Question

please submit the C code( no third party library). the C code will create output to a file, and iterate in a loop 60 times and each iteration is 1 second, and if any key from your keyboard is pressed will write a 1 in the file, for every second no key is pressed, will write a 0 into the output file.

Answer 1

The following code is written in C language in which I have considered if any keyboard hit occurs in 1 second time period then we will write 1 in the output file but skip the remaining second. This is well explained in the comments.

// Library imported
#include<stdio.h> 
#include<string.h> 
#include<time.h> 
//Time delay function for 1 second delay
int delay(int number_of_seconds) 
{  
    clock_t start_time = clock(); 
    // 1000*number_of_seconds converts second to milliseconds
    // while loop will work for 1 second time period
    while (clock() < start_time + 1000 * number_of_seconds) 
        {
        // kbhit is used to check keyboard hits
                if(kbhit())
                {
                        char ch='\0';
                        ch=_getche();
                        //once keyboard button is pressed we take it as input
                        //  and store it in temporary varaible
                        // _getche is used to avoid pressing enter after some character
                        printf("\r\n");
                        // Just to make console screen proper previous line used
                        return 1;
                        // if any keyboard hits in 1 second peroid we will return 1
                }
                }
                return 0;
                // if no keyboard hit in 1 second peroid we will return 0
} 
  
int main( ) 
{ 

        FILE *filePointer ; 
        // declaring filePointer

        filePointer = fopen("output.txt", "w") ; 
        // opening file named output.txt it will always be empty in begining
        if ( filePointer == NULL ) 
        { 
           // if some exception occurs
                printf( "Failed to open" ) ; 
        } 
        else
        { 
                int i; 
                // 60 seconds loop start
        for (i = 0; i < 60; i++) { 
        printf("%d iteration\r\n",i+1);
        // printing every iteration so you can keep track on time 
        int s=delay(1);
                if(s==0){
        fputs("0", filePointer) ; 
        // write 0 in file if delay fn returns 0
        }
        else{
                fputs("1", filePointer) ; 
            // write 1 in file if delay fn returns 1
                }
         } 
                fclose(filePointer) ; 
                // close the file
                printf("End of the Code") ; 
                //end of the code
        } 
        return 0;                
} 

You can also change some part of code to make different implementations.  

If any doubts feel free to ask

Thanks