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C programs QnA

Q. If sum of two integer is 14 and if one of them is 8 then find other integer. Ans: Well, this is very simple. Simply, one integer is 8 and sum of two integers is 14. So, we need to subtract the number 8 from their sum of 14 to get the second number. So, the second number is: 14 - 8 = 6 C-Program of this task Code---> #include<stdio.h> int main () { int num1 = 8 , num2 , sum = 14 ; num2 = sum - num1 ; printf ( "The second number is: %d" , num2 ); return 0 ; }
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Write into a text-file(.txt) and again read the content(in Run-Time) using C-Language



In this C program we will Write some content into a text-file(.txt). Then, we will again open the text-file(.txt) in this same program and read the content entered by the user.

input:

The String or Content entered by the User.

output:

The content will be stored into the specified text-file(.txt) and the content of the text-file(.txt) will be printed on the screen.

CODE---->


#include<stdio.h>
#include<stdlib.h>
int main()
{
 FILE *fp,*fr;
 char s[80],ch;
 int i=0;
 fp=fopen("New File.txt","w");
 if(fp==NULL)
 printf("Unable to Open File.");
 else
 {
  printf("Please, Enter a String : ");
  fgets(s,sizeof(s),stdin);
  while(s[i]!='\0')
  {
   fputc(s[i],fp);
   i++;
  }
  printf("\n Your File has been saved.");
  fclose(fp);

 }
 printf("\n\n");
 fr=fopen("New File.txt", "r");
 if(fr==NULL)
 printf("unable to open File.");
 else
 {
  ch=fgetc(fr);
  while(ch!=EOF)
  {
   printf("%c",ch);
   ch=fgetc(fr);
  }
 }
 fclose(fr);
 return 0;
}

N.B. : In this C-Program the used text-file(.txt) and the C-Program file was stored in the same directory or path. So, if you want to open the text-file(.txt) stored in any other directory, path or folder, then, you have to declare the whole path or directory in the program.(i.e : fp=fopen("C:\\Users\\ADMIN\Desktop\\...the directory...\\file_name.txt")). The directory of a text-file(.txt) can be found by it's Property and if the text-file(.txt) is not created before Running the program, a file will be created in the specified path or folder with the name used in the program.
Don't just read, write it, run it.....

RESULT:


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