在C wierd输出中读写CSV文件

Question

I'm new to C language and I'm trying to save data to a .csv and read the same data in a very simple program.

    char c;

    FILE *fp;
    fp = fopen("file.csv", "w+");
    fprintf(fp, "Hello;World\nLine");
    fclose(fp);
    fp = fopen("file.csv", "r");
    while (getc(fp) != EOF) {
        printf("%c", getc(fp));
    }

    fclose(fp);

I don't know why the output is wrong:

el;ol
ie

Thanks in advance

Answer 1

Because you are reading a character in the loop condition (so it prints out every other one when printing), and reading another one when printing it out. Try this:

int ch;
while ((ch=getc(fp)) != EOF) {
    printf("%c", ch);
}

Answer 2

Here:

while (getc(fp) != EOF) {
    printf("%c", getc(fp));
}

You are calling getc() twice every time through the loop, but only printing one character. So you get half te hrces rm te fl n ls h ohr hl.