21. 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;
}
#include <stdio.h>
int X(char *s, FILE *iop)
{
int c;
while (c = *s++)
putc(c, iop);
return ferror(iop) ? EOF : 0;
}22. What specifies the minimum number of characters to print after being padded with zeros or blank spaces?
23. 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;
}
#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;
}24. What symbol is used to Left-justify within the data given field width?
25. 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);
}
#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);
}26. 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;
}
#include <stdio.h>
int main()
{
char n[] = "hello\nworld!";
char s[13];
sscanf(n, "%s", s);
printf("%s\n", s);
return 0;
}27. 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;
}
#include <stdio.h>
#include <ctype.h>
int main()
{
int i = 32;
if (isspace(i))
printf("space\n");
else
printf("not space\n");
return 0;
}28. 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);
}
#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);
}29. The functions vprintf(), vfprintf(), and vsprintf() are not equivalent to the corresponding printf() functions except the variable argument list.
30. Which is true about isalnum(c), where c is an int that can be represented as an unsigned?
char or EOF.isalnum(c) returns
char or EOF.isalnum(c) returnsRead More Section(File Input Output)
Each Section contains maximum 100 MCQs question on File Input Output. To get more questions visit other sections.