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#include "./main.h"
void printhelp() {
fprintf(stderr, "even: a binary by ZachIR to check if a number is even or ");
fprintf(stderr, "odd.\n");
fprintf(stderr, "even [-hcv]\n");
fprintf(stderr, "even [--help]\n");
fprintf(stderr, "even [--copyright]\n");
fprintf(stderr, "even [--version]\n");
fprintf(stderr, "even [-q] [--quiet] NUMBER\n");
fprintf(stderr, "\t-h: prints this help message\n");
fprintf(stderr, "\t-c: prints the copyright information\n");
fprintf(stderr, "\t-v: prints the version\n");
fprintf(stderr, "\t-q: just uses error codes, no text\n");
return;
}
void printcopyright() {
fprintf(stderr, "Copyright (c) 2024 Zachary Smith\n");
fprintf(stderr, "even is Free software under the MIT license, and is ");
fprintf(stderr, "provided without warranty of any kind.\n");
return;
}
void printversion() {
fprintf(stderr, "even version %s, 2024\n", VERSION);
return;
}
int main(int argc, char **argv) {
bool quiet;
size_t string_length;
uint8_t digit;
digit = 0;
quiet = false;
string_length = 0;
if (argc > 1) {
for (size_t i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
switch (argv[i][1]) {
case 'h':
printhelp();
return SUCCESS;
case 'c':
printcopyright();
return SUCCESS;
case 'v':
printversion();
return SUCCESS;
case 'q':
quiet = true;
break;
default:
printhelp();
return -1;
}
}
}
assert(strlen(argv[argc - 1]) < SIZE_MAX);
string_length = strlen(argv[argc - 1]);
digit = argv[argc - 1][string_length - 1];
digit -= '0';
if (quiet) {
if (digit <= 10)
return ((digit & 1) == 0) ? SUCCESS : ERR;
} else {
if ((digit & 1) == 0) {
fprintf(stdout, "even\n");
} else {
fprintf(stdout, "odd\n");
}
return SUCCESS;
}
}
return ERR;
}
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