Question

How to use clearerr() function to clear error indicators of file pointer in C

Answer 1

#include <stdio.h>

int main(void)
{
    FILE* fp;
    fp = fopen("d:\\data.txt", "r");
    if (fp == NULL) {
        perror("Error open file");
    }
    else {
        fputc('a', fp);
        
        if (ferror(fp)) {
            printf("Error writing to file\n"); // open file with "r"
            clearerr(fp);
        }
        
        char ch = fgetc(fp);
        printf("ch = %c\n", ch);
        
        if (!ferror(fp)) {
            printf("reading file ok\n");
        }

        fclose(fp);
    }

    return 0;
}



/*
run:

Error writing to file
ch = H
reading file ok

*/

 

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