                printf("file open Err! -> Uxxxxxx\n");

                exit(NO);

        }

        printf("\tCS_write_Sin( )\n");

        iSin=0;

        iIpo=0;



/*------------------*/

/*  store    */

/*------------------*/

        fread(data,sizeof(data),1,fp_MYFILE);

        memcpy(&i_KjNum,data+91,sizeof(i_KjNum));

        memcpy(&i_NetworkNum,data+95,sizeof(i_NetworkNum));

        memcpy(&i_PolygonNum,data+99,sizeof(i_PolygonNum));

        memcpy(&i_TNum,data+103,sizeof(i_TNum));

        memcpy(&i_ZNum,data+107,sizeof(i_ZNum));

        memcpy(&i_SNum,data+111,sizeof(i_SNum));

        memcpy(&i_KNum,data+115,sizeof(i_KNum));



        i_1=i_KNum-1;

        memcpy(&(data[115]),&i_1,sizeof(i_KNum));



        fwrite(data,128,1,fp_out);



/*check*/

printf("%d %d %d %d %d %d %d \n", i_KjNum,i_NetworkNum,i_PolygonNum,i_TNum,i_ZNum,i_SNum,i_KNum);



for(i_cnt=0;i_cnt<i_KjNum+i_NetworkNum+i_PolygonNum+i_TNum+i_ZNum+i_SNum;i_cnt++)

        {

                memset(data,0x00,128);

                fread(data,sizeof(data),1,fp_MYFILE);

                fwrite(data,128,1,fp_out);

        }



        for(i_cnt=0;i_cnt<i_KNum;i_cnt++)

        {

                fread(data,sizeof(data),1,fp_MYFILE);

                if((data[0]=='8')&&(data[1]=='2'))

                {

                        memcpy(&l1,data+2,sizeof(int));

                        memcpy(&l2,data+6,sizeof(int));

                        memcpy(&n1,data+13,sizeof(int));

                        memcpy(&n2,data+17,sizeof(int));

                        memcpy(&n3,data+21,sizeof(int));

/*                        if (n2 == 1854) */

/*                        if (n2 == 1830)*/ 

                        if (n2 == 41388        

{

                        

printf("\t<Sin> 1stNode [%d] 1stLink [%d] 2ndNode [%d] 2ndLink [%d] 3rdNode [%d]\n",n1,l1,n2,l2,n3);

                        }

                        else

                        {

                                fwrite(data,128,1,fp_out);

                        }

                        iSin++;

                }

                if((data[0]=='8')&&(data[1]=='1'))

                {

                        fwrite(data,128,1,fp_out);

                        iIpo++;

                }

        }

        

        printf("\t iIpo [%d] iSin [%d]\n",iIpo,iSin);

        fclose(fp_out);

        return(OK);

}

main(int argc,char *argv[])

Argc contains the number of items on the command line, including the command. Argv is an array of C-strings, one for each item. Argv [0] is the command, argv [1] is the first argument, argv [2] is the second argument, etc.

sscanf(argv[1],"%d",&n2);

HTH.

Now, Info, I can't believe you recommend that schlocky code. What if the user doesn't put a number there?

Sorry for that, Dawei.
I'd be more careful while giving advice next time.

if(sscanf(argv[1],"%d",&n2)!=1) 

  Uhoh(TroubleInRiverCity);

Wat do I need to add or change at the IF loop of n2 ?? Can u please explain me a bit more clearly?? Sorry for the trouble!!