what is standard input in c code example

Example 1: c input output

#include <stdio.h>
int main()
{
    int testInteger;
    printf("Enter an integer: ");
    scanf("%d", &testInteger);  
    printf("Number = %d",testInteger);
    return 0;
}

Example 2: fputs in c

#include <stdio.h>

int main () {
   FILE *fp;

   fp = fopen("file.txt", "w+");

   fputs("This is c programming.", fp);
   fputs("This is a system programming language.", fp);

   fclose(fp);
   
   return(0);
}