Hi,all
I'm writing a simple c program on my m1 MacBook with vscode ,but when I complied the project, error occurs:
Undefined symbols for architecture arm64:
"_isDigitLetter", referenced from:
_main in 2330004044t34main-187053.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I installed and used vscode
and my program is :
//main.c
#include <stdio.h>
#include "digital.h"
int main() {
char input;
printf("Enter a character: ");
scanf("%c", &input);
printf("%c", isDigitLetter(input));
return 0;
}
//isdigit.c
#include "digital.h"
_Bool isDigitLetter(char c) {
return ((c >= '0') && (c<='9'));
}
//digital.h
#ifndef DIGITAL_H
#define DIGITAL_H
_Bool isDigitLetter(char c);
#endif // DIGITAL_H
Therese-ZHU
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