Explore topic-wise MCQs in Library Functions.

A preprocessor command

The source filename and line number come from the preprocessor macros________and______

mblen() function returns 0,if a null wide character was recognized. It returns -1 if an invalid multi-byte sequence was encountered.

C preprocessor

The library function clock() returns the number of _________ elapsed since the start of the program.

Some types and macros defined under the header file stddef.h may be defined under other header files too.

Select the function that reads or sets location dependent information.

The pointer used in the mblen() function points to the _________

The mbstowcs() function is used to return the number of array elements modified, not including a terminating zero code, if any.

MB_CUR_MAX is not defined in stdlib.h.

Which of the following is the correct code?

The header file assert.h of the C Standard Library defines ________macro.

The purpose of the function ctime() is that ___________

Which of the following is defined under the header file time.h?

Determine Output:

 #include #define a 10 void main() { #define a 50 printf("%d", a); }

Point out the error in the following program.

 #include int main() { char str[] = "IndiaBIX"; printf("%.#s %2s", str, str); return 0; }

Point out the error in the following program.

 #include #include int main() { char str1[] = "Learn through Compscibits 0.com", str2[120]; char *p; p = (char*) memccpy(str2, str1, 'i', strlen(str1)); *p = ' 0'; printf("%s", str2); return 0; }

What will be the output of the program?

 #include int main() { int i; char c; for(i=1; i<=5; i++) { scanf("%c", &c); /* given input is 'a' */ printf("%c", c); ungetc(c, stdin); } return 0; }

What will function gcvt() do?

What is the purpose of fflush() function ?

What is stderr ?

Which standard library function will you use to find the last occurrence of a character in a string in C?

The prototypes of all standard library string functions are declared in the file string.h.

scanf() or atoi() function can be used to convert a string like "436" in to integer.

The itoa function can convert an integer in decimal, octal or hexadecimal form to a string.

Will the program outputs "IndiaBIX.com"?

 #include #include int main() { char str1[] = "IndiaBIX.com"; char str2[20]; strncpy(str2, str1, 8); printf("%s", str2); return 0; }

If the two strings are found to be unequal then strcmp returns difference between the first non-matching pair of characters.

What will the function rewind() do?

Data written into a file using fwrite() can be read back using fscanf()

FILE is a structure suitably typedef'd in "stdio.h".

ftell() returns the current position of the pointer in a file stream.

What will be the output of the program?

 #include #include int main() { char dest[] = {97, 97, 0}; char src[] = "aaa"; int i; if((i = memcmp(dest, src, 2))==0) printf("Got it"); else printf("Missed"); return 0; }

What will be the output of the program?

 #include #include int main() { char *i = "55.555"; int result1 = 10; float result2 = 11.111; result1 = result1+atoi(i); result2 = result2+atof(i); printf("%d, %f", result1, result2); return 0; }

What will be the output of the program?

 #include int main() { int i; char c; for(i=1; i<=5; i++) { scanf("%c", &c); /* given input is 'b' */ ungetc(c, stdout); printf("%c", c); ungetc(c, stdin); } return 0; }

What will be the output of the program?

 #include int main() { int i; i = scanf("%d %d", &i, &i); printf("%d n", i); return 0; }

What will be the output of the program?

 #include #include<math.h> int main() { float i = 2.5; printf("%f, %d", floor(i), ceil(i)); return 0; }

Which of the given function differs from the statement errno is not neccessarily set on conversion error ?

______ macro must be called before using ______ and ________