File Input Output — Part 2 MCQs with Explanations

Returns one argument & Steps va_list variable to the next is the correct answer to “Each call of va_arg . . . . . . . .”. This question is standard in competitive examination syllabi for File Input Output.

true is the correct answer to “setvbuf() and setbuf() function controls buffering for the stream.”. This question is standard in competitive examination syllabi for File Input Output.

d on the screen is the correct answer to “What will be the output of the following C code if following commands are used to run (considering myfile exists)? gcc -otest test.c ./test < myfile #include <stdio.h> int main() { char c = 'd'; putchar(c); }”. This question is standard in competitive examination syllabi for File Input Output.

not space is the correct answer to “What will be the output of the following C code? #include <stdio.h> #include <ctype.h> int main() { int i = 0; if (isspace(i)) printf("space\n"); else printf("not space\n"); return 0; }”. This question is standard in competitive examination syllabi for File Input Output.

False is the correct answer to “fputs() function writes a string to a file that only ends with a newline.”. This question is standard in competitive examination syllabi for File Input Output.

remove(const *filename) is the correct answer to “. . . . . . . . removes the named file, so that a subsequent attempt to open it will fail.”. This question is standard in competitive examination syllabi for File Input Output.

None of the mentioned is the correct answer to “Escape sequences are prefixed with . . . . . . . .”. This question is standard in competitive examination syllabi for File Input Output.

int is the correct answer to “What is the default return-type of getchar()”. This question is standard in competitive examination syllabi for File Input Output.

- means left justify, + means display the sign, 7 specifies the width and 2 specifies the precision is the correct answer to “Choose the correct description for control string %-+7.2f.”. This question is standard in competitive examination syllabi for File Input Output.

Non-zero number is the correct answer to “What will be the output of the following C code? #include <stdio.h> #include <ctype.h> int main() { char c = 't'; printf("is :%c\n", tolower('A')); }”. This question is standard in competitive examination syllabi for File Input Output.

to push a character back to file is the correct answer to “ungetc() is used . . . . . . . .”. This question is standard in competitive examination syllabi for File Input Output.

sqrt(x) is the correct answer to “Which mathematical function among the following does NOT require int parameters”. This question is standard in competitive examination syllabi for File Input Output.

strrchr(s, c) is the correct answer to “Which pre-defined function returns a pointer to the last occurence of a character in a string”. This question is standard in competitive examination syllabi for File Input Output.

2 is the correct answer to “Select the correct value of i from given options i=scanf("%d %d", &a, &b);”. This question is standard in competitive examination syllabi for File Input Output.

compile error is the correct answer to “What error will generate if the read and write parameters are not separated by commas”. This question is standard in competitive examination syllabi for File Input Output.

stdin and stdout is the correct answer to “gets() and puts() operate on . . . . . . . .”. This question is standard in competitive examination syllabi for File Input Output.

helloworld 0 is the correct answer to “What will be the output of the following C code? #include <stdio.h> int main() { char str[11] = "hello"; char *str1 = "world"; strcat(str, str1); printf("%s %d", str, str[10]); }”. This question is standard in competitive examination syllabi for File Input Output.

One is the correct answer to “Only . . . . . . . . character of pushback is guaranteed per file when ungetc is used.”. This question is standard in competitive examination syllabi for File Input Output.

Both connected to screen by default is the correct answer to “Which of the following statements about stdout and stderr are true”. This question is standard in competitive examination syllabi for File Input Output.

Print empty spaces if the string state is less than 10 characters is the correct answer to “What is the meaning of the following C statement? printf(“%10s”, state);”. This question is standard in competitive examination syllabi for File Input Output.

Somegarbage value is the correct answer to “What will be the output of the following C code? #include <stdio.h> int main() { short int i; scanf("%*d", &i); printf("%hd", i); return 0; }”. This question is standard in competitive examination syllabi for File Input Output.

The same deallocated memory location is the correct answer to “On freeing a dynamic memory, if the pointer value is not modified, then the pointer points to.”. This question is standard in competitive examination syllabi for File Input Output.

Pointer to n bytes of uninitialized storage is the correct answer to “void * malloc(size_t n) returns”. This question is standard in competitive examination syllabi for File Input Output.

It writes "Copying!" into the file pointed by fp is the correct answer to “What does the following segment of C code do? fprintf(fp, "Copying!");”. This question is standard in competitive examination syllabi for File Input Output.

int scanf(char *format, ...) is the correct answer to “Which of the following represents the function for scanf()”. This question is standard in competitive examination syllabi for File Input Output.

random() is the correct answer to “Which of the following can be used for random number generation”. This question is standard in competitive examination syllabi for File Input Output.

myworld(note: spaces to the left of myworld) is the correct answer to “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); }”. This question is standard in competitive examination syllabi for File Input Output.

The diagnostic output is directly displayed in the output is the correct answer to “What will be the output of the following C statement? fprintf(stderr, "error: could not open filen");”. This question is standard in competitive examination syllabi for File Input Output.

scanf is the correct answer to “Which among the following is the odd one out”. This question is standard in competitive examination syllabi for File Input Output.

[=%[width][modifiers]type=] is the correct answer to “The syntax of the scanf() is scanf("control string ", arg1,arg2,arg3,....,argn); the prototype of control string is”. This question is standard in competitive examination syllabi for File Input Output.

flags is the correct answer to “Output justification such as decimal point, numerical sign, trailing zeros or octal are specified.”. This question is standard in competitive examination syllabi for File Input Output.

False is the correct answer to “function fabs defined math.h header file takes the argument of type integer.”. This question is standard in competitive examination syllabi for File Input Output.

jkl is the correct answer to “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; }”. This question is standard in competitive examination syllabi for File Input Output.

None of the mentioned is the correct answer to “Which of the following is NOT a delimiter for an input in scanf”. This question is standard in competitive examination syllabi for File Input Output.

Both Non-zero if c is upper case & 0 if c is not upper case is the correct answer to “Which is true about isupper(c), where c is an int that can be represented as an unsigned? char or EOF.isupper(c) returns”. This question is standard in competitive examination syllabi for File Input Output.

87 is the correct answer to “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); }”. This question is standard in competitive examination syllabi for File Input Output.

False is the correct answer to “gets() function checks overflow run.”. This question is standard in competitive examination syllabi for File Input Output.

cc -lm filename.c is the correct answer to “In linux, apart from including math header file, the program is successfully executed by which of the following”. This question is standard in competitive examination syllabi for File Input Output.

digit is the correct answer to “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; }”. This question is standard in competitive examination syllabi for File Input Output.

45 is the correct answer to “What will be the output of the following C code? #include <stdio.h> #include <stdlib.h> int main() { FILE *fp = stdout; int n; fprintf(fp, "%d", 45); }”. This question is standard in competitive examination syllabi for File Input Output.