File Input Output- C Programming MCQ Questions and Answers

#include <stdio.h>
int X(char *s, FILE *iop)
{
    int c;
    while (c = *s++)
    putc(c, iop);
    return ferror(iop) ? EOF : 0;
}

#include <stdio.h>
int main()
{
    char n[20];
    fgets(n, 19, stdin);
    ungetc(n[0], stdin);
    scanf("%s", n);
    printf("%s\n", n);
    return 0;
}

#include <stdio.h>
#include <stdarg.h>
void func(int, ...);
int main()
{
    func(2, 3, 5, 7, 11, 13);
    return 0;
}
void func(int n, ...)
{
    int number, i = 0;
    va_list start;
    va_start(start, n);
    while (i != 3)
    {
        number = va_arg(start, int);
        i++;
    }
    printf("%d", number);
}

#include <stdio.h>
int main()
{
    char n[] = "hello\nworld!";
    char s[13];
    sscanf(n, "%s", s);
    printf("%s\n", s);
    return 0;
}

#include <stdio.h>
#include <ctype.h>
int main()
{
    int i = 32;
    if (isspace(i))
        printf("space\n");
    else
        printf("not space\n");
        return 0;
}

#include <stdio.h>
#include <stdarg.h>
int f(int c, ...);
int main()
{
    int c = 97;
    float d = 98;
    f(c, d);
    return 0;
}
int f(int c, ...)
{
    va_list li;
    va_start(li, c);
    float d = va_arg(li, float);
    printf("%f\n", d);
    va_end(li);
}

char or EOF.isalnum(c) returns