File Input Output
practice.

Identify X library function for line input and output in the following C code?

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

What specifies the minimum number of characters to print after being padded with zeros or blank spaces?

What will be the output of the following C code?

#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;
}

What symbol is used to Left-justify within the data given field width?

What will be the output of the following C code?

#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);
}

What will be the output of the following C code?

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

What will be the output of the following C code?

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

What will be the output of the following C code?

#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);
}

The functions vprintf(), vfprintf(), and vsprintf() are not equivalent to the corresponding printf() functions except the variable argument list.

Which is true about isalnum(c), where c is an int that can be represented as an unsigned?

char or EOF.isalnum(c) returns

Which of the following is used during memory deallocation in C?

What is the difference in the ASCII value of capital and non-capital of the same letter is?

In the following C program, every time program is run different numbers are generated.

#include <stdio.h>
int main()
{
    srand(time(NULL));
    printf("%d\n", rand());
    return 0;
}

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    int i = 10, j = 3, k = 3;
    printf("%d %d ", i, j, k);
}

Select the right explanation for the following C code snippet.

int fgetpos(FILE *stream, fpos_t *s)

What will be the output of the following C code if 2 characters is typed by the user?

#include <stdio.h>
#include <string.h>
int main()
{
    char line[3];
    fgets(line, 3, stdin);
    printf("%d\n", line[2]);
    return 0;
}

What will be the output of the following C code?

char str[] =”Too Good”;
printf(“\n %7s”,str);

What will be the output of the following C code?

#include <stdio.h>
#include <math.h>
void main()
{
    int k = pow(2, 3);
    printf("%d\n", k);
}

Which of the following library function is not case-sensitive?

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    char *s = "myworld";
    int i = 9;
    printf("%*s", i, s);
}