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.

#include <assert.h> 
#include <stdio.h>  
void main() 
{ 
   int n=12; 
   char str[50]="";
   assert(n >= 10); 
   printf(" output: %d\n", n); 
   assert(str != NULL); 
   printf("output: %s\n", str); 
}

double atan2 (double y, double x);