Standard Library Functions MCQs
Practice free Standard Library Functions multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 250 questions — no login required.
Question 28easy
What is the purpose of the 'isalpha' function in C?
Question 29easy
Which standard library function is used to open a file in C?
Question 30easy
What does the 'abs' function in C do?
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Question 31easy
The C library macro type . . . . . . . . retrieves the next argument in the parameter list of the function with type.
Question 32easy
What will be the output of the following C code?
char str[20];
strcpy(str, "123456");
res = atoi(str);
printf("%s %d\n", str, res);Question 33easy
MB_CUR_MAX is not defined in stdlib.h.
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Question 34easy
What is the type declared by the header file signal.h?
Question 35easy
The source filename and line number come from the preprocessor macros . . . . . . . . and . . . . . . . .
Question 36easy
What will the given C code do?
#include <stdlib.h>
_Mbsave_Mbxlen={0};
int (mblen)(const char *s ,size_t n)
{
return(_Mbtowc(NULL s,n,&_Mbxlen));
}