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POInput validation from redirected stdin in C
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copied!<p>I am trying to write a programme in C for an assignment that detects CSV format eg. decimalcommadecimal. and gives a output as to if the file is in the required format or not. I have tried using various inputs from stdin and using isdigit etc. but to no success. I'm a mega noob and have barely done any C programming before, I attempted to use regexc but couldn't figure out the syntax for using it.</p> <pre><code>#include <ctype.h> #include <stdio.h> const char EOL = '\n'; int cbreak(void); int check_dig(void); int value =1; char c; int main() { while((scanf("%c" ,&c)) !=EOF&& value !=0) check_dig(); printf("\n%d\n",value); } int check_dig() { if (c == EOL) scanf("%c", &c); if (c == isdigit) scanf("%c", &c); else if (c == ',') scanf("%c", &c); else value = 0; } </code></pre> <p>Thanks Guys I'm now to this stage but stumped as how to finish, I need to printf either 1 or 0 depending on validation and I want to do this as suggested using a return value.</p> <pre><code>#include <ctype.h> #include <stdio.h> int check_digit(int); int check_comma(int); int skip_char(int); int main() { int c; while ((c = getchar()) !=EOF) if (check_digit(c)) skip_char(c); else if (check_comma(c)) skip_char(c); else return 0; } int check_digit(int c) { if (isdigit(c)) return 1; else return 0; } int check_comma(int c) { if (c == ',') return 1; else return 0; } int skip_char(int c) { c = getchar(); // will this skip 2 chars as i have a while loop that has c=getchar()?? return c; } </code></pre>

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