if else statement double printing C -


i'm writing program adds line numbers c files. filenames command line arguments wanted user have chance enter them if forget when run program. ask user if want enter filenames , answer 'y' or 'n'. given 5 tries answer correctly if invalid character entered after 5 tries program prints error message , terminates. if user enters invalid character have print '[y/n]?' screen prompt user letters. if invalid character entered though goes through loop twice , prints them out side side. why happen?

compiler.c file:

#include <stdio.h> #include <stdlib.h> #include <string.h> #include "linenumadderheader.h" #include "miscellaneousheader.h" #include "errorcheckedfunctionsheader.h"  int main(int argc, char *argv[]){ int = 1; char ch; int answertries = 0; char *seperatedfilenames[argc - 1];  if (argc < 2){     fprintf(stderr, "no files entered compiling.\n");      answer: do{         if (answertries == 0)             printf("would enter files compiling [y/n]? ");         else if (!(answertries < 5))              fatal("in main(). invalid character entered many times.");         else             printf("[y/n]? ");          ch = getchar();          if (ch == 'n' || ch == 'n')             exit(0);          answertries++;     } while (ch != 'y' && ch != 'y'); } else{     while (i < argc){         seperatedfilenames[i - 1] = argv[i];         i++;     } }  = 0; while (i < (argc - 1)){     linenumadder(seperatedfilenames[i]);     i++; } }

fatal funciton:

/*displays fatal error*/ void fatal(char *errormessage){ /*holds errormessage*/ char completederrormessage[strlen(errormessage) + 17];  /*copies error message completederrormessage*/ strcpy(completederrormessage, "[!!] fatal error "); strcat(completederrormessage, errormessage);  /*prints error message screen*/ fprintf(stderr, "%s\n", completederrormessage);  /*exit program in failure*/ exit(-1); }

your getchar() call returns 1 character standard input. when users enters answer, hits enter/return key translates new line character part of line sent standard input.

what should check first character returned getchar , then, in loop, read , discard characters until new line character (\n). then, can proceed ask question time.

you should use loop because user may enter several characters @ once. example may enter "yes" count 4 characters.


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