File Input Output MCQs

What will be the output of the following C code?

#include <stdio.h>
void main()
{
    char *p = calloc(100, 1);
    p = "welcome";
    printf("%s\n", p);
}

Explain the format string "%5d%s %c"

What is the difference between %e and %g?

Strcat() function adds null character.

What is the size of array "line" used in fgets(line, maxline, *fp) function?

What will be the output of the following C statement?

int ungetc(int c, FILE *fp)

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

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

What does the ungetc function return for the following C expression?

ungetc(c, fp);//where declarations are int c and FILE *fp

If the user enters 1 3.2 s, what value will be returned by the scanf()?

scanf("%d %f %c", &s1, &s2, &s3);