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Top Forums Programming C. To segmentation fault or not to segmentation fault, that is the question. Post 303032358 by Corona688 on Friday 15th of March 2019 02:37:43 PM
Old 03-15-2019
Working by sheer coincidence. Going beyond the end of the array means you can't predict what data you'll find there. To avoid out of bounds errors, stay in bounds.

And now the way you're supposed to do it:

Code:
int main(int argc, char *argv[])
{
    int NUM_1, NUM_2, CHARACTER;

    if (argc <= 3)
    {
        printf("ERROR!\n\n");
        printf("Not enough arguments!\n");
        exit(1);
    }
    NUM_1 = strtod(argv[1], NULL);
    NUM_2 = strtod(argv[3], NULL);
    CHARACTER=*argv[2];
    printf("\n%i, %i, %c\n\n", NUM_1, NUM_2, CHARACTER);

    return(0);
}

Should work on older compilers.
This User Gave Thanks to Corona688 For This Post:
 

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ARG(2)								System Calls Manual							    ARG(2)

NAME
ARGBEGIN, ARGEND, ARGC, ARGF, arginit, argopt - process option letters from argv SYNOPSIS
#include <u.h> #include <libc.h> ARGBEGIN { char *ARGF(); Rune ARGC(); } ARGEND extern char *argv0; /* Alef only */ Arg *arginit(int argc, byte **argv); Rune argopt(Arg *arg); byte *argf(Arg *arg); DESCRIPTION
These macros assume the names argc and argv are in scope; see exec(2). ARGBEGIN and ARGEND surround code for processing program options. The code should be the cases of a C switch on option characters; it is executed once for each option character. Options end after an argu- ment --, before an argument -, or before an argument that doesn't begin with -. ARGC() returns the current option character. ARGF() returns the current option argument: a pointer to the rest of the option string if not empty, or the next argument in argv if any, or 0. ARGF must be called just once for each option that takes an argument. After ARGBEGIN, argv0 is a copy of argv[0] (conventionally the name of the program). After ARGEND, argv points at a zero-terminated list of the remaining argc arguments. Alef The Alef argument processing routines are unrelated. Instead, an aggr called Arg is initialized by a call to arginit. Successive calls to argopt return successive option characters, or zero at the end of the options. After a call to argopt, argf will return any argument string associated with the option. EXAMPLES
This C program can take option b and option f, which requires an argument. #include <u.h> #include <libc.h> void main(int argc, char *argv[]) { char *f; print("%s", argv[0]); ARGBEGIN { case 'b': print(" -b"); break; case 'f': print(" -f(%s)", (f=ARGF())? f: "no arg"); break; default: print(" badflag('%c')", ARGC()); } ARGEND print(" %d args:", argc); while(*argv) print(" '%s'", *argv++); print(" "); exits(0); } Here is the output for the run prog -bffile1 -r -f file2 arg1 arg2 prog -b -f(file1) badflag('r') -f(file2) 2 args: 'arg1' 'arg2' This Alef program accepts options b and, with an attached file name, f. #include <alef.h> void main(int argc, byte **argv) { int a, ac, bflag; byte *file; Arg *arg; arg = arginit(argc, argv); while(ac = argopt(arg)) switch(ac){ case 'b': bflag = 1; break; case 'f': file = argf(arg); break; } for(a=0; a<arg->ac; a++) print("argument %s ", arg->av[a]); } SOURCE
/sys/include/libc.h ARG(2)
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