File Input Output MCQs

Output justification such as decimal point, numerical sign, trailing zeros or octal are specified.

function fabs defined math.h header file takes the argument of type integer.

What will be the output of the following C code considering user typed jkl?

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

Which of the following is NOT a delimiter for an input in scanf?

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

char or EOF.isupper(c) returns

What will be the output of the following C code?

#include <stdio.h>
#include <math.h>
void main()
{
    int k = fabs(-87);
    printf("%d\n", k);
}

gets() function checks overflow run.

In linux, apart from including math header file, the program is successfully executed by which of the following?

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    char i = '9';
    if (isdigit(i))
        printf("digit\n");
    else
        printf("not digit\n");
        return 0;
}