Question

How to get errno in C

Answer 1

#include <stdio.h>
#include <stdlib.h>

int main() {
    const char* filename = "d:\\example.txt";

    FILE* fp = fopen(filename, "r");

    if (fp == NULL) {
        fprintf(stderr, "Error open file");
        printf(", errno = %d", errno); // 2 = no file name with this name
        exit(1);
    }


    return 0;
}



/*
run

Error open file, errno = 2

*/

 

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