Question

In this Assignment assume that you have a text file with numbers separated by newlines. you want to read the numbers in and add them up. since we want to be flexible on the type and size of numbers we can handle, we will use double floating point.

Text file contains following numbers

8

3

6.5

9

0

assume that the files are well-formed: it will contain only valid numbers separated by newlines.

Using C language

Answer 1

Code in C:

#include<stdio.h>
#include<string.h>
int main()
{
   //Opening input.txt in read mode
   FILE *fp=fopen("input.txt","r");
   //If fp is null this means that failed to open file
   if(fp==NULL)
   {
       printf("Failed to open the file");
       return 0;
   }

   //Initialize a character array to store one line of file
   char num[500];
   //sum stores the final sum of number in file
   float sum=0;
   //Iterate over the file
   while(fgets(num,sizeof(num),fp)!=NULL)
   {
       //Covert string into float
       float x;
       sscanf(num, "%f", &x);
       //add x to sum
       sum=sum+x;
   }
   //close the file
   fclose(fp);
   //Print the result
   printf("Sum is: %f\n",sum);
   return 0;
}

output screenshot: